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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2018	Feb. 12, 2019	Jun. 30, 2018
Entity Information [Line Items]
Entity Registrant Name	LOUISIANA-PACIFIC CORP
Entity Central Index Key	0000060519
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		135,393,187
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 3,916,810,009

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 878.4	$ 928.0
Receivables, net of allowance for doubtful accounts of $0.8 million and $0.9 million at December 31, 2018 and 2017	127.6	142.5
Inventories	273.0	259.1
Prepaid expenses and other current assets	8.2	7.8
Current portion of notes receivable from asset sales	0.0	22.2
Total current assets	1,287.2	1,359.6
Timber and timberlands	62.4	55.7
Property, plant and equipment, net	1,010.4	926.1
Goodwill and other intangible assets	26.2	26.7
Investments in and advances to affiliates	49.4	7.8
Restricted cash	13.4	13.3
Other assets	61.2	56.8
Deferred tax asset	3.9	2.5
Total assets	2,514.1	2,448.5
LIABILITIES AND EQUITY
Current portion of long-term debt	5.0	25.1
Accounts payable and accrued liabilities	233.3	237.1
Income taxes payable	21.0	4.5
Current portion of contingency reserves	2.3	3.4
Total current liabilities	261.6	270.1
Long-term debt, excluding current portion	346.9	350.8
Deferred income taxes	62.2	33.4
Contingency reserves, excluding current portion	8.5	11.7
Other long-term liabilities	134.7	178.0
Stockholders' equity:
Preferred stock, $1 par value, 15,000,000 shares authorized, no shares issued	0.0	0.0
Common stock, $1 par value, 200,000,000 shares authorized, 153,358,542 shares issued	153.4	153.4
Additional paid-in capital	458.2	470.6
Retained earnings	1,612.6	1,280.1
Treasury stock, 16,525,351 shares and 8,462,949 shares, at cost	(377.6)	(177.5)
Accumulated comprehensive loss	(146.4)	(122.1)
Total stockholders' equity	1,700.2	1,604.5
Total liabilities and stockholders' equity	$ 2,514.1	$ 2,448.5

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 0.8	$ 0.9
Common Stock, Par or Stated Value Per Share	$ 1.00	$ 1.00
Common Stock, Shares Authorized	200,000,000	200,000,000
Common Stock, Shares, Issued	153,348,542	153,348,542
Common Stock, Shares, Outstanding	0	143,169,626
Preferred Stock, Par or Stated Value Per Share	$ 1.00	$ 1.00
Preferred Stock, Shares Authorized	15,000,000	15,000,000
Preferred Stock, Shares Issued	0	0
Treasury Stock, Shares	16,525,351	8,462,949

Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net sales	$ 2,828.0	$ 2,733.9	$ 2,233.4
Operating costs and expenses:
Cost of sales	2,084.0	1,998.1	1,829.1
Gross Profit	744.0	735.8	404.3
Selling and administrative	209.3	191.3	185.1
(Gain) loss on sale or impairment of long lived assets, net	10.8	6.8	(8.4)
Other operating credits and charges, net	(2.2)	4.9	17.4
Income from operations	526.1	532.8	210.2
Non-operating income (expense):
Interest expense, net of capitalized interest	(15.8)	(19.3)	(32.1)
Investment income	17.6	10.5	8.2
Other nonoperating items	(3.9)	(13.8)	(21.4)
Total non-operating income (expense)	(2.1)	(22.6)	(45.3)
Income from continuing operations before income taxes and equity in (income) loss of unconsolidated affiliates	524.0	510.2	164.9
Provision for income taxes	122.3	119.1	19.8
Equity in (income) loss of unconsolidated affiliates	2.9	0.0	(5.2)
Income from continuing operations	398.8	391.1	150.3
Loss from discontinued operations before taxes	(5.6)	(2.0)	(0.8)
Benefit for income taxes	(1.4)	(0.7)	(0.3)
Loss from discontinued operations	(4.2)	(1.3)	(0.5)
Net income	$ 394.6	$ 389.8	$ 149.8
Basic net income (loss) per share:
Income per share from continuing operations	$ 2.79	$ 2.71	$ 1.05
Loss per share from discontinued operations	(0.03)	(0.01)	(0.01)
Net income per share	2.76	2.70	1.04
Diluted net earnings (loss) per share:
Income per share from continuing operations	2.76	2.67	1.03
Loss per share from discontinued operations	(0.03)	(0.01)	0.00
Net income per share	$ 2.73	$ 2.66	$ 1.03
Weighted average number of shares outstanding - basic	143.0	144.4	143.4
Weighted average number of shares outstanding, diluted	144.4	146.4	145.3

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income	$ 394.6	$ 389.8	$ 149.8
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment	(17.3)	6.6	8.8
Unrealized gain (losses) on securities, net of reversals	0.1	0.8	(0.6)
Defined benefit pension and post retirement plans:
Change benefit obligations, translation adjustment	0.7	(0.4)	(0.5)
Net gain (loss)	2.3	2.5	(2.9)
Amortization of actuarial loss, net of tax	5.7	6.1	3.5
Amortization of prior service cost, net of tax	0.4	0.3	0.3
Other	0.5	(0.8)	0.3
Other comprehensive income (loss), net of tax	(7.6)	15.1	8.9
Comprehensive income	$ 387.0	$ 404.9	$ 158.7

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 394.6	$ 389.8	$ 149.8
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	120.0	123.3	112.8
Equity in (income) loss of unconsolidated affiliates, including dividends	3.3	(0.8)	1.5
Other operating credits and charges, net	2.2	4.9	17.4
(Gain) loss on sale or impairment of long-lived assets, net	10.8	6.8	(8.4)
Loss on early debt extinguishment	0.0	0.0	17.3
Stock-based compensation	8.6	9.7	13.0
Exchange (gain) loss on remeasurement	(1.1)	2.1	(2.0)
Cash settlements of warranty, net of accruals	(2.9)	(6.8)	(13.6)
Cash settlement of contingencies, net of accruals	(2.3)	(1.0)	(0.7)
Pension contributions	(41.1)	(12.8)	(7.0)
Pension expense	7.5	14.1	10.7
Other adjustments, net	1.2	1.5	3.4
(Increase) decrease in receivables	3.4	(35.0)	(8.9)
Increase in inventories	(1.9)	(22.7)	(11.0)
(Increase) decrease in prepaid expenses	(0.4)	(1.6)	1.0
Increase (decrease) in accounts payable and accrued liabilities	(20.7)	22.5	53.8
Increase (decrease) in income taxes payable or deferred income taxes	29.3	(20.3)	13.2
Net cash provided by operating activities	510.5	473.7	342.3
CASH FLOWS FROM INVESTING ACTIVITIES:
Property, plant, and equipment additions	(214.2)	(148.6)	(124.8)
Proceeds from asset sales	1.0	3.2	0.3
Acquisition of businesses, net of cash acquired	0.0	(20.8)	0.0
Investment in unconsolidated affiliates	(45.0)	0.0	0.0
Receipt of proceeds from notes receivable from asset sales	22.2	0.0	410.0
Payment of long-term deposit	0.0	(32.0)	0.0
Other investing activities, net	(2.2)	(0.4)	(0.4)
Net cash provided by (used in) investing activities	(238.2)	(198.6)	285.1
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	0.0	0.0	350.0
Repayment of long term debt	(24.7)	(2.6)	(742.5)
Payment of debt issuance fees	0.0	(0.5)	(5.2)
Payment of cash dividends	(74.4)	0.0	0.0
Purchase of treasury stock	(211.8)	0.0	0.0
Taxes paid related to net share settlement of equity awards	(9.3)	(5.9)	(9.2)
Other financing activities, net	3.2	(0.4)	(0.1)
Net cash used in financing activities	(317.0)	(9.4)	(407.0)
Effect of exchange rate on cash, cash equivalents and restricted cash	(4.8)	3.1	3.1
Net increase (decrease) in cash, cash equivalents and restricted cash	(49.5)	268.8	223.5
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 891.8	$ 941.3	$ 672.5

Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Comprehensive Loss [Member]
Balance, Beginning at Dec. 31, 2015	$ 1,017.0	$ 153.0	$ (210.6)	$ 496.5	$ 724.2	$ (146.1)
Balance, Beginning, Shares at Dec. 31, 2015		153,000,000	10,000,000
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	15.9			(0.4)	16.3
Net income	149.8				149.8
Payment of cash dividends	0.0
Issuance of shares for employee stock plans and stock-based compensation			(1,500,000)
Issuance of shares for employee stock plans and stock-based compensation, amount	(0.4)		$ (30.8)	(30.4)
Exercise of stock warrants, shares		400,000
Exercise of stock warrants, amount	0.0	$ 0.4		(0.4)
Compensation expense associated with stock awards	12.9			12.9
Taxes paid related to net settlement of equity awards, shares			500,000
Taxes paid related to net share settlement of equity awards	(9.2)		$ (9.2)
Other comprehensive loss	8.9					8.9
Balance, Ending, Shares at Dec. 31, 2016		153,400,000	9,000,000
Balance, Ending at Dec. 31, 2016	1,195.7	$ 153.4	$ (189.0)	478.2	890.3	(137.2)
Net income	389.8				389.8
Payment of cash dividends	0.0
Issuance of shares for employee stock plans and stock-based compensation			(900,000)
Issuance of shares for employee stock plans and stock-based compensation, amount	(0.6)		$ (17.7)	(17.1)
Compensation expense associated with stock awards	9.5			9.5
Taxes paid related to net settlement of equity awards, shares			300,000
Taxes paid related to net share settlement of equity awards	(5.9)		$ (6.2)
Adjustments Related to Tax Withholding for Share-based Compensation	6.2
Other comprehensive loss	$ 15.1					15.1
Balance, Ending, Shares at Dec. 31, 2017	143,169,626	153,400,000	8,400,000
Balance, Ending at Dec. 31, 2017	$ 1,604.5	$ 153.4	$ (177.5)	470.6	1,280.1	(122.1)
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	(4.4)				12.3	(16.7)
Net income	394.6
Payment of cash dividends	(74.4)				(74.4)
Issuance of shares for employee stock plans and stock-based compensation			(1,000,000)
Issuance of shares for employee stock plans and stock-based compensation, amount	0.0		$ (21.0)	(21.0)
Treasury Stock, Shares, Acquired			8,600,000
Treasury Stock, Value, Acquired, Cost Method	(211.8)		$ (211.8)
Compensation expense associated with stock awards	8.6			8.6
Taxes paid related to net settlement of equity awards, shares			500,000
Taxes paid related to net share settlement of equity awards	(9.3)		$ (9.3)
Other comprehensive loss	$ (7.6)					(7.6)
Balance, Ending, Shares at Dec. 31, 2018	0	153,400,000	16,500,000
Balance, Ending at Dec. 31, 2018	$ 1,700.2	$ 153.4	$ (377.6)	$ 458.2	$ 1,612.6	$ (146.4)

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2018

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]

Significant Accounting Policies [Text Block]


1.	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of Operations

Louisiana-Pacific Corporation and our subsidiaries are a leading provider of high-performance building solutions. We design, manufacture and market a broad range of products for the new home construction, repair and remodeling and outdoor structures markets. In addition to our U.S. operations, the Company also maintains manufacturing facilities in Canada, Chile and Brazil through foreign subsidiaries and joint ventures. The principal customers for our building products are retail home centers, manufactured housing producers, distributors and wholesalers in North America and South America, with limited sales to Asia, Australia and Europe. References to "LP", "the Company", "we", "our" and "us" refers to Louisiana-Pacific Corporation and its consolidated subsidiaries as a whole.

See Note 24 below for further information regarding our products and segments.

Use of Estimates in the Preparation of Financial Statements

The preparation of financial statements in conformity with accounting principles generally accepted in the U.S. requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Consolidation

The consolidated financial statements include the accounts of LP and our majority-owned subsidiaries. All intercompany transactions, profits and balances have been eliminated.

Cash and Cash Equivalents

Cash and cash equivalents includes cash on hand and short-term investments of 3 months or less when purchased. These investments are stated at cost, which approximates market value.

Investments

Our long-term investments are classified as available-for-sale and are reported at estimated fair value. Unrealized gains and losses, net of tax, on these investments are reported as a separate component of “Accumulated comprehensive loss” in Stockholders’ Equity until realized. Impairment losses are charged to income for other-than-temporary declines in fair value. Realized gains and losses (including impairments) are recorded in “Investment income” in the Consolidated Statements of Income. For purposes of computing realized gains and losses, cost is identified on a specific identification basis. See Note 4 for further discussion.

Fair Value of Financial Instruments

We have, where appropriate, estimated the fair value of financial instruments. These fair value amounts may be significantly affected by the assumptions used, including the discount rate and estimates of cash flows. Accordingly, the estimates presented are not necessarily indicative of the amounts that could be realized in a current market exchange.

Inventory

Inventories are valued at the lower of cost or net realizable value. Inventory costs include materials, labor and operating overhead. The LIFO (last-in, first-out) method is used for a minor portion of our log inventories with the remaining inventories valued at FIFO (first-in, first-out) or average cost. Included in the inventory balance as of December 31, 2018 is a valuation allowance of $10.9 million. Inventory consists of the following:



	December 31,
Dollar amounts in millions	2018		2017
Logs	$	56.9	$	60.3
Other raw materials	24.8		20.8
Semi finished inventory	23.4		24.3
Finished products	167.9		153.7
Total	$	273.0	$	259.1

Timber and Timberlands

Timber and timberlands is comprised of timber deeds and allocations of purchase price to Canadian timber harvesting licenses. Timber deeds are transactions in which we purchase timber, but not the underlying land. The cost of timber deeds are capitalized in timber and timberlands and charged to cost of timber harvested as the volume is removed. Timber that has been severed but has not yet been delivered to a facility is included in timber and timberlands. The values associated with timber licenses were allocated in the purchase price allocations for Le Groupe Forex (Forex), Peace Valley OSB, and the assets of Evans Forest Products. These licenses have a life of twenty to twenty-five years. These licenses are amortized on a straight-line basis over the life of the facilities. See Note 8 for further discussion.

Canadian timber harvesting licenses also include future requirements for reforestation. The fair value of the future estimated reforestation obligation is accrued and recognized in cost of sales on the basis of the volume of timber harvested; fair value is determined by discounting the estimated future cash flows using a credit adjusted risk-free rate. Subsequent changes to fair value resulting from the passage of time and revisions to fair value calculations are recognized in earnings as they occur.

Property, Plant and Equipment

Property, plant and equipment, including capitalized interest, are recorded at cost. Depreciation is principally calculated by the units of production method for machinery and equipment which amortizes the cost of equipment over the estimated units that will be produced during its useful life. Provisions for depreciation of buildings, land improvements and the remaining machinery and equipment have been computed using straight-line rates based on the estimated service lives. The effective straight-line lives for the principal classes of property range from three to twenty years. Depreciation expense can be attributed to Cost of sales and Selling and administrative as noted below:



Dollar amounts in millions	Years ended December 31,
Dollar amounts in millions	2018		2017		2016
Cost of sales	$	116.8	$	120.1	$	109.6
Selling and administrative	3.2		3.2		3.2
Total depreciation and amortization	$	120.0	$	123.3	$	112.8

Logging road construction costs are capitalized and included in land and land improvements. These costs are amortized as the timber volume adjacent to the road system is harvested.

We capitalize interest on borrowed funds during construction periods. Capitalized interest is charged to and amortized over the lives of the related assets. Capitalized interest totaled $4.0 million in 2018 and $2.2 million 2017.

Plant, property and equipment, net consists of the following:



Dollar amounts in millions	December 31,
Dollar amounts in millions	2018			2017
Property, plant and equipment, at cost:
Land, land improvements and logging roads, net of road amortization	$	168.6		$	162.7
Buildings	329.9			347.5
Machinery and equipment	1,949.0			1,977.4
Construction in progress	148.1			98.5
	2,595.6			2,586.1
Accumulated depreciation	(1,585.2		)	(1,660.0		)
Property, plant and equipment, net	$	1,010.4		$	926.1

Potential Impairments

Long-lived assets to be held and used by us (primarily property, plant and equipment and timber and timberlands) are reviewed for impairment when events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. When impairment is indicated, the book values of the assets are written down to their estimated fair value as calculated by the expected discounted cash flow or estimated net sales price. See Note 17 for a discussion of charges in 2018, 2017 and 2016 related to impairments of property, plant and equipment. Long-lived assets that are held for sale are written down to the estimated sales proceeds less cost to sell unless the estimated net proceeds exceed the carrying value.

Goodwill and Intangible assets

Goodwill is tested for impairment on an annual basis, and when indicators of impairment are determined to exist. Impairment is evaluated by applying a fair value based test. Impairment losses would be recognized whenever the implied fair value of goodwill is less than its carrying value. Intangible assets with finite useful lives are amortized generally on a straight-line basis over the periods benefited. Impairment of the intangible asset is evaluated when factors indicate impairment may exist. See Note 8 for further discussion.

Investments in Affiliates

LP accounts for investments in affiliates when LP does not have a controlling financial interest using the equity method under which LP’s share of earnings and losses of the affiliate is reflected in earnings and dividends are credited against the investment in affiliate when declared. See Note 9 for further discussion.

Restricted Cash

Our restricted cash accounts generally secure outstanding letters of credit.

Income Taxes

We account for income taxes under an asset and liability approach that requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in our financial statements or tax returns. In estimating future tax consequences, we generally consider all expected future events other than the enactment of changes in tax laws or rates. The effect on deferred tax assets and liabilities of a change in tax rates will be recognized as income or expense in the period that includes the enactment date. Additionally, deferred tax assets are reduced by a valuation allowance when it is more likely than not that some portion of the deferred tax assets will not be realized.

We recognize liabilities for uncertain tax positions through a two-step process. The first step is to evaluate the tax position for recognition by determining if the weight of the available evidence indicates that it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation process, if any. The second step requires us to estimate and measure the tax benefit as the largest amount that is more than 50% likely to be realized upon ultimate settlement. It is inherently difficult and subjective to estimate such amounts, as LP must determine the probability for various outcomes. LP evaluates these uncertain tax provisions when new information becomes available. These revaluations are based upon factors including, but not limited to, changes in circumstances, changes in tax law, successful settlement of issues under audit and new audit activity. Such a change in recognition or measurement could result in the recognition of a tax benefit or an increase to the related provision.

We classify interest related to income taxes liabilities or uncertain tax positions as interest expense or interest income and, if applicable, penalties are recognized as a component of income tax expense.

See Note 11 for further discussion of deferred income taxes.

Asset Retirement Obligations

We record the fair value of the legal and conditional obligations to retire and remove long-lived assets in the period which the obligation is incurred. These obligations primarily consist of monitoring costs on closed landfills, timber reforestation obligations associated with LP’s timber licenses in Canada and site restoration costs. When the related liability is initially recorded, we capitalize the cost by increasing the carrying amount of the related long-lived asset. Over time, the liability is accreted to its settlement value and the capitalized cost is depreciated over the useful life of the related asset. Upon settlement of the liability, we recognize a gain or loss for any difference between the settlement amount and the liability recorded. See Note 15 for further discussion.

Stock-Based Compensation

We recognize the cost of employee services received in exchange for awards of equity instruments, such as performance shares, restricted stock or restricted stock units and stock-settled stock appreciation rights (SSARs), based upon the fair value of those awards at the date of grant over the requisite service period. See Note 14 for further discussion.

Foreign Currency Translation

The functional currency for our Canadian subsidiaries is the U.S. dollar; however, the books and records for these subsidiaries are maintained in the Canadian dollar. The financial statements of these foreign subsidiaries are remeasured into U.S. dollars using the historical exchange rate for property, plant and equipment, timber and timberlands (related depreciation and amortization on both property, plant and equipment and timber and timberlands), goodwill, and certain other non-monetary assets.We use the exchange rate at the balance sheet date for the remaining assets and liabilities, including deferred taxes. A weighted-average exchange rate is used for each period for revenues and expenses. These transaction gains or losses are recorded in “Other non-operating income (expense)” on the Consolidated Statements of Income.

The functional currencies of our Argentinean, Brazilian, Chilean, Columbian and Peruvian subsidiaries is the local currency and therefore their books and records are maintained in the local currency. Translation adjustments, which are based upon the exchange rate at the balance sheet date for assets and liabilities and the weighted-average rate for the income statement, are recorded in “Accumulated comprehensive income (loss)” in Stockholders’ equity.

Advertising costs

Advertising costs, which amounted to $21.3 million, $19.1 million and $19.6 million in 2018, 2017 and 2016, are principally expensed as incurred. Advertising costs include product displays, media production costs, agency fees, sponsorships and cooperating advertising.

Other Operating Credits and Charges, Net

We classify significant amounts unrelated to ongoing core operating activities as “Other operating credits and charges, net” in the Consolidated Statements of Income. Such items include, but are not limited to, amounts related to restructuring charges (including severance charges), charges to establish and maintain litigation or environmental reserves, product reserves, prior year adjustments, retirement charges and gains or losses from settlements with governmental or other organizations. Due to the nature of these items, amounts in the income statement can fluctuate from year to year. The determination of which items are considered significant and unrelated to core operations is based upon management’s judgment. See Note 16 for a discussion of specific amounts in 2018, 2017 and 2016.

Retirement Benefits

We are required to use actuarial methods and assumptions in the valuation of defined benefit obligations and the determination of expense. Difference between actual and expected results or changes in the values of the obligations and plan assets are not recognized in earnings as they occur but, rather, systematically and gradually over subsequent periods. See Note 22 for further information.

Comprehensive Income

Comprehensive income consists of net income (loss) and other gains and losses affecting shareholders’ equity that are excluded from net income (loss), including foreign currency translation adjustments, costs associated with pension or other post retirement benefits that have not been recognized as components of net periodic benefit costs, and net unrealized gains or losses on securities and is presented in the accompanying Consolidated Statements of Comprehensive Income. See Note 23 for further discussion.

Present and Prospective Accounting Pronouncements (Notes)	12 Months Ended
	Dec. 31, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	Accounting Standards Issued But Not Yet Adopted In March 2016, the Financial Accounting Standards Board (FASB) issued ASU 2016-02, "Leases (Topic 842)", which supersedes the lease accounting requirements in ASC Topic 840, "Leases". The new standard requires entities to recognize, separately from each other, an asset for its right to use (ROU) the underlying asset equal to the liability for its finance and operating lease obligations. Further, the entity is required to present separately the current and non-current portion of the ROU asset and corresponding lease liability. In July 2018, the FASB issued ASU 2018-10, "Codification Improvements to Topic 842, Leases", which clarifies certain aspects of the new lease standard. The amendments in this ASU address the rate implicit in the lease, impairment of the net investment in the lease, lessee reassessment of lease classification, lessor reassessment of lease term and purchase options, variable payments that depend on an index or rate and certain transition adjustments, among other things. In July 2018, the FASB issued ASU 2018-11, "Leases (Topic 842) Targeted Improvements", which provides an additional (and optional) transition method whereby the new lease standard is applied at the adoption date and recognized as an adjustment to retained earnings. The amendments have the same effective date and transition requirements as the new lease standard. We will adopt the standard on January 1, 2019, using this optional transition method and plan to elect all practical expedients. We do not expect the adoption of this new standard to have a material impact on our consolidated results of operations and financial position. In October 2016, the FASB issued ASU 2016-16, "Income Taxes (Topic 740), Intra-Entity Transfers of Assets Other Than Inventory." The standard provides guidance that entities recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. Consequently, the amendments eliminate the exception for an intra-entity transfer of an asset other than inventory. The new standard is effective for annual reporting periods beginning after December 15, 2018, and interim reporting periods within annual periods beginning after December 15, 2019. Early adoption is permitted for all entities as of the beginning of an annual reporting period for which financial statements (interim or annual) have not been issued or made available for issuance. We do not expect the adoption of this new standard to have a material impact on our consolidated results of operations and financial position. In January 2017, the FASB issued ASU 2017-04, "Intangibles—Goodwill and Other (Topic 350)". The standard simplifies the accounting for goodwill impairments by eliminating step 2 from the goodwill impairment test. Instead, if the carrying amount of a reporting unit exceeds its fair value, an impairment loss shall be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. The new standard is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. We do not expect the adoption of this new standard to have a material impact on our consolidated results of operations and financial position. In August 2018, the FASB issued ASU 2018-13, "Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement", which amends ASC 820 to add and remove disclosure requirements related to fair value measurement. The amendments include new disclosure requirement for changes in unrealized gains or losses included in Other Comprehensive Income (OCI) for recurring Level 3 fair value measurements held at the end of the reporting period and the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. The amendments eliminated disclosure requirements for amount of and reasons for transfers between Level 1 and Level 2, valuation processes for Level 3 fair value measurements, and policy for timing of transfers between levels of the fair value hierarchy. In addition, the amendments modified certain disclosure requirement to provide clarification or to promote appropriate exercise of discretion by entities. ASU 2018-13 is effective for fiscal years beginning after December 15, 2019, including interim periods therein. Early adoption is permitted. We are currently evaluating the impact that the adoption of this guidance will have on our financial statements and related disclosures. In August 2018, the FASB issued ASU 2018-14, "Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans", which amends ASC 715 to add, remove, and clarify disclosure requirements related to defined benefit pension and other postretirement plans. The amended guidance modifies the disclosure requirements for employers that sponsor defined benefit pension or other post-retirement plans by removing and adding certain disclosures for these plans. The eliminated disclosures include (a) the amounts in accumulated OCI expected to be recognized in net periodic benefit costs over the next fiscal year, and (b) the effects of a one percentage point change in assumed health care cost trend rates on the net periodic benefit costs and the benefit obligation for post-retirement health care benefits. Additional disclosures include descriptions of significant gains and losses affecting the benefit obligation for the period. The amended guidance is effective for fiscal years ending after December 15, 2020. Early adoption is permitted. The adoption of this guidance will modify our disclosures but will not have a material effect on our consolidated financial statements. In August 2018, the FASB issued ASU 2018-15, "Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract", which provides additional guidance on the accounting for costs of implementation activities performed in a cloud computing arrangement that is a service contract. The amendments require an entity in such arrangements to account for implementation costs in the same manner as internal-use software as outlined in ASC 350. The amended guidance is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted. We are currently evaluating the impact that the adoption of this guidance will have on our financial statements and related disclosures.

Revenue (Notes)

12 Months Ended

Dec. 31, 2018

Disaggregation of Revenue [Line Items]

Revenue from Contract with Customer [Text Block]

3. REVENUE

Revenue is recognized when obligations under the terms of a contract (purchase orders) with our customers are satisfied; generally, this occurs with the transfer of control of our products. Revenue is measured as the amount of consideration we expect to receive in exchange for transferring goods. Shipping cost incurred by us to deliver products to our customers are recorded in cost of sales. The expected costs associated with our warranties continue to be recognized as expense when the products are sold. We recognize revenue as of a point in time.

During 2018, 2017 and 2016, LP's top ten customers accounted for approximately 44%, 46% and 41% of its sales in the aggregate. No individual customer exceeded 10% of LP's sales in 2018, 2017 or 2016.

Customer programs and incentives are a common practice in our businesses. Our businesses incur customer program costs to obtain favorable product placement, to promote sales of products and to maintain competitive pricing. Customer program costs and incentives, including rebates and promotion and volume allowances, are accounted for as deductions from net sales at the time the program is initiated. These reductions from revenue are recorded at the later of the time of sale or the implementation of the program based on management’s best estimates. Estimates are based on historical and projected experience for each type of program or customer. Volume allowances are accrued based on management’s estimates of customer volume achievement and other factors incorporated into customer agreements, such as new product purchases, store sell-through and merchandising support. Management periodically reviews accruals for these rebates and allowances, and adjusts accruals when circumstances indicate (typically as a result of a change in volume expectations). As of December 31, 2018 and 2017; we had $30.1 million and $24.2 million accrued as customer rebates recorded in Accounts payable and accrued liabilities on our Consolidated Balance Sheets.

We ship some of our products to customers' distribution centers on a consignment basis. We retain title to our products stored at the distribution centers. As our products are removed from the distribution centers by retailers and shipped to retailers’ stores, title passes from us to the retailers. At that time, we invoice the retailers and recognize revenue for these consignment transactions. We do not offer a right of return for products shipped to the retailers’ stores from the distribution centers. The amount of consignment inventory as of December 31, 2018 and 2017 was $9.5 million and $18.3 million.

The following tables disaggregate our revenue by product line and product type by segment for the years ended December 31:



Year Ended December 31, 2018
By Product family:	Siding		OSB		EWP		South America		Other		Inter-segment			Total
SmartSide^® Strand siding	$	724.8	$	—	$	—	$	21.5	$	—	$	—		$	746.3
SmartSide^® Fiber siding	106.4		—		—		—		—		—			106.4
CanExel^® siding	37.3		—		—		—		—		—			37.3
OSB - commodity	39.4		746.0		9.9		—		—		(0.1		)	795.2
OSB - value-add	22.5		550.9		13.9		135.2		—		—			722.5
LVL	—		—		140.9		—		—		—			140.9
LSL	—		—		59.2		—		—		—			59.2
I-joist	—		—		122.1		—		—		—			122.1
Plywood	—		—		28.7		—		—		—			28.7
Other	11.9		8.3		16.2		4.1		28.9		—			69.4
	$	942.3	$	1,305.2	$	390.9	$	160.8	$	28.9	$	(0.1	)	$	2,828.0
By Product type:
Commodity	$	39.4	$	746.0	$	38.6	$	—	$	—	$	(0.1	)	$	823.9
Value-add	891.0		550.9		336.1		156.7		—		—			1,934.7
Other	11.9		8.3		16.2		4.1		28.9		—			69.4
	$	942.3	$	1,305.2	$	390.9	$	160.8	$	28.9	$	(0.1	)	$	2,828.0



Year Ended December 31, 2017
By Product family:	Siding		OSB		EWP		South America		Other		Inter-segment			Total
SmartSide^® Strand siding	$	646.3	$	—	$	—	$	19.7	$	—	$	(3.6	)	$	662.4
SmartSide^® Fiber siding	111.3		—		—		—		—		—			111.3
CanExel^® siding	49.4		—		—		—		—		—			49.4
OSB - commodity	66.9		765.5		9.4		—		—		—			841.8
OSB - value-add	—		524.7		13.2		131.7		—		—			669.6
LVL	—		—		144.3		—		—		—			144.3
LSL	—		—		46.8		—		—		(0.1		)	46.7
I-joist	—		—		116.9		—		—		(0.1		)	116.8
Plywood	—		—		25.1		—		—		—			25.1
Other	10.1		12.3		10.2		3.9		30.0		—			66.5
	$	884.0	$	1,302.5	$	365.9	$	155.3	$	30.0	$	(3.8	)	$	2,733.9
By Product type:
Commodity	$	66.9	$	765.5	$	34.5	$	—	$	—	$	—		$	866.9
Value-add	807.0		524.7		321.2		151.4		—		(3.8		)	1,800.5
Other	10.1		12.3		10.2		3.9		30.0		—			66.5
	$	884.0	$	1,302.5	$	365.9	$	155.3	$	30.0	$	(3.8	)	$	2,733.9



Year Ended December 31, 2016
By Product family:	Siding		OSB		EWP		South America		Other		Inter-segment			Total
SmartSide^® Strand siding	$	549.5	$	—	$	—	$	19.6	$	—	$	(1.5	)	$	567.6
SmartSide^® Fiber siding	108.1		—		—		—		—		—			108.1
CanExel^® siding	43.2		—		—		—		—		—			43.2
OSB - commodity	40.8		626.0		0.1		—		—		(5.8		)	661.1
OSB - value-add	1.8		390.3		10.7		112.3		—		—			515.1
LVL	—		—		122.1		—		—		—			122.1
LSL	—		—		37.8		—		—		—			37.8
I-joist	—		—		99.4		—		—		—			99.4
Plywood	—		—		15.8		—		—		—			15.8
Other	8.9		11.4		11.0		5.0		26.9		—			63.2
	$	752.3	$	1,027.7	$	296.9	$	136.9	$	26.9	$	(7.3	)	$	2,233.4
By Product type:
Commodity	$	40.8	$	626.0	$	15.9	$	—	$	—	$	(5.8	)	$	676.9
Value-add	702.6		390.3		270.0		131.9		—		(1.5		)	1,493.3
Other	8.9		11.4		11.0		5.0		26.9		—			63.2
	$	752.3	$	1,027.7	$	296.9	$	136.9	$	26.9	$	(7.3	)	$	2,233.4

Investments

12 Months Ended

Dec. 31, 2018

Investments [Abstract]

Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]

INVESTMENTS

Long-term investments held by us are debt securities designated as available for sale and are reported at fair market value using the specific identification method. The following table summarizes unrealized gains and losses related to these investments as of December 31, 2018 and December 31, 2017:



Dollar amounts in millions	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
December 31, 2018	$	0.4	$	5.7	$	—	$	6.1

December 31, 2017	$	0.4	$	5.6	$	—	$	6.0

As of December 31, 2018, we had $6.1 million ($19.3 million, par value) invested in auction rate securities (ARS). The ARS held by us are securities with long-term nominal maturities for which the interest rates may be reset through a Dutch auction each month. Our investments in ARS represent interests in collateralized debt obligations supported by pools of residential and commercial mortgages and other securities. The contractual maturities of these debt securities classified as available for sale at December 31, 2018 exceed one year.

During 2018, we received a return of principal on our ARS of $0.4 million. We recorded a gain on securities of $0.4 million, which represents a recovery of losses previously recorded as "Other-than-temporary impairment."

There were no purchases of short-term and long-term investments for the years ended December 31, 2018 and 2017. During 2018 and 2017, we did not own any short-term investments.

Fair Value Measurements

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

FAIR VALUE MEASUREMENTS

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. We are required to classify these financial assets and liabilities into two groups: recurring—measured on a periodic basis and non-recurring—measured on an as needed basis.

There are three levels of inputs that may be used to measure fair value:


Level 1	Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.


Level 2	Quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in inactive markets; or valuations based on models where the significant inputs are observable or can be corroborated by observable market data.


Level 3	Valuations based on models where significant inputs are not observable. Unobservable inputs are used when little or no market data is available and reflect the Company’s own assumptions about the assumptions market participants would use.

Assets and liabilities measured at fair value on a recurring basis as of December 31, 2018 and 2017 is summarized in the following tables.



Dollar amounts in millions	December 31, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Available for sale securities	$	6.1	$	—	$	—	$	6.1
Trading securities	3.1		3.1		—		—



Dollar amounts in millions	December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Available for sale securities	$	6.0	$	—	$	—	$	6.0
Trading securities	3.1		3.1		—		—

Due to the lack of observable market quotations on a portion of our ARS portfolio, we evaluate the structure of our ARS holdings and current market estimates of fair value, including fair value estimates from banks that rely exclusively on Level 3 inputs. These inputs include those that are based on expected cash flow streams and collateral values, including assessments of counterparty credit quality, default risk underlying the security, discount rates and overall capital market liquidity. The valuation of our ARS investment portfolio is subject to uncertainties that are difficult to predict. Factors that may impact our valuation include changes to credit ratings of the securities as well as to the underlying assets supporting those securities, rates of default of the underlying assets, underlying collateral value, discount rates, counterparty risk and ongoing strength and quality of market credit and liquidity.

Trading securities consist of rabbi trust financial assets which are recorded in other assets in our consolidated balance sheets. The rabbi trust holds assets attributable to the elections of certain management employees to defer the receipt of a portion of their compensation. The assets of the rabbi trust are invested in mutual funds and are reported at fair value based on active market quotations, which represent Level 1 inputs.

The following table summarizes changes in assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the twelve months ended December 31, 2018 and 2017.



Dollar amounts in millions	Available for sale securities
Balance at December 31, 2016	$	4.8
Total realized/unrealized gains
Included in other comprehensive income	1.2
Balance at December 31, 2017	$	6.0
Return of principal on ARS	0.4
Total realized/unrealized gains
Included in investment income	(0.4		)
Included in other comprehensive income	0.1
Balance at December 31, 2018	$	6.1

Carrying amounts reported on the balance sheet for cash and cash equivalents, receivables and accounts payable approximate fair value due to the short-term maturity of these instruments. See discussion on fair market values for Long-term Debt included within Note 13.

We review the carrying values of long-lived assets to be held and used for impairment wherever events or changes in circumstances indicate possible impairment. An impairment loss is recognized when a long-lived asset's carrying value is not recoverable (given assumptions on housing starts and growth rates) and exceeds estimated fair value.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Earnings Per Share (Notes)

12 Months Ended

Dec. 31, 2018

Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]

Earnings Per Share [Text Block]

Basic earnings per share are based on the weighted-average number of shares of common stock outstanding. Diluted earnings per share are based upon the weighted-average number of shares of common stock outstanding plus all potentially dilutive securities that were assumed to be converted into common shares at the beginning of the period under the treasury stock method. This method requires that the effect of potentially dilutive common stock equivalents (stock options, stock settled stock appreciation rights (SSARs), restricted stock or units, performance shares and warrants) be excluded from the calculation of diluted earnings per share for the periods in which losses from continuing operations are reported because the effect is anti-dilutive. The following table sets forth the computation of basic and diluted earnings per share:



	Year ended December 31,
Share amounts in millions	2018	2017	2016
Denominator for basic earnings per share:
Weighted average common shares outstanding	143.0	144.4	143.4
Effect of dilutive securities:
Dilutive effect of employee stock plans	1.4	2.0	1.7
Dilutive effect of stock warrants	—	—	0.2
Dilutive potential common shares	1.4	2.0	1.9
Denominator for diluted earnings per share:
Adjusted weighted average shares	144.4	146.4	145.3

For the year ended December 31, 2018, there were no SSARs that were considered not in-the-money for purposes of our earnings per share calculation.

For the years ended December 31, 2017 and 2016, SSARS relating to approximately 0.2 million and 2.6 million common shares were considered not in-the-money for purposes of our earnings per share calculation.

Receivables

12 Months Ended

Dec. 31, 2018

Receivables [Abstract]

Receivables

RECEIVABLES

Receivables consist of the following:



	December 31,
Dollar amounts in millions	2018			2017
Trade receivables	$	86.7		$	124.6
Income tax receivable	16.3			2.2
Other receivables	25.4			16.6
Allowance for doubtful accounts	(0.8		)	(0.9		)
	$	127.6		$	142.5

Other receivables at December 31, 2018 and 2017 primarily consist of sales tax receivables, vendor rebates, interest receivables, a receivable associated with an affiliate and other miscellaneous receivables.

Additionally, as of December 31, 2017, we had $22.2 million recorded as notes receivable from asset sales related to a transaction that occurred during 1998. The note receivable provided collateral for our limited recourse note payable (see Note 13). This receivable was collected during 2018 and the associated limited recourse note payable matured and was paid.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2018

Other Intangible Assets [Abstract]

Intangible Assets Disclosure [Text Block]

GOODWILL AND OTHER INTANGIBLE ASSETS

Changes in goodwill and other intangible assets for the year ended December 31, 2018 and 2017 are provided in the following table:



Dollar amounts in millions	2018											2017
	Timber and timberlands			Goodwill		Developed Technology			Total			Timber and timberlands			Goodwill		Developed Technology			Total
Beginning balance December 31,	$	43.9		$	16.1	$	10.6		$	70.6		$	47.1		$	9.7	—			$	56.8
Additions	—			—		—			—			—			6.4		11.0			17.4
Amortization	(3.2		)	—		(0.5		)	(3.7		)	(3.2		)	—		(0.4		)	(3.6		)
Total goodwill and other intangibles	$	40.7		$	16.1	$	10.1		$	66.9		$	43.9		$	16.1	$	10.6		$	70.6

Included in the balance of timber and timberlands are values allocated to Canadian forest licenses in the purchase price allocations for Forex, Peace Valley OSB, and the assets of Evans Forest Products. The initial value of these licenses was $91.3 million and are amortized over the estimated useful life of twenty to twenty-five years.

During 2017, we purchased the stock of Barrier International, Inc. for $22.0 million (including cash acquired). This purchase results in us recording intangible assets of $17.4 million (comprised of $11.0 million of developed technology and $6.4 million of goodwill) based upon an independent appraisal. The developed technology will be amortized over a 20 year period.

Amortization of the above intangible assets over the next five years is as follows:



Dollar amounts in millions
Year ended December 31,
2019	$	3.8
2020	3.8
2021	3.8
2022	3.8
2023	3.8

Investments in and Advances to Affiliates	12 Months Ended
Investments in and Advances to Affiliates	Dec. 31, 2018
Related Party Transactions [Abstract]
Transactions with Affiliates	INVESTMENTS IN AND ADVANCES TO AFFILIATES During the year ended December 31, 2018, we invested $45.0 million in Entekra Holdings, LLC (Entekra), a start-up design, engineering and manufacturing company that provides off-site framing for both residential and commercial construction. This investment is recorded as an equity investment based upon the joint control of Entekra’s operations. We own 81.8% of the A units and 55% of the B units of this operation. Our portion of the earnings and losses of Entekra is included in our Consolidated Statement of Income as Income (loss) from unconsolidated affiliate. For the year ended December 31, 2018, we had no sales to Entekra. At December 31, 2018, we also have an investment in a joint venture with Resolute Forest Products to operate jointly owned I-Joist facilities in Quebec (Resolute-LP). Each partner owns 50% of the venture. We sell products and raw materials and purchase products for resale from Resolute-LP. We eliminate profits on these sales and purchases, to the extent the inventory has not been sold through to third parties, on the basis of its 50% interest. For the years ended December 31, 2018, 2017 and 2016, we sold $16.9 million, $15.5 million and $11.7 million of products to Resolute-LP and purchased $57.7 million, $60.1 million and $53.1 million of I-joists from Resolute-LP. Included in the Consolidated Balance Sheets at December 31, 2018 and 2017 are $3.8 million and $3.6 million in accounts receivable and $0.1 million and $1.2 million in accounts payable associated with Resolute-LP. For the years ended December 31, 2018 and 2017, we received $2.6 million and $3.3 million in dividends from Resolute-LP. We classified the receipt of these cash dividends as cash flows from operations. Our cumulative equity in earnings from Resolute-LP exceeds the cumulative distributions received; therefore, the dividends were deemed to be a return on our investment and not a return of our investment. We are the exclusive distributor of the I-joists produced and sold by the joint venture and it is considered an integral part of our operations. We are classifying the income (loss) from the joint venture as a reduction in cost of sales. LP recorded income from affiliates of $2.2 million in 2018, $4.0 million in 2017 and $5.2 million in 2016.

Accounts Payable and Accrued Liabilities

12 Months Ended

Dec. 31, 2018

Accounts Payable and Accrued Liabilities [Abstract]

Accounts Payable and Accrued Liabilities Disclosure [Text Block]

ACCOUNTS PAYABLE AND ACCRUED LIABILITIES

Accounts payable and accrued liabilities were as follows:



	December 31,
Dollar amounts in millions	2018		2017
Accounts payable	$	116.1	$	112.3
Salaries and wages payable	64.1		75.8
Taxes other than income taxes	3.5		3.0
Current portion of warranty reserves	3.0		9.0
Accrued interest	6.8		6.0
Accrued rebates	30.1		24.2
Other accrued liabilities	9.7		6.8
Total Accounts payable and accrued liabilities	$	233.3	$	237.1

Other accrued liabilities at December 31, 2018 and 2017 primarily consist of reforestation liabilities, accrued rent, current portion of uncertain tax position liabilities, current portion of worker compensation liabilities and other items. Additionally, included in accounts payable is $22.1 million and $19.0 million related to capital expenditures that had not yet been paid as of December 31, 2018 and as of December 31, 2017.

Income Taxes

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Income Taxes

INCOME TAXES

The Tax Act reduced the U.S. federal tax rate from 35% in 2017 to 21% in 2018 and eliminated the deduction for Domestic Production Activities. At the end of 2017, in accordance with SEC Staff Accounting Bulletin No. 118, we recorded a provisional benefit of $18.4 million resulting from the reduction in the carrying value of our U.S. deferred tax liabilities to reflect the change in the tax rate. Additionally, we calculated a provisional amount of zero for the transition tax on unrepatriated foreign earnings.

During 2018, we revised our estimate of the amount of 2017 deferred taxes related to discretionary pension contributions; and recorded an additional benefit of $3.1 million as a discrete item in the second quarter. Our accounting for this and all other elements of the Tax Act is now complete, and there were no other adjustments to the provisional amounts previously recorded.

Income Tax Provision

Income from continuing operations before income taxes consists of the following:



	Year ended December 31,
Dollar amounts in millions	2018		2017		2016
Domestic	$	359.1	$	341.8	$	98.4
Foreign	162.0		168.4		71.7
Total	$	521.1	$	510.2	$	170.1

The following presents the components of our income tax provision (benefit) from continuing operations.



	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
Current tax provision (benefit):
U.S. federal	$	55.5		$	105.8		$	60.4
State and local	8.4			4.4			4.4
Foreign	31.7			7.9			10.4
Net current tax provision (benefit)	95.6			118.1			75.2
Deferred tax provision (benefit):
U.S. federal	11.2			(19.3		)	(48.1		)
State and local	5.8			8.0			1.2
Foreign	11.1			38.2			11.7
Net valuation allowance increase (decrease)	(1.4		)	(25.9		)	(20.2		)
Net deferred tax benefit	26.7			1.0			(55.4		)
Total income tax provision (benefit)	$	122.3		$	119.1		$	19.8

We received income tax refunds during 2018, 2017 and 2016 of $0.2 million, $0.3 million and $0.8 million and paid cash taxes of $89.9 million, $143.1 million and $8.7 million. Included in the Consolidated Balance Sheets at December 31, 2018 and 2017 are income tax receivables of $16.3 million and $2.2 million and income taxes payable of $21.0 million and $4.5 million.

Deferred Taxes

The tax effects of significant temporary differences creating deferred tax assets and liabilities were as follows:



	December 31,
Dollar amounts in millions	2018			2017 ¹
Accrued liabilities	$	21.4		$	26.6
Pension and post-retirement benefits	8.3			19.9
Share-based compensation	5.3			6.9
Benefit of capital loss and NOL carryovers	15.8			38.9
Other	13.1			10.2
Inventories	7.7			6.6
Market value write down of ARS	3.3			4.9
Benefit of tax credit carryovers	0.4			3.5
Valuation allowance	(12.0		)	(13.6		)
Total deferred tax assets	63.3			103.9
Property, plant and equipment	(111.8		)	(118.2		)
Timber and timberlands	(9.8		)	(11.4		)
Installment sale gain deferral	—			(5.2		)
Total deferred tax liabilities	(121.6		)	(134.8		)
Net deferred tax liabilities	$	(58.3	)	$	(30.9	)
Balance sheet classification
Long-term deferred tax asset	3.9			2.5
Long-term deferred tax liability	(62.2		)	(33.4		)
	$	(58.3	)	$	(30.9	)

¹Prior year information has been revised to further breakout accrued liabilities into pension and post-retirement liabilities and share-based compensation.

The benefit relating to capital loss, net operating loss (NOL) and credit carryovers included in the above table at December 31, 2018 consists of:



Dollar amounts in millions	Expiration Beginning in	Benefit Amount		Valuation Allowance
State NOL carryovers	2020	$	9.9	$	(0.5	)
State credit carryovers	2019	0.3		(0.1		)
Canadian capital loss carryovers	Indefinitely	5.7		(5.7		)
Canadian credit carryovers	2026	0.1		—
Chilean NOL carryovers	Indefinitely	0.2		(0.2		)
		$	16.2	$	(6.5	)

We periodically review the need for valuation allowances against deferred tax assets and recognize these deferred tax assets to the extent that their realization is more likely than not. As part of our review, we consider all positive and negative evidence, including earnings history, the future reversal of deferred tax liabilities, and the relevant expirations of carryforwards. We believe that the valuation allowances provided are appropriate. If future years’ earnings differ from the estimates used to establish these valuation allowances, or other objective positive or negative evidence arises, we may be required to record an adjustment resulting in an impact on tax expense (benefit) for that period.

As of December 31, 2018, certain of our foreign subsidiaries had accumulated undistributed earnings of approximately $100.0 million. These earnings have been, and are intended to be, indefinitely reinvested in our foreign operations, and we expect future US cash generation to be sufficient to meet our future US cash needs. As a result, no deferred taxes have been recorded with respect to the difference between the financial accounting value and the tax basis in these subsidiaries.

Since most of these earnings have previously been subject to the one-time US transition tax on foreign earnings required by the 2017 Tax Act, they are eligible to be repatriated without additional US tax. Any additional taxes due with respect to such earnings, if repatriated to the US, would generally be limited to foreign withholding taxes, which we estimate could be up to $22.0 million.

Tax Rate Reconciliation

The following table summarizes the differences between the statutory U.S. federal and effective income tax rates on continuing operations:



	Year ended December 31,
	2018		2017		2016
U.S. federal tax rate	21	%	35	%	35	%
State and local income taxes	3		2		2
Effect of foreign tax rates	2		(3	)	(5	)
Effect of foreign exchange on functional currencies	(1	)	1		2
Tax credits	(1	)	(1	)	(12	)
Capital gain - timber	—		—		(15	)
Stock-based compensation	(1	)	—		(2	)
Domestic manufacturing deduction	—		(2	)	(2	)
Valuation allowance	—		(6	)	(12	)
Uncertain tax positions	—		1		21
Effect of U.S. federal rate change on deferred taxes	(1	)	(3	)	—
Other, net	1		(1	)	—
Effective tax rate (%)	23	%	23	%	12	%

We are subject to U.S. federal income tax as well as income taxes of multiple state jurisdictions. Our foreign subsidiaries are subject to income tax in Canada, Chile, Peru, Brazil, Colombia and Argentina.

U.S. tax years are now closed through 2014, and no audits are currently in progress. We remain subject to U.S. federal examinations of tax years 2015 to 2017 as well as state and local tax examination for the tax years 2007-2017. In 2016, Canada completed its audits of tax years 2012 and 2013; tax years 2014 through 2017 are subject to examination. Quebec provincial audits have been effectively settled through 2016 and Quebec is currently reviewing 2017. Chilean returns for the 2010 through 2016 tax years have been audited and various issues that were appealed in the Chilean courts have recently been settled while others remain ongoing. Tax year 2017 is currently being reviewed. Brazilian returns for years 2013 to 2017 are subject to examination but no audits are currently in progress.

Uncertain Tax Positions

In accordance with the accounting for uncertain tax positions, the following is a tabular reconciliation of the total amount of unrecognized tax benefits at the beginning and end of the years presented:



	December 31,
Dollar amounts in millions	2018			2017			2016
Beginning balance	$	40.3		$	39.8		$	4.1
Increases:
Tax positions taken in current year	0.7			0.6			26.9
Tax positions taken in prior years	0.7			1.2			10.4
Decreases:
Tax positions taken in current year	—			—			—
Tax positions taken in prior years	—			(1.3		)	—
Settlements during the year	(0.9		)	—			—
Lapse of statute in current year	—			—			(1.6		)
Ending balance	$	40.8		$	40.3		$	39.8

Included in the above balances at December 31, 2018 and 2017 is $40.2 million and $39.9 million of tax benefits that, if recognized, would affect our effective tax rate. We accrued interest of $0.3 million and paid no interest during 2018 and accrued interest of $0.7 million and paid no interest during 2017. In total, we have recognized a liability of $3.4 million and $3.7 million for accrued interest related to our uncertain tax positions as of December 31, 2018 and 2017.

Non-operating Income (Expense) (Notes)

12 Months Ended

Dec. 31, 2018

Nonoperating Income (Expense) [Abstract]

Other Income and Other Expense Disclosure [Text Block]

NON-OPERATING INCOME (EXPENSE)

Included in our Consolidated Statements of Income is non-operating expense of $2.1 million, $22.6 million and $45.3 million for the years ended December 31, 2018, 2017 and 2016. This income (expense) is comprised of the following components:



	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
Interest expense	$	(19.0	)	$	(20.6	)	$	(32.9	)
Amortization of debt charges	(0.8		)	(0.9		)	(1.1		)
Capitalized interest	4.0			2.2			1.9
Interest expense, net of capitalized interest	(15.8		)	(19.3		)	(32.1		)
Interest income	18.1			9.5			8.0
Gain on securities	0.4			—			—
SERP market adjustments	(0.9		)	1.0			0.2
Investment income	17.6			10.5			8.2
Net periodic pension cost, excluding service cost	(4.3		)	(9.4		)	(6.2		)
Foreign currency losses	0.4			(4.4		)	2.1
Early debt extinguishment	—			—			(17.3		)
Other non-operating income (expense)	(3.9		)	(13.8		)	(21.4		)
Total non-operating income (expense)	$	(2.1	)	$	(22.6	)	$	(45.3	)

Long-term Debt

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Long-term Debt

LONG-TERM DEBT



	December 31,
Dollar amounts in millions	2018											2017
	Interest Rate		Principal			Unamortized Debt Costs			Total			Principal			Unamortized Debt Costs			Total
Debentures:
Senior unsecured notes, maturing 2024, interest rates fixed	4.875	%	$	350.0		$	(3.7	)	$	346.3		$	350.0		$	(4.4	)	$	345.6
Bank credit facilities:
Chilean term credit facility, maturing 2019, interest rates fixed	UF+3.9%		4.7			(0.1		)	4.6			7.7			(0.1		)	7.6
Limited recourse notes payable:
Senior notes, payable matured 2018, interest rates fixed	7.3	%	—			—			—			22.0			—			22.0
Other financing:
Capital leases			1.0			—			1.0			0.7			—			0.7
Total			355.7			(3.8		)	351.9			380.4			(4.5		)	375.9
Less: current portion			(5.0		)	—			(5.0		)	(25.1		)	—			(25.1		)
Net long-term portion			$	350.7		$	(3.8	)	$	346.9		$	355.3		$	(4.5	)	$	350.8

Deferred debt costs are amortized over the life of the related debt using a straight line basis which approximates the effective interest method. These costs are a direct deduction from the carrying amount related to the debt liability. If the debt is retired early, the related unamortized deferred financing costs are written off in the period the debt is retired to other non-operating income (expense). We amortized deferred debt costs of $0.8 million, $0.9 million and $1.1 million for the years ended December 31, 2018, 2017 and 2016. Included in these amortized amounts are deferred debt costs associated with our current line of credit, which is recorded within "Other Assets" on LP's Consolidated Balance Sheet.

We estimated our limited recourse notes payable to have a fair value of approximately $22.4 million at December 31, 2017. We estimated the Senior Notes due 2024 to have a fair value of $337.9 million and $363.9 million at December 31, 2018 and 2017 based upon market quotations. We believe the carrying amounts of the Chilean term credit facility approximates fair market value based upon current interest rates with similar remaining maturities.

We issued $348.6 million of senior notes in June 1998 in a private placement to institutional investors. The remaining notes payable of $22.0 million were repaid in 2018. These notes were secured by $22.2 million of notes receivable from Green Diamond Resource Company (Green Diamond), which were received in 2018.

In December 2013, we entered into a credit agreement with various lenders and American AgCredit, PCA, as administrative agent and CoBank, ACB, as letter of credit issuer. The credit agreement provides for a $200 million revolving credit facility, with a $60 million sublimit for letters of credit. The credit facility terminates and all loans made under the credit agreement become due in December 2022. As of December 31, 2018 and 2017, no revolving borrowings were outstanding under the credit facility. Certain of LP’s existing and future wholly owned domestic subsidiaries may guaranty our obligations under the credit facility and, subject to certain limited exceptions, provide security through a lien on substantially all of the personal property of these subsidiaries. Revolving borrowings under the credit agreement accrue interest, at our option, at either a “base rate” plus a margin of 0.63% to 1.75% or LIBOR plus a margin of 1.63% to 2.75%. The credit agreement also includes an unused commitment fee, due quarterly, ranging from 0.20% to 0.500%. The applicable margins and fees within these ranges are based on our ratio of consolidated EBITDA to cash interest charges. The “base rate” is the highest of (i) the Federal funds rate plus 0.5%, (ii) the U.S. prime rate, and (iii) one month LIBOR plus 1.0%.

The credit agreement contains various restrictive covenants and customary events of default. The credit agreement also contains financial covenants that require the Company and its consolidated subsidiaries to have, as of the end of each quarter, (i) a capitalization ratio (i.e., funded debt to total capitalization) of no more than 40% and (ii) current ratio (i.e., current assets to current liabilities) of at least 2 to 1, in each case calculated in the manner specified in the credit agreement. As of December 31, 2018, we were in compliance with all financial covenants under the credit agreement.

In December 2009, we entered into a term loan agreement with Banco de Credito e Inversiones for UF 943,543.7391 (equivalent to $39 million at the time of inception). The loan will be repaid in 16 semi-annual principal payments that began in June 2012 and end in December 2019. The loan bears interest at UF plus 3.90% per annum and contains various restrictive covenants and requires the maintenance by LP Chile of a debt to equity ratio of less than or equal to 1. If LP Chile is late in making payments, it will also be required to maintain a ratio of net debt to earnings before interest, taxes, depreciation and amortization (EBITDA) of less than or equal to 2.5 and a ratio of EBITDA to financial costs of at least 3. The loan agreement also contains customary events of default, the occurrence of which could result in acceleration of our obligations to repay the indebtedness outstanding. Any increases or decreases in the loan balance shown are related to the change in the underlying foreign currency exchange rates, the UF or principal payments. W made principal payments of $2.3 million during 2018. The impact of foreign currency exchange rates in 2018 was $0.9 million which was offset by a UF change of $0.2 million.

In September 2016, we issued $350.0 million aggregate principal of 4.875% Senior Notes due in 2024. On or after September 15, 2019, we may, at our option on one or more occasions, redeem all or any portion of these notes at specified redemption rates. Obligations under the indenture governing our notes are unsecured and not presently guaranteed by any of our subsidiaries. The indenture contains customary covenants applicable to us and our subsidiaries, other than certain unrestricted subsidiaries, including restrictions on actions and activities that are restricted under the credit facility. The indenture also contains customary events of default, the occurrence of which could result in acceleration of our obligations to repay the indebtedness outstanding thereunder.

The weighted average interest rate for all long-term debt at December 31, 2018 and 2017 was approximately 4.9% and 5.1% . Required repayment of principal for long-term debt is as follows:



Dollar amounts in millions
Years ending December 31,
2019	$	5.2
2020	0.2
2021	0.2
2022	0.1
2023	—
2024 and after	350.0
Total	$	355.7

Cash paid during 2018, 2017 and 2016 for interest (net of capitalized interest) was $19.8 million, $17.5 million and $27.2 million.

Stock-Based Compensation

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

STOCKHOLDERS' EQUITY

Preferred Stock

We are authorized to issue up to 15,000,000 shares of preferred stock at $1.00 par value. At December 31, 2018, no shares of preferred stock have been issued.

Common Stock Plan

We have a stock-based compensation plan under which stock options, SSARs, restricted stock (including units) and performance shares awards are granted. At December 31, 2018, 3.0 million shares were available under the current plan for these awards.



	Year ended December 31,
Dollar amounts in millions	2018		2017		2016
Total stock-based compensation expense (costs of sales, selling, general and administrative and other operating credits and charges, net)	$	8.6	$	9.7	$	13.0
Income tax benefit related to stock-based compensation	$	3.1	$	0.8	$	3.4
Impact on cash flow due to taxes paid related to net share settlement of equity awards	$	9.3	$	5.9	$	9.2

We recognize the compensation costs on a straight-line basis over the requisite service period of the award, which is generally the vesting term of three years. Compensation costs that were capitalized to inventory were not material.

SSARs

Prior to January 1, 2018, we granted SSARs to key employees. On exercise, we generally issue these shares from treasury. The SSARs are granted at market price at the date of grant. SSARs become exercisable over three years and expire ten years after the date of grant. The following table sets out the weighted average assumptions used to estimate the fair value of the SSARs granted using the Black-Scholes option-pricing model:



	2017			2016
Expected stock price volatility	41		%	45		%
The fair values of stock-based payments were valued using the Black-Scholes valuation method with a volatility factor based on our historical stock prices.
Expected dividend yield	—		%	—		%
The Black-Scholes valuation model calls for a single expected dividend yield as an input. This is determined based upon current annual dividend as of the date of grant compared to the grant price.
Risk-free interest rate	2.1		%	1.4		%
We base the risk-free interest rate used in the Black-Scholes valuation method on U.S. Treasury issues with an equivalent term. Where the expected term of our stock-based awards do not correspond with the terms for which interest rates are quoted, we perform a straight-line interpolation to determine the rate from the available maturities.
Expected life of options (in years)	6 years			6 years
Expected life represents the period that LP’s stock-based awards are expected to be outstanding and was determined based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards, vesting schedules and expectations of future employee behavior as influenced by changes to the terms of its stock-based awards.
Weighted average fair value of options and SSARs granted	$	8.02		$	6.99

Restricted Shares

We grant restricted awards (shares or units) to certain key employees and directors. The awards can either be time vested or vested based upon the attainment of certain performance metrics over a certain time period. Awards granted under this plan to employees generally have a performance or vesting period of three years from the date of grant and to directors over one year. Certain of these awards are eligible to received dividend equivalent shares.The market value of these grants approximates the fair value. For awards based upon the achievement of the performance goals, the award are earned ratably from 0% to 200%.

Summary of Stock Awards Outstanding

The following table summarizes stock awards as of December 31, 2018 as well as activity during the last year.



	Stock Options / SSARS					Restricted stock					Restricted units
	Number of Awards			Weighted Average Exercise Price		Number of Awards			Weighted Average Grant Date Fair Value		Number of Awards			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2017	2,404,808			$	14.76	311,215			$	17.33	851,244			$	18.93
Granted	—			—		—			—		491,114			27.74
Exercised	(1,201,644		)	13.91		—			—		—			—
Vested	—			—		(64,747		)	17.04		(217,000		)	17.95
Forfeited	(61,478		)	17.51		(6,294		)	16.80		(168,744		)	21.59
Outstanding at December 31, 2018	1,141,686			$	15.50	240,174			$	17.43	956,614			$	23.17
Vested and expected to vest at December 31, 2018⁽¹⁾	1,084,602			$	15.50	228,165			$	17.43	908,783			$	23.17
Exercisable at December 31, 2018	870,431			$	14.83	—			—		—			$	—
Unrecognized compensation costs (in millions)	$	0.5				$	0.7				$	9.7
to be recognized over weighted average period of years	0.8					0.6					1.3

_______________


⁽¹⁾	Expected to vest based upon historical forfeiture rate

The aggregate intrinsic value of the stock options and SSARs represented in the above table is the total pre-tax intrinsic value (the difference between our closing stock price on the last trading day of 2018 and the exercise price, multiplied by the number of in-the-money options and SSARs) that would have been received by the holders had all holders exercised their awards on December 31, 2018. This amount, $7.7 million, changes based on the market value of our stock as reported by the New York Stock Exchange.

The intrinsic value of SSARs exercised in the years ended December 31, 2018, 2017 and 2016 was $35.2 million, $26.5 million and $29.8 million. The total fair value of awards vested during the years ended December 31, 2018, 2017 and 2016, was $7.8 million, $6.7 million and $3.8 million.

Asset Retirement Obligation

12 Months Ended

Dec. 31, 2018

ASSET RETIREMENT OBLIGATIONS [Abstract]

Asset Retirement Obligation Disclosure [Text Block]

ASSET RETIREMENT OBLIGATIONS

The activity in our asset retirement obligation liability for 2018 and 2017 is summarized in the following table. These are included in “Other long-term liabilities” in the Consolidated Balance Sheets. Our asset retirement obligation reflects the estimated present value of its obligations for capping, closure and post closure costs with respect to landfills we own or operate and other on-going environmental monitoring costs.



Dollar amounts in millions	Year ended December 31,
Dollar amounts in millions	2018			2017
Beginning balance	$	10.8		$	10.2
Accretion expense	0.9			0.8
Adjusted to expense during the year	1.6			—
Adjusted to other operating credits and charges, net	(0.8		)	—
Payments made	(0.4		)	(0.3		)
Translation	(0.1		)	0.1
Ending balance	$	12.0		$	10.8

Other Operating Credits and Charges, Net

12 Months Ended

Dec. 31, 2018

Other Operating Credits And Charges, Net [Abstract]

Other Operating Credits And Charges Net [Text Block}

OTHER OPERATING CREDITS AND CHARGES, NET

The major components of “Other operating credits and charges, net” in the Consolidated Statements of Income for the years ended December 31 are reflected in the table below and described in the paragraphs following the table:



Dollar amounts in millions	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
Reorganization charges	$	(10.3	)	$	—		$	—
Refund of sales and use taxes	0.5			0.8			—
Refund of environmental costs	8.3			—			—
Loss on workers compensation reserve	—			(0.9		)	—
Adjustment to product related warranty reserves	7.7			(5.4		)	(16.9		)
Expenses related to hurricane	(4.5		)	—			—
Other	0.5			0.6			(0.5		)
	$	2.2		$	(4.9	)	$	(17.4	)

2018

During 2018, we recorded a $2.2 million gain in "Other operating credits and charges, net". The components of the net credits include:


•	a gain of $8.3 million related to the settlement of previously-paid environmental costs or the liability for future environmental costs to be paid by a third party associated with a non-operating site;


•	a gain of $7.7 million related to the reduction of product related warranty reserves associated with CanExel products sold in specific geographic locations and for a specific time period;


•	a loss of $10.3 million on severance and other charges related to certain reorganizations within the corporate offices, including the costs associated with the retirement of our previous chief financial officer; and


•	a loss of $4.5 million related to property damage sustained by our Wilmington facility during the recent hurricane.

2017

During 2017, we recorded an $4.9 million loss in "Other operating credits and charges, net". The components of the net charges include:


•	a loss of $5.4 million related to an increase in product related warranty reserves associated with CanExel products sold in specific geographic locations and for a specific time period;


•	a refund of $0.8 million related to sales and use taxes; and


•	a loss of $0.9 million associated with a workers' compensation reserve change.

2016

During 2016, we recorded a $17.4 million loss in "Other operating credits and charges, net". The components of the net charges include:


•	a loss of $16.9 million related to an increase in product related warranty reserves and a related adjustment of $0.5 million to value added taxes associated with CanExel products sold in specific geographic locations and for a specific time period.

Severance

Over the course of the last three years, we have entered into restructuring plans in an effort to reduce overall expenses. The detail of the severance accrual and related expense and payments for the last three years is as follows:



Dollar amounts in millions	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
Beginning balance at December 31,	$	1.7		$	0.2		$	0.2
Accrued to expense during the year	0.3			3.7			0.5
Accrued to other operating credits and charges, net	10.3			—			—
Payments	(6.8		)	(2.2		)	(0.5		)
Ending balance	$	5.5		$	1.7		$	0.2

The balance of accrued severance is included in "Accounts payable and accrued liabilities" on our Consolidated Balance Sheets. The balance as of December 31, 2018 is payable under contract through 2020. For the year ended December 31, 2018, severance expense is primarily related to general and corporate expenses.

Gain (loss) on sales or impairment of long lived assets

12 Months Ended

Dec. 31, 2018

GAIN (LOSS) ON SALE OF AND IMPAIRMENT OF LONG-LIVED ASSETS, NET [Abstract]

Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block]

LOSS) ON SALE OR IMPAIRMENT OF LONG-LIVED ASSETS

The major components of “Gain (loss) on sale or impairment of long-lived assets” in the Consolidated Statements of Income for the years ended December 31 are reflected in the table below and are described in the paragraphs following the table:



Dollar amounts in millions	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
Impairment charges on long-lived assets	$	(10.7	)	$	(9.1	)	$	(0.8	)
Gain (loss) on sale or other disposition of other long-lived assets	(0.1		)	2.3			9.2
	$	(10.8	)	$	(6.8	)	$	8.4

2018

During 2018, we recorded a net loss on sale or impairment of long-lived assets of $10.8 million associated with a facility that is no longer used that is anticipated to be sold.

2017

During 2017, we recorded a net loss on sale or impairment of long-lived assets of $6.8 million. This net loss includes the following items:


•	a loss of $4.7 million associated with a facility which was previously held for sale;


•	a loss of $3.0 million associated with manufacturing equipment which is no longer being used; and


•	a gain $2.3 million on the sale of manufacturing facilities no longer used.

2016

During 2016, we recorded a net gain on sale of long-lived assets of $8.4 million. This net loss includes the following items:


•	a loss of $0.8 million related to the impairment on certain manufacturing assets associated with various OSB mills;


•	a gain of $10.6 million related to the exchange of an idled OSB mill; and


•	a loss of $1.4 million related to the disposal of various assets no longer used.

Contingencies

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Contingencies Disclosure [Text Block]

CONTINGENCIES

We maintain reserves for various contingent liabilities as follows:



	December 31,
Dollar amounts in millions	2018			2017
Environmental reserves	$	10.6		$	15.0
Other reserves	0.2			0.1
Total contingencies	10.8			15.1
Current portion	(2.3		)	(3.4		)
Long-term portion	$	8.5		$	11.7

Estimates of our loss contingencies are based on various assumptions and judgments. Due to the numerous uncertainties and variables associated with these assumptions and judgments, both the precision and reliability of the resulting estimates of the related contingencies are subject to substantial uncertainties. We regularly monitor our estimated exposure to contingencies and, as additional information becomes known, may change its estimates significantly. While no estimate of the range of any such change can be made at this time, the amount that we may ultimately pay in connection with these matters could materially exceed, in either the near term or the longer term, the amounts accrued to date. Our estimates of our loss contingencies do not reflect potential future recoveries from insurance carriers except to the extent that recovery may from time to time be deemed probable as a result of an insurer’s agreement to payment terms.

Environmental Proceedings

We are involved in a number of environmental proceedings and activities, and may be wholly or partially responsible for known or unknown contamination existing at a number of other sites at which we have conducted operations or disposed of wastes. Based on the information currently available, management believes that any fines, penalties or other costs or losses resulting from these matters will not have a material effect on our financial position, results of operations, cash flows or liquidity.

We maintain a reserve for undiscounted estimated environmental loss contingencies. This reserve is primarily for estimated future costs of remediation of hazardous or toxic substances at numerous sites currently or previously owned by the Company. Our estimates of our environmental loss contingencies are based on various assumptions and judgments, the specific nature of which varies in light of the particular facts and circumstances surrounding each environmental loss contingency. These estimates typically reflect assumptions and judgments as to the probable nature, magnitude and timing of required investigation, remediation and/or monitoring activities and the probable cost of these activities, and in some cases reflect assumptions and judgments as to the obligation or willingness and ability of third parties to bear a proportionate or allocated share of the cost of these activities. Due to the numerous uncertainties and variables associated with these assumptions and judgments, and the effects of changes in governmental regulation and environmental technologies, both the precision and reliability of the resulting estimates of the related contingencies are subject to substantial uncertainties. We regularly monitor our estimated exposure to environmental loss contingencies and, as additional information becomes known, may change our estimates significantly. However, no estimate of the range of any such change can be made at this time.

In those instances in which our estimated exposure reflects actual or anticipated cost-sharing arrangements with third parties, we do not believe that we will be exposed to additional material liability as a result of non-performance by such third parties. There are three forms of cost-sharing arrangements under which costs are apportioned to others and are therefore not reflected in our environmental reserves. The amounts involved, the number of sites and a description of each are as follows:


•	Approximately $1.9 million of costs, related to two sites, pursuant to formal cost-sharing arrangements between us and one or more third parties.


•	Approximately $2.1 million of costs, related to two transactions each covering multiple sites, pursuant to agreements contained in purchase and sale documents where we have sold an asset to a third party and that third party has assumed responsibility for all or a portion of any remediation costs required for the sold asset.


•	Approximately $0.3 million of costs, related to two sites undergoing cleanup pursuant to federal or state environmental laws, where multiple parties are involved.

We consider the financial condition of third parties subject to the cost-sharing arrangements discussed above in determining the amounts to be reflected in our environmental reserves. In addition, we are a party to clean-up activities at two additional sites for which we do not believe that the failure of a third party to discharge its allocated responsibility would significantly increase our financial responsibility based on the manner in which financial responsibility has been, or is expected to be, allocated.

Our estimates of our environmental loss contingencies do not reflect potential future recoveries from insurance carriers except to the extent that recovery may from time to time be deemed probable as a result of a carrier’s agreement to payment terms.

The activity in our reserve for estimated environmental loss contingency reserves for the last three years is summarized in the following table.



	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
Beginning balance	$	15.0		$	15.9		$	16.6
Adjusted to expense (income) during the year	(2.1		)	1.2			0.7
Payments made	(2.2		)	(2.1		)	(1.4		)
Translation	(0.1		)	—			—
Ending balance	$	10.6		$	15.0		$	15.9

Recorded in Other assets is $1.4 million related to a receivable for reimbursements of environmental costs associated with a non-operating site as of December 31, 2018.

During 2018, 2017 and 2016, we adjusted our reserves at a number of sites to reflect current estimates of remediation costs and environmental settlements.

Other Proceedings

We and our subsidiaries are parties to other legal proceedings in the ordinary course of business. Based on the information currently available, management believes that the resolution of such proceedings will not have a material adverse effect on our financial position, results of operations, cash flows or liquidity.

Committments and Contingent Liabilities

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments Disclosure [Text Block]

COMMITMENTS AND CONTINGENT LIABILITIES

Self insurance

We are primarily self-insured for workers’ compensation and employee health care liability costs. Self-insurance liabilities for workers’ compensation are determined based upon a valuation performed by an actuarial firm. The estimate of future workers’ compensation liabilities incorporates loss development and an estimate associated with incurred but not yet reported claims. These claims are discounted. Self-insurance liabilities for employee health costs are determined actuarially based upon claims filed and estimated claims incurred but not yet reported. These claims are not discounted.

Indemnities and Guarantees

We are a party to contracts in which we agree to indemnify third parties for certain liabilities that arise out of or relate to the subject matter of the contract. In some cases, this indemnity extends to related liabilities arising out of the negligence of the indemnified parties, but usually excludes any liabilities caused by gross negligence or willful misconduct of the indemnified parties. We cannot estimate the potential amount of future payments under these agreements until events arise that would trigger the liability.

Additionally, in connection with certain sales of assets and divestitures of businesses, we have agreed to indemnify the buyer and related parties for certain losses or liabilities incurred by the buyer or such related parties with respect to (1) the representations and warranties made to the buyer by us in connection with the sales and (2) liabilities related to the pre-closing operations of the assets sold. Indemnities related to pre-closing operations generally include environmental liabilities, tax liabilities and other liabilities not assumed by the buyer.

Indemnities related to the pre-closing operations of sold assets normally do not represent added liabilities for us, but simply serve to protect the buyer from potential liability associated with the obligations that existed (known and unknown) at the time of the sale. We record accruals for those pre-closing obligations that are considered probable and estimable. We have not accrued any additional amounts as a result of the indemnity agreements summarized below as we believes the fair value of the guarantees are not material.


•	In connection with various sales of our timberlands, we have agreed to indemnify various buyers with respect to losses resulting from breaches of limited representations and warranties contained in these agreements. These indemnities generally are capped at a maximum potential liability and have an unspecified duration.


•	In connection with the sale by LP Canada Pulp Ltd (LPCP) of its pulp mill in Chetwynd, BC, Canada to Tembec, Ltd in October 2002, we provided an indemnity of unspecified duration provided by LPCP for liabilities arising out of pre-closing operations. These indemnities, which do not extend to environmental liabilities, are capped at C$15.0 million in the aggregate.


•	In connection with the mill exchange by LP Canada of its non-operating OSB mill in Chambord, Quebec to Norbord in November 2016, we provided an indemnity for liabilities arising out of pre-closing operations. These indemnities are capped at C$5.0 million in aggregate.

We also have various other indemnities that are individually and in the aggregate immaterial.

We will record a liability related to specific indemnification when future payment is probable and the amount is estimable.

Operating Leases

We lease certain office, manufacturing, warehousing and other plant sites and equipment. The leases generally provide for the lessee to pay taxes, maintenance, insurance and certain other operating costs of the leased properties.

At December 31, 2018, future minimum commitments are as follows:



Dollar amounts in millions
Year ended December 31,
2019	$	8.4
2020	7.3
2021	4.6
2022	1.8
2023	—
2024 and thereafter	—
Total	$	22.1

Rental expense for operating leases amounted to $15.1 million, $12.5 million and $11.0 million in 2018, 2017 and 2016.

Product Warranty

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Guarantees and Indemnifications

We offer warranties on the sale of most of our products and record an accrual for estimated future claims. Such accruals are based upon historical experience and management’s estimate of the level of future claims. The activity in warranty reserves for the last three years is summarized in the following table.



	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
Beginning balance	$	24.7		$	24.1		$	21.0
Accrued to expense during the year	1.0			1.0			0.8
Accrued/ (credited) to other operating credits and charges	(7.7		)	5.4			16.9
Accrued to discontinued operations	5.0			1.5			0.5
Foreign currency translation	(0.7		)	2.2			(0.2		)
Payments made	(8.8		)	(9.5		)	(14.9		)
Total warranty reserves	13.5			24.7			24.1
Current portion of warranty reserves	(3.0		)	(9.0		)	(9.0		)
Long term portion of warranty reserves	$	10.5		$	15.7		$	15.1

The current portion of the warranty reserve is included in “Accounts payable and accrued liabilities” and the long-term portion is included in “Other long-term liabilities” on the Consolidated Balance Sheets.

We changed the warranty reserves related to CanExel products sold in certain geographic areas and for a specific time period decreasing by $7.7 million in 2018 and increasing by $5.4 million in 2017. The changes to the reserve reflected revised estimates of future claims.

We increased the warranty reserves related to discontinued composite decking products by $5.0 million, $1.5 million and $0.5 million for the years ended December 31, 2018, 2017 and 2016. The additional reserves reflect revised estimates of future claim payments based upon an increase in decking warranty claims.

We believe that the warranty reserve balances at December 31, 2018 are adequate to cover future warranty payments. However, it is possible that additional charges may be required.

Discontinued Operations

12 Months Ended

Dec. 31, 2018

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

DISCONTINUED OPERATIONS

Over the last several years, we have sold selected businesses and assets in order to improve our operating results. For all periods presented, these operations include residual losses of mills divested in past years and associated warranty and other liabilities associated with these operations.



Dollar amounts in millions	2018			2017			2016
Operating loss	$	(5.6	)	$	(2.0	)	$	(0.8	)
Cash provided by (used in) operations from discontinued operations	(6.7		)	(1.8		)	(2.6		)

Included in the operating losses of discontinued operations for the years ended December 31, 2018, 2017 and 2016 is an increase in warranty reserves of $5.0 million, $1.5 million and $0.5 million associated with discontinued composite decking products. Included in cash provided by (used in) operating activities on our Consolidated Statements of Cash Flows for the years ended December 31, 2018, 2017 and 2016 is $6.1 million, $1.3 million and $2.3 million of cash settlements of warranty obligations associated with discontinued operations.

Retirement Plans and Post Retirement Benefits

12 Months Ended

Dec. 31, 2018

Retirement Benefits [Abstract]

Retirement Plans and Postretirement Benefits

RETIREMENT PLANS AND POSTRETIREMENT BENEFITS

We sponsor various defined benefit and defined contribution retirement plans that provide retirement benefits to substantially all of our employees. Most regularly scheduled employees are eligible to participate in these plans except those covered by a collective bargaining agreement, unless the collective bargaining agreement specifically allows for participation in our plans. We contribute to a multiemployer plan for certain employees covered by collective bargaining agreements. We also provide other post-retirement benefits consisting primarily of healthcare benefits to certain retirees who meet age and service requirements.

Defined Benefit Plans

Pension benefits are earned generally based upon years of service and compensation during active employment. Contributions to the qualified defined benefit pension plans are based on actuarial calculations of amounts to cover current service costs and amortization of prior service costs over periods ranging up to 20 years. We contribute additional funds as necessary to maintain desired funding levels. As of January 1, 2018, we retroactively adopted ASU 2017-07, "Retirement Benefits - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost". See Note 2 for further discussion.

Benefit accruals under our most significant plan, which account for approximately 81% of the assets and 83% of the benefit obligations in the tables below, had been credited at the rate of 4% of eligible compensation with an interest credit based upon the 30-year U.S. Treasury rate. The Company discontinued providing contribution credits effective January 1, 2010 to this plan. The remaining defined benefit pension plans in Canada use a variety of benefit formulas, and we will discontinue providing contribution credits effective January 1, 2019.

We also maintain a Supplemental Executive Retirement Plan (SERP), an unfunded, non-qualified defined benefit plan intended to provide supplemental retirement benefits to certain executives. Benefits are generally based on compensation in the years immediately preceding normal retirement. During the years ended December 31, 2018 and 2017, we recorded a plan settlement charge of $0.1 million and $3.1 million associated with the retirement of our executives during 2018 and 2017. As of December 31, 2018, we have no active participants in the SERP plan.

The projected benefit obligation is the actuarial present value of benefits attributable to employee service rendered to date, including the effects of estimated salary increases. The following table details information regarding our pension plans at December 31:



Dollar amounts in millions	2018			2017
Change in benefit obligation:
Beginning of year balance	$	345.5		$	331.9
Service cost	2.6			4.9
Interest cost	11.1			12.5
Actuarial loss	(24.5		)	10.8
Curtailment	(1.3		)	—
Foreign exchange rate changes	(4.5		)	3.6
Benefits paid	(32.2		)	(18.2		)
End of year balance	$	296.7		$	345.5
Change in assets (fair value):
Beginning of year balance	$	265.9		$	239.9
Actual return on plan assets	(7.3		)	27.8
Employer contribution	52.9			12.7
Foreign exchange rate changes	(4.5		)	3.7
Benefits paid	(32.2		)	(18.2		)
End of year balance	$	274.8		$	265.9
Funded status:
Plan assets (less than) over benefit obligations:	$	(21.9	)	$	(79.6	)

Amounts included in the balance sheet:
Noncurrent pension assets, included in “Other assets”	$	4.5		$	1.4
Current pension liabilities, included in “Accounts payable and accrued liabilities”	(3.1		)	(12.1		)
Noncurrent pension liabilities, included in “Other long-term liabilities”	(23.3		)	(68.9		)
Net amount recognized	$	(21.9	)	$	(79.6	)

The pretax amounts recognized in Accumulated other comprehensive loss were as follows:



Dollar amounts in millions	Actuarial losses			Prior service cost			Total
December 31, 2016	$	(140.6	)	$	(8.4	)	$	(149.0	)
Other comprehensive income (loss) before reclassifications	3.2			—			3.2
Amounts reclassified from accumulated comprehensive loss	9.3			0.5			9.8
December 31, 2017	(128.1		)	(7.9		)	(136.0		)
Other comprehensive income (loss) before reclassifications	4.1			—			4.1
Amounts reclassified from accumulated comprehensive loss	7.6			0.5			8.1
December 31, 2018	$	(116.4	)	$	(7.4	)	$	(123.8	)

Weighted-average assumptions used to calculate our benefit obligations at December 31:



	2018		2017
Discount rate:
US	4.2	%	3.5	%
Canada	3.8	%	3.3	%
SERP	NA		2.9	%
Rate of compensation increase:
US	NA		NA
Canada	3.5	%	3.5	%
SERP	NA		3.0	%

Benefit obligations by plan category are as follows:



	2018
Dollar amounts in millions	US			Canada		SERP			Total
Fair value of plan assets	$	222.4		$	52.4	$	—		$	274.8
Benefit obligation	244.8			49.0		2.9			296.7
Funded Status	$	(22.4	)	$	3.4	$	(2.9	)	$	(21.9	)

	2017
	US			Canada		SERP			Total
Fair value of plan assets	$	207.7		$	58.2	$	—		$	265.9
Benefit obligation	272.6			58.1		14.8			345.5
Funded Status	$	(64.9	)	$	0.1	$	(14.8	)	$	(79.6	)

The total accumulated benefit obligation for all pension plans as of December 31, 2018 and 2017 was $296.5 million and $343.2 million. The decrease in the accumulated benefit obligation primarily is a result of an increase in the discount rate and a discretionary contribution to our U.S. plan of $33.2 million to maximize the tax savings allowed under the Tax Act and lower our expenses associated with pension funding regulations going forward.

The accumulated benefit obligation and fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets were $248.8 million and $222.4 million at December 31, 2018 and $287.9 million and $207.7 million at December 31, 2017. The projected benefit obligations and fair value of plan assets of plans with projected benefit obligations in excess of plan assets were $248.8 million and $222.4 million at December 31, 2018 and $288.7 million and $207.7 million at December 31, 2017.

The amount of accumulated other comprehensive income that is expected to be amortized as expense during 2019 is:



Dollar amounts in millions
Net actuarial loss	$	4.7
Prior service cost	0.5
Total	$	5.2

The benefits expected to be paid from the benefit plans, which reflect expected future service, are as follows:



Dollar amounts in millions
Year
2019	$	22.4
2020	20.3
2021	20.4
2022	19.6
2023	20.1
2024– 2028	96.6

These estimated benefit payments are based upon assumptions about future events. Actual benefit payments may vary significantly from these estimates.

The following table sets forth the net periodic pension cost for our defined benefit pension plans. The components of our net periodic pension costs consisted of the following:



	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
Service cost	$	2.6		$	4.9		$	4.3
Other components of net periodic pension cost:
Interest cost	11.1			12.5			13.1
Expected return on plan assets	(13.9		)	(13.1		)	(13.1		)
Amortization of prior service cost and net transition asset	0.5			0.5			0.5
Amortization of net actuarial loss	6.3			6.2			5.4
Net periodic pension cost before loss due to settlement	$	6.6		$	11.0		$	10.2
Loss due to settlement	0.1			3.1			—
	$	6.7		$	14.1		$	10.2

Net periodic pension cost included in cost of sales	$	1.6		$	3.6		$	3.2
Net periodic pension cost included in selling, general, and administrative expenses	1.0			1.3			1.1
Net periodic pension cost included in other non-operating items	4.1			9.2			5.9
	$	6.7		$	14.1		$	10.2

Weighted-average assumptions used to calculate our net periodic pension costs for the year ended December 31:



	2018		2017		2016
Discount rate:
U.S.	3.5	%	4.0	%	4.2	%
Canada	3.3	%	3.7	%	3.8	%
SERP	NA		2.7	%	2.8	%
Expected return on plan assets:
U.S.	5.8	%	5.8	%	5.8	%
Canada	4.1	%	3.8	%	3.8	%
SERP	NA		NA		NA
Rate of compensation increase:
U.S.	NA		NA		NA
Canada	3.5	%	3.5	%	3.5	%
SERP	NA		3.0	%	3.0	%

The expected long-term rate of return on plan assets reflects the weighted-average expected long-term rates of return for the broad categories of investments currently held in the plans (adjusted for expected changes), based on historical rates of return for each broad category, as well as factors that may constrain or enhance returns in the broad categories in the future. The expected long-term rate of return on plan assets is adjusted when there are fundamental changes in expected returns in one or more broad asset categories and when the weighted-average mix of assets in the plans changes significantly.

Asset allocation targets are established based upon the long-term returns and volatility characteristics of the investment classes and recognize the benefits of diversification and the profits of the plans’ liabilities. The actual and target allocations at the measurement dates are as follows:



	Target Allocation 2018		Actual Allocation
	Target Allocation 2018		2018		2017
Asset category
U.S. Plans
Equity securities	33	%	26	%	40	%
Debt securities	50	%	52	%	20	%
Multi-Strategy Funds	17	%	22	%	40	%
Total Allocation for U.S. Plans	100	%	100	%	100	%

Non-U.S. Plans
Equity securities	—	%	—	%	28	%
Debt securities	90	%	90	%	70	%
Multi-Strategy Funds	10	%	10	%	2	%
Total Allocation for Non-U.S. Plans	100	%	100	%	100	%

Our investment policies for the defined benefit pension plans provide target asset allocations by broad categories of investment and ranges of acceptable allocations. These policies are set by an administrative committee with the goal of maximizing long-term investment returns within acceptable levels of volatility and risk. Our U.S. plans include hedge funds and real return investment strategies to increase returns and reduce volatility. Our plans do not currently invest directly in derivative securities, although such investments may be considered in the future to increase returns and/or reduce volatility. To the extent the expected return on plan assets varies from the actual return, an actuarial gain or loss results.

The fair value of our pension plan assets at December 31, 2018 and December 31, 2017, fair value asset categories and the level of inputs as defined in Note 4 are as follows:



Dollar amounts in millions Asset Category	December 31, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Equity investment funds:^(a)
Domestic stock funds:
Measured within the fair value hierarchy	$	22.3	$	22.3	$	—	$	—
Measured at net asset value ^(d)	8.3		—		8.3		—
International stock funds:
Measured within the fair value hierarchy	13.2		13.2		—		—
Measured at net asset value ^(d)	13.7				13.7
Fixed income investment funds:^(b)
Domestic bond funds:
Measured within the fair value hierarchy	27.1		27.1		—		—
Measured at net asset value ^(d)	88.5		3.9		84.6
International bond funds:
Measured within the fair value hierarchy	27.3				27.3
Measured at net asset value ^(d)	20.1		—		20.1		—
Multi-strategy funds:^(c)
Measured within the fair value hierarchy	35.0		35.0		—		—
Measured at net asset value ^(d)	17.8		—		5.1		12.7
Cash & cash equivalents	1.5		—		1.5		—
Total	$	274.8	$	101.5	$	160.6	$	12.7

_______________


^(a)	Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.


^(b)	Fixed income investments include investments in funds that are primarily invested in a diversified portfolio of investment grade U.S. and international debt securities.


^(c)	The multi-strategy funds invest in various hedge funds that employ a fund of funds strategy.


^(d)	Investments for which fair value is measured using the net asset value per share as a practical expedient are not categorized within the fair value hierarchy.



Dollar amounts in millions Asset Category	December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Equity investment funds:^(a)
Domestic stock funds	$	56.2	$	42.2	$	14.0	$	—
International stock funds	43.1		15.5		27.6		—
Fixed income investment funds:^(b)
Domestic bond funds	40.2		20.2		20.0		—
International bond funds	40.9		—		40.9		—
Multi-strategy funds^(c)	82.5		69.6		—		12.9
Cash & cash equivalents	3.0		—		3.0		—
Total	$	265.9	$	147.5	$	105.5	$	12.9

_______________


^(a)	Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.


^(b)	Fixed income investments include investments in funds that are primarily invested in a diversified portfolio of investment grade U.S. and international debt securities.


^(c)	The multi-strategy funds invest in various hedge funds that employ a fund of funds strategy.

Level 1 investments are valued based on active market quotations.

Level 2 investments are valued based on the unit prices quoted by the funds, representing the fair value of underlying investments.

Due to the lack of observable market quotations on real estate and multi-strategy funds, we evaluate our structure and current market estimates of fair value, including fair value estimates from the funds that rely exclusively on Level 3 inputs. These inputs include those that are based on expected cash flow streams and property values, including assessments of overall market liquidity. The valuations are subject to uncertainties that are difficult to predict.

The following table summarizes assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the period.



Dollar amounts in millions	Multi-Strategy Funds
Balance at January 1, 2017	$	12.2
Total unrealized gains	0.7
Contribution (redemption)	0.1
Management fees	(0.1		)
Balance at December 31, 2017	$	12.9
Total unrealized gains	$	(0.2	)
Contribution (redemption)	0.2
Management fees	(0.2		)
Balance at December 31, 2018	$	12.7

Defined Contribution Plans

We also sponsor defined contribution plans in the U.S. and Canada. In the U.S., these plans are primarily 401(k) plans for hourly and salaried employees that allow for pre-tax employee deferrals and a company match of up to 5.0% of an employee’s eligible wages (subject to certain limits). Under the profit sharing feature of these plans, we may elect to contribute a discretionary amount as a percentage of eligible wages. Included in the assets of the 401(k) and profit sharing plans are 1.3 million shares of LP common stock that represented approximately 7.5% of the total market value of plan assets at December 31, 2018.

In Canada, we sponsor both defined contribution plans and Registered Retirement Savings Plans for hourly and salaried employees that allow for tax employee deferrals. We provide a base contribution of 2.5% of eligible earnings and matches 50% of an employee’s deferrals up to a maximum of 3% of each employee’s eligible earnings (subject to certain limits).

Expenses related to defined contribution plans and the multiemployer plan in 2018, 2017 and 2016 were $10.1 million, $9.7 million and $8.7 million.

Other Benefit Plans

We have several plans that provide post-retirement benefits other than pensions, primarily for salaried employees in the U.S. and certain groups of Canadian employees. The funded status at December 31, 2018 and 2017 was $8.6 million and $9.0 million. Net expense related to these plans was not significant in 2018 or 2017.

Effective August 16, 2004, we adopted the Louisiana-Pacific Corporation 2004 Executive Deferred Compensation Plan (the Plan). Pursuant to the Plan, certain management employees are eligible to defer up to 90% of their regular salary and annual cash incentives that exceed the limitation as set forth by the I.R.S. Each plan participant is fully vested in all employee deferred compensation and earnings credited associated with employee contributions. Employer contributions and associated earnings vest over periods not exceeding five years. The liability under this plan amounted to $1.1 million and $1.9 million at December 31, 2018 and December 31, 2017 and is included in “Other long-term liabilities” on LP’s Consolidated Balance Sheets.

Accumulated Comprehensive Loss

12 Months Ended

Dec. 31, 2018

Other Comprehensive Income (Loss), Net of Tax [Abstract]

Other Comprehensive Income (Loss), Net of Tax

ACCUMULATED COMPREHENSIVE INCOME (LOSS)

Accumulated comprehensive loss consists of cumulative translation adjustments, unrealized gains (losses) on certain derivative instruments and pension and post retirement adjustments. Other comprehensive income activity, net of tax, is provided in the following table for the years ended December 31, 2018, 2017 and 2016.



				Pension adjustments
Dollar amounts in millions	Foreign currency translation adjustments			Actuarial losses			Prior service costs			Unrealized gain (loss) on investments			Other			Total
Balance at January 1, 2016	$	(55.1	)	$	(87.8	)	$	(5.5	)	$	3.3		$	(1.0	)	$	(146.1	)
Other comprehensive income (loss) before reclassifications	8.8			(5.3		)	—			(1.0		)	0.4			2.9
Income taxes	—			1.9			—			0.4			(0.1		)	2.2
Net other comprehensive income (loss) before reclassifications	8.8			(3.4		)	—			(0.6		)	0.3			5.1
Amounts reclassified from accumulated comprehensive income (loss)	—			5.5			0.5			—			—			6.0
Income taxes	—			(2.0		)	(0.2		)	—			—			(2.2		)
Net amounts reclassified from cumulative other comprehensive income (loss)	—			3.5			0.3			—			—			3.8
Total other comprehensive income (loss)	8.8			0.1			0.3			(0.6		)	0.3			8.9
Balance at December 31, 2016	(46.3		)	(87.7		)	(5.2		)	2.7			(0.7		)	(137.2		)
Other comprehensive income (loss) before reclassifications	6.6			3.2			—			1.3			(0.9		)	10.2
Income taxes	—			(1.1		)	—			(0.5		)	0.2			(1.4		)
Net other comprehensive income (loss) before reclassifications	6.6			2.1			—			0.8			(0.7		)	8.8
Amounts reclassified from accumulated comprehensive income (loss)	—			9.3			0.5			—			(0.1		)	9.7
Income taxes	—			(3.2		)	(0.2		)	—			—			(3.4		)
Net amounts reclassified from cumulative other comprehensive income (loss)	—			6.1			0.3			—			(0.1		)	6.3
Total other comprehensive income (loss)	6.6			8.2			0.3			0.8			(0.8		)	15.1
Balance at December 31, 2017	(39.7		)	(79.5		)	(4.9		)	3.5			(1.5		)	(122.1		)
Effect of adoption of ASU 2018-02	—			(17.4		)	—			0.7			—			(16.7		)
Other comprehensive income (loss) before reclassifications	(17.3		)	4.1			—			0.1			0.7			(12.4		)
Income taxes	—			(1.1		)	—			—			(0.2		)	(1.3		)
Net other comprehensive income (loss) before reclassifications	(17.3		)	3.0			—			0.1			0.5			(13.7		)
Amounts reclassified from accumulated comprehensive income (loss)	—			7.6			0.5			—			—			8.1
Income taxes	—			(1.9		)	(0.1		)	—			—			(2.0		)
Net amounts reclassified from cumulative other comprehensive income (loss)	—			5.7			0.4			—			—			6.1
Total other comprehensive income (loss)	(17.3		)	8.7			0.4			0.1			0.5			(7.6		)
Balance at December 31, 2018	$	(57.0	)	$	(88.2	)	$	(4.5	)	$	4.3		$	(1.0	)	$	(146.4	)

(a) These accumulated other comprehensive income components are included in the computation of net periodic pension cost, see Note 22 for additional details. The net periodic pension cost is included in Cost of sales, Selling and administrative and Other operating credits and charges, net classifications in the Consolidated Statements of Income.

Foreign currency translation adjustments exclude income tax expense (benefit) given that these adjustments arise out of the translation of assets into the reporting currency that is separate from the taxable income and is deemed to be reinvested for an indefinite period of time. The pension adjustments included an income tax provision of $3.1 million, $4.5 million and $0.3 million in 2018, 2017 and 2016, The unrealized gain (loss) on investments included a tax provision of $0.5 million in 2017 and a benefit of $0.4 million in 2016.

Segment Information

12 Months Ended

Dec. 31, 2018

Segment Reporting Information [Line Items]

Segment Reporting Disclosure [Text Block]

24. SEGMENT INFORMATION

Operating segments are defined as components of an enterprise that engage in business activities and by which discrete financial information is available that is evaluated on a regular basis by the chief operating decision maker to make decisions about how to allocate resources to the segment and assess the performance of the segment. We operate in four segments: Siding; North America Oriented Strand Board (OSB); Engineered Wood Products (EWP) and South America. Our business units have been aggregated into these four segments based upon the similarity of economic characteristics, customers and distribution methods. Our results of operations are summarized below for each of these segments separately as well as for the “other” category which comprises other products that are not individually significant. Segment information was prepared in accordance with the same accounting principles as those described in Note 1. We evaluate the performance of our business segments based upon operating profits excluding other operating credits and charges, net, gain (loss) on sales of and impairments of long-lived assets, general corporate and other expenses, translation gains and losses, interest and income taxes.

The siding segment includes Smart Side^® strand and fiber siding products; CanExel^®siding products; and other related products. The OSB segment includes commodity and value-added OSB products produced in North America. The engineered wood products segment includes laminated veneer lumber, laminated strand lumber; I-joists; plywood; and other related products. The South America segment includes products produced and/or sold (generally OSB, Siding and I-joists) in South America or exported to non-North American countries.

Information about our product segments is as follows:



	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
SALES BY BUSINESS SEGMENT
Siding	$	942.3		$	884.0		$	752.3
OSB	1,305.2			1,302.5			1,027.7
Engineered Wood Products	390.9			365.9			296.9
South America	160.8			155.3			136.9
Other products	28.9			30.0			26.9
Intersegment Sales	(0.1		)	(3.8		)	(7.3		)
Total sales	$	2,828.0		$	2,733.9		$	2,233.4
PROFIT (LOSS) BY BUSINESS SEGMENT
Siding	$	201.6		$	188.7		$	128.0
OSB	395.7			427.3			187.8
Engineered Wood Products	19.5			15.7			(4.6		)
South America	31.0			24.3			17.0
Other products	(4.3		)	(3.4		)	(1.5		)
Other operating credits and charges, net	2.2			(4.9		)	(17.4		)
Gain (loss) on sales of and impairments of long-lived assets	(10.8		)	(6.8		)	8.4
General corporate and other expense, net	(111.7		)	(108.1		)	(102.3		)
Interest expense, net of capitalized interest	(15.8		)	(19.3		)	(32.1		)
Investment income	17.6			10.5			8.2
Other non-operating income (expense)	(3.9		)	(13.8		)	(21.4		)
Income from continuing operations before taxes	521.1			510.2			170.1
Provision for income taxes	122.3			119.1			19.8
Income from continuing operations	$	398.8		$	391.1		$	150.3

	Year ended December 31,
	2018			2017			2016
DEPRECIATION AND AMORTIZATION
Siding	$	32.3		$	30.9		$	27.4
OSB	58.3			61.6			58.6
Engineered Wood Products	15.1			15.8			12.7
South America	9.1			9.1			8.6
Other products	2.0			2.8			2.3
Non-segment related	3.2			3.1			3.2
Total depreciation and amortization	$	120.0		$	123.3		$	112.8

CAPITAL EXPENDITURES
Siding	$	117.1		$	63.0		$	49.9
OSB	54.9			58.4			49.3
Engineered Wood Products	9.9			6.0			5.3



South America	28.3		17.5		8.7
Other products	1.2		1.0		8.1
Non-segment related	2.8		2.7		3.5
Total capital expenditures	$	214.2	$	148.6	$	124.8

Information concerning identifiable assets by segment is as follows:



Dollar amounts in millions	December 31,
Dollar amounts in millions	2018		2016
IDENTIFIABLE ASSETS
Siding	$	487.1	$	371.8
OSB	578.6		577.5
Engineered Wood Products	122.9		116.3
South America	113.6		95.9
Other products	63.6		93.7
Non-segment related	1,148.3		1,193.3
Total assets	$	2,514.1	$	2,448.5

Non-segment related assets include cash and cash equivalents, short-term and long-term investments, corporate assets and other items.

Information concerning our geographic segments is as follows:



	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
GEOGRAPHIC LOCATIONS
Total Sales—Point of origin
U.S.	$	2,409		$	2,307		$	1,882
Canada	861			704			682
South America	174			165			137
Intercompany sales	(616		)	(442		)	(468		)
Total Sales	$	2,828		$	2,734		$	2,233
Operating profit (loss)
U.S.	$	475		$	462		$	239
Canada	138			167			71
South America	31			24			17
Other operating credits and charges, net and gain (loss) on sales of and impairments of long-lived assets	(9		)	(12		)	(9		)
General corporate expense, loss on early debt extinguishment, other income(expense) and interest, net	(114		)	(131		)	(148		)
	521			510			170
Provision for income taxes	122			119			20
Income from continuing operations	$	399		$	391		$	150

IDENTIFIABLE TANGIBLE LONG LIVED ASSETS
U.S.	$	540		$	529		$	516
Canada	449			380			365
South America	84			73			57
Total assets	$	1,073		$	982		$	938

Subsequent Event (Notes)	12 Months Ended
Subsequent Event (Notes)	Dec. 31, 2018
Subsequent Event [Line Items]
Subsequent Events [Text Block]	25. SUBSEQUENT EVENT As of January 15, 2019, LP obtained a controlling financial interest in Entekra based upon LP's ability to add an additional board member to Entekra's Board of Directors. LP will be required to consolidate Entekra's financial results within LP's consolidation financial statements beginning in the first quarter of 2019.

Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 31, 2018
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Nature of Operations [Policy Text Block]	Nature of Operations Louisiana-Pacific Corporation and our subsidiaries are a leading provider of high-performance building solutions. We design, manufacture and market a broad range of products for the new home construction, repair and remodeling and outdoor structures markets. In addition to our U.S. operations, the Company also maintains manufacturing facilities in Canada, Chile and Brazil through foreign subsidiaries and joint ventures. The principal customers for our building products are retail home centers, manufactured housing producers, distributors and wholesalers in North America and South America, with limited sales to Asia, Australia and Europe. References to "LP", "the Company", "we", "our" and "us" refers to Louisiana-Pacific Corporation and its consolidated subsidiaries as a whole. See Note 24 below for further information regarding our products and segments.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with accounting principles generally accepted in the U.S. requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Consolidation, Policy [Policy Text Block]	Consolidation The consolidated financial statements include the accounts of LP and our majority-owned subsidiaries. All intercompany transactions, profits and balances have been eliminated.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and Cash Equivalents Cash and cash equivalents includes cash on hand and short-term investments of 3 months or less when purchased. These investments are stated at cost, which approximates market value.
Investment, Policy [Policy Text Block]	Investments Our long-term investments are classified as available-for-sale and are reported at estimated fair value. Unrealized gains and losses, net of tax, on these investments are reported as a separate component of “Accumulated comprehensive loss” in Stockholders’ Equity until realized. Impairment losses are charged to income for other-than-temporary declines in fair value. Realized gains and losses (including impairments) are recorded in “Investment income” in the Consolidated Statements of Income. For purposes of computing realized gains and losses, cost is identified on a specific identification basis. See Note 4 for further discussion.
Fair Value of Financial Instruments, Policy [Policy Text Block]	Fair Value of Financial Instruments We have, where appropriate, estimated the fair value of financial instruments. These fair value amounts may be significantly affected by the assumptions used, including the discount rate and estimates of cash flows. Accordingly, the estimates presented are not necessarily indicative of the amounts that could be realized in a current market exchange.
Inventory, Policy [Policy Text Block]	Inventory Inventories are valued at the lower of cost or net realizable value. Inventory costs include materials, labor and operating overhead. The LIFO (last-in, first-out) method is used for a minor portion of our log inventories with the remaining inventories valued at FIFO (first-in, first-out) or average cost.
Timber and Timberlands [Policy Text Block]	Timber and Timberlands Timber and timberlands is comprised of timber deeds and allocations of purchase price to Canadian timber harvesting licenses. Timber deeds are transactions in which we purchase timber, but not the underlying land. The cost of timber deeds are capitalized in timber and timberlands and charged to cost of timber harvested as the volume is removed. Timber that has been severed but has not yet been delivered to a facility is included in timber and timberlands. The values associated with timber licenses were allocated in the purchase price allocations for Le Groupe Forex (Forex), Peace Valley OSB, and the assets of Evans Forest Products. These licenses have a life of twenty to twenty-five years. These licenses are amortized on a straight-line basis over the life of the facilities. See Note 8 for further discussion. Canadian timber harvesting licenses also include future requirements for reforestation. The fair value of the future estimated reforestation obligation is accrued and recognized in cost of sales on the basis of the volume of timber harvested; fair value is determined by discounting the estimated future cash flows using a credit adjusted risk-free rate. Subsequent changes to fair value resulting from the passage of time and revisions to fair value calculations are recognized in earnings as they occur.
Property, Plant and Equipment, Policy [Policy Text Block]	Property, Plant and Equipment Property, plant and equipment, including capitalized interest, are recorded at cost. Depreciation is principally calculated by the units of production method for machinery and equipment which amortizes the cost of equipment over the estimated units that will be produced during its useful life. Provisions for depreciation of buildings, land improvements and the remaining machinery and equipment have been computed using straight-line rates based on the estimated service lives. The effective straight-line lives for the principal classes of property range from three to twenty years.
Asset Impairment, Policy [Policy Text Block]	Potential Impairments Long-lived assets to be held and used by us (primarily property, plant and equipment and timber and timberlands) are reviewed for impairment when events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. When impairment is indicated, the book values of the assets are written down to their estimated fair value as calculated by the expected discounted cash flow or estimated net sales price. See Note 17 for a discussion of charges in 2018, 2017 and 2016 related to impairments of property, plant and equipment. Long-lived assets that are held for sale are written down to the estimated sales proceeds less cost to sell unless the estimated net proceeds exceed the carrying value.
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Goodwill and Intangible assets Goodwill is tested for impairment on an annual basis, and when indicators of impairment are determined to exist. Impairment is evaluated by applying a fair value based test. Impairment losses would be recognized whenever the implied fair value of goodwill is less than its carrying value. Intangible assets with finite useful lives are amortized generally on a straight-line basis over the periods benefited. Impairment of the intangible asset is evaluated when factors indicate impairment may exist.
Investments in Affiliates	Investments in Affiliates LP accounts for investments in affiliates when LP does not have a controlling financial interest using the equity method under which LP’s share of earnings and losses of the affiliate is reflected in earnings and dividends are credited against the investment in affiliate when declared. See Note 9 for further discussion.
Restricted Cash, Policy [Policy Text Block]	Restricted Cash Our restricted cash accounts generally secure outstanding letters of credit.
Income Taxes, Policy [Policy Text Block]	Income Taxes We account for income taxes under an asset and liability approach that requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in our financial statements or tax returns. In estimating future tax consequences, we generally consider all expected future events other than the enactment of changes in tax laws or rates. The effect on deferred tax assets and liabilities of a change in tax rates will be recognized as income or expense in the period that includes the enactment date. Additionally, deferred tax assets are reduced by a valuation allowance when it is more likely than not that some portion of the deferred tax assets will not be realized. We recognize liabilities for uncertain tax positions through a two-step process. The first step is to evaluate the tax position for recognition by determining if the weight of the available evidence indicates that it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation process, if any. The second step requires us to estimate and measure the tax benefit as the largest amount that is more than 50% likely to be realized upon ultimate settlement. It is inherently difficult and subjective to estimate such amounts, as LP must determine the probability for various outcomes. LP evaluates these uncertain tax provisions when new information becomes available. These revaluations are based upon factors including, but not limited to, changes in circumstances, changes in tax law, successful settlement of issues under audit and new audit activity. Such a change in recognition or measurement could result in the recognition of a tax benefit or an increase to the related provision. We classify interest related to income taxes liabilities or uncertain tax positions as interest expense or interest income and, if applicable, penalties are recognized as a component of income tax expense. See Note 11 for further discussion of deferred income taxes.
Asset Retirement Obligation [Policy Text Block]	Asset Retirement Obligations We record the fair value of the legal and conditional obligations to retire and remove long-lived assets in the period which the obligation is incurred. These obligations primarily consist of monitoring costs on closed landfills, timber reforestation obligations associated with LP’s timber licenses in Canada and site restoration costs. When the related liability is initially recorded, we capitalize the cost by increasing the carrying amount of the related long-lived asset. Over time, the liability is accreted to its settlement value and the capitalized cost is depreciated over the useful life of the related asset. Upon settlement of the liability, we recognize a gain or loss for any difference between the settlement amount and the liability recorded. See Note 15 for further discussion.
Stock-based Compensation Policy [Policy Text Block]	Stock-Based Compensation We recognize the cost of employee services received in exchange for awards of equity instruments, such as performance shares, restricted stock or restricted stock units and stock-settled stock appreciation rights (SSARs), based upon the fair value of those awards at the date of grant over the requisite service period. See Note 14 for further discussion.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign Currency Translation The functional currency for our Canadian subsidiaries is the U.S. dollar; however, the books and records for these subsidiaries are maintained in the Canadian dollar. The financial statements of these foreign subsidiaries are remeasured into U.S. dollars using the historical exchange rate for property, plant and equipment, timber and timberlands (related depreciation and amortization on both property, plant and equipment and timber and timberlands), goodwill, and certain other non-monetary assets.We use the exchange rate at the balance sheet date for the remaining assets and liabilities, including deferred taxes. A weighted-average exchange rate is used for each period for revenues and expenses. These transaction gains or losses are recorded in “Other non-operating income (expense)” on the Consolidated Statements of Income. The functional currencies of our Argentinean, Brazilian, Chilean, Columbian and Peruvian subsidiaries is the local currency and therefore their books and records are maintained in the local currency. Translation adjustments, which are based upon the exchange rate at the balance sheet date for assets and liabilities and the weighted-average rate for the income statement, are recorded in “Accumulated comprehensive income (loss)” in Stockholders’ equity.
Advertising Costs, Policy [Policy Text Block]	Advertising costs Advertising costs, which amounted to $21.3 million, $19.1 million and $19.6 million in 2018, 2017 and 2016, are principally expensed as incurred. Advertising costs include product displays, media production costs, agency fees, sponsorships and cooperating advertising.
Other operating charges and credits policy [Policy Text Block]	Other Operating Credits and Charges, Net We classify significant amounts unrelated to ongoing core operating activities as “Other operating credits and charges, net” in the Consolidated Statements of Income. Such items include, but are not limited to, amounts related to restructuring charges (including severance charges), charges to establish and maintain litigation or environmental reserves, product reserves, prior year adjustments, retirement charges and gains or losses from settlements with governmental or other organizations. Due to the nature of these items, amounts in the income statement can fluctuate from year to year. The determination of which items are considered significant and unrelated to core operations is based upon management’s judgment. See Note 16 for a discussion of specific amounts in 2018, 2017 and 2016.
Retirement Benefits Policy [Policy Text Block]	Retirement Benefits We are required to use actuarial methods and assumptions in the valuation of defined benefit obligations and the determination of expense. Difference between actual and expected results or changes in the values of the obligations and plan assets are not recognized in earnings as they occur but, rather, systematically and gradually over subsequent periods. See Note 22 for further information.
Comprehensive Income, Policy [Policy Text Block]	Comprehensive Income Comprehensive income consists of net income (loss) and other gains and losses affecting shareholders’ equity that are excluded from net income (loss), including foreign currency translation adjustments, costs associated with pension or other post retirement benefits that have not been recognized as components of net periodic benefit costs, and net unrealized gains or losses on securities and is presented in the accompanying Consolidated Statements of Comprehensive Income. See Note 23 for further discussion.

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventory



	December 31,
Dollar amounts in millions	2018		2017
Logs	$	56.9	$	60.3
Other raw materials	24.8		20.8
Semi finished inventory	23.4		24.3
Finished products	167.9		153.7
Total	$	273.0	$	259.1

Depreciation expense [Table Text Block]

Depreciation expense can be attributed to Cost of sales and Selling and administrative as noted below:



Dollar amounts in millions	Years ended December 31,
Dollar amounts in millions	2018		2017		2016
Cost of sales	$	116.8	$	120.1	$	109.6
Selling and administrative	3.2		3.2		3.2
Total depreciation and amortization	$	120.0	$	123.3	$	112.8

Property, Plant and Equipment [Table Text Block]

Plant, property and equipment, net consists of the following:



Dollar amounts in millions	December 31,
Dollar amounts in millions	2018			2017
Property, plant and equipment, at cost:
Land, land improvements and logging roads, net of road amortization	$	168.6		$	162.7
Buildings	329.9			347.5
Machinery and equipment	1,949.0			1,977.4
Construction in progress	148.1			98.5
	2,595.6			2,586.1
Accumulated depreciation	(1,585.2		)	(1,660.0		)
Property, plant and equipment, net	$	1,010.4		$	926.1

Present and Prospective Accounting Pronouncements (Tables)

12 Months Ended

Dec. 31, 2018

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

The cumulative effect of the changes made to our Consolidated Balance Sheet as of January 1, 2018 for the adoption of ASU 2014-09 and ASU 2018-02, were as follows:



Dollar amounts in millions	Balance at December 31, 2017			ASU 2014-09			ASU 2018-02			Balance at January 1, 2018
Receivables, net of allowance for doubtful accounts	$	142.5		$	(21.7	)	$	—		$	120.8
Inventories	259.1			15.8			—			274.9
Deferred tax asset	2.5			1.5			—			4.0

Retained earnings	1,280.1			(4.4		)	16.7			1,292.4
Accumulated comprehensive loss	(122.1		)	—			(16.7		)	(138.8		)

In accordance with the new revenue standard requirements, the disclosure of the impact on our Consolidated Statement of Income and Consolidated Balance Sheet is as follows:



	Year ended December 31, 2018
Dollar amounts in millions	As reported		Balances without adoption of ASC 606		Effect of Change Higher (Lower)
Consolidated Statement of Income
Net sales	$	2,828.0	$	2,829.6	$	(1.6	)
Cost of sales	2,084.0		2,082.0		2.0
Selling, general and administrative expenses	209.3		213.8		(4.5		)
Provision for income taxes	122.3		122.1		0.2
Net income	394.6		393.9		0.7

Consolidated Balance Sheet	December 31, 2018
Receivables, net of allowance for doubtful accounts	$	127.6	$	146.6	$	(19.0	)
Inventory	$	273.0	$	259.2	$	13.8
Income taxes payable	$	21.0	$	22.3	$	(1.3	)
Retained earnings	$	1,612.6	$	1,616.3	$	(3.7	)

On January 1, 2018, we adopted ASU 2017-07, "Retirement Benefits - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost" (an amendment to ASC 715), to improve the presentation of net periodic pension and postretirement benefit costs. We retrospectively adopted the presentation of service cost separate from the other components of net periodic costs. The interest cost, expected return on assets, amortization of prior service costs, amortization of net actuarial losses and settlement costs have been reclassified from Cost of sales, Selling, general and administrative expenses and Other operating credits and charges to Non-operating income (expense). We elected to apply the practical expedient which allows us to reclassify amounts disclosed previously in the retirement benefits note as the basis for applying retrospective presentation for comparative periods as it is impracticable to determine the disaggregation of the cost components for amounts capitalized and amortized in those periods. On a prospective basis, the other components of net periodic benefit costs (excluding service cost) will not be included in amounts capitalized in inventory or property, plant, and equipment.

In addition to the effects of ASU 2017-07, we have reclassified depreciation and amortization into the financial statement caption that reflects the category of the expense to be more comparable with our peers.

The effect of the retrospective presentation change related to the net periodic cost of our defined benefit pension and postretirement plans and the reclassification of depreciation and amortization on our Consolidated Statement of Income for the years ended December 31, 2017 and 2016 is as follows:



	Year ended December 31, 2017
Dollar amounts in millions	As reported			ASU 2017-07			Reclassifications			As adjusted
Consolidated Statement of Income
Cost of sales (exclusive of depreciation and amortization shown separately below)	$	1,882.0		$	(4.0	)	$	120.1		$	1,998.1
Depreciation and amortization	123.3			—			(123.3		)	—
Selling, general and administrative expenses	190.4			(2.3		)	3.2			191.3
Other operating credits and charges, net	8.0			(3.1		)	—			4.9
Income from operations	523.4			9.4			—			532.8
Total non-operating income (expense)	(13.2		)	(9.4		)	—			(22.6		)



	Year ended December 31, 2016
Dollar amounts in millions	As reported			ASU 2017-07			Reclassifications		As adjusted
Consolidated Statement of Income
Cost of sales (exclusive of depreciation and amortization shown separately below)	$	1,724.0		$	(4.5	)	109.6		$	1,829.1
Depreciation and amortization	112.8						(112.8	)	—
Selling, general and administrative expenses	183.6			(1.7		)	3.2		185.1
Income from operations	204.0			6.2			—		210.2
Total non-operating income (expense)	(39.1		)	(6.2		)	—		(45.3		)

On January 1, 2018, we adopted ASU 2016-18, "Statement of Cash Flows (Topic 230): Restricted Cash." The adoption of this standard requires the inclusion of the change in amounts described as restricted cash or restricted cash equivalents to be included as part of our Consolidated Statement of Cash Flows.

In accordance with disclosure requirements of this new accounting standard, the impact of adoption on our Consolidated Statement of Cash Flows for the years ended December 31, 2017 and 2016 is as follows:



	Year ended December 31, 2017
Dollar amounts in millions	As reported			ASU 2016-18		As adjusted
Consolidated Statement of Cash Flows
Net cash provided by (used in) investing activities	$	(198.6	)	$	—	$	(198.6	)
Effect of exchange rate on cash, cash equivalents and restricted cash	3.0			0.1		3.1
Net increase in cash, cash equivalents and restricted cash	268.7			0.1		268.8
Cash, cash equivalents and restricted cash at beginning of period	659.3			13.2		672.5
Cash, cash equivalents and restricted cash at end of period	928.0			13.3		941.3



	Year ended December 31, 2016
Dollar amounts in millions	As reported		ASU 2016-18			As adjusted
Consolidated Statement of Cash Flows
Net cash provided by (used in) investing activities	$	286.3	$	(1.2	)	$	285.1
Effect of exchange rate on cash, cash equivalents and restricted cash	3.0		0.1			3.1
Net increase in cash, cash equivalents and restricted cash	224.6		(1.1		)	223.5
Cash, cash equivalents and restricted cash at beginning of period	434.7		14.3			449.0
Cash, cash equivalents and restricted cash at end of period	659.3		13.2			672.5

Revenue (Tables)

12 Months Ended

Dec. 31, 2018

Disaggregation of Revenue [Line Items]

Disaggregation of Revenue [Table Text Block]

The following tables disaggregate our revenue by product line and product type by segment for the years ended December 31:



Year Ended December 31, 2018
By Product family:	Siding		OSB		EWP		South America		Other		Inter-segment			Total
SmartSide^® Strand siding	$	724.8	$	—	$	—	$	21.5	$	—	$	—		$	746.3
SmartSide^® Fiber siding	106.4		—		—		—		—		—			106.4
CanExel^® siding	37.3		—		—		—		—		—			37.3
OSB - commodity	39.4		746.0		9.9		—		—		(0.1		)	795.2
OSB - value-add	22.5		550.9		13.9		135.2		—		—			722.5
LVL	—		—		140.9		—		—		—			140.9
LSL	—		—		59.2		—		—		—			59.2
I-joist	—		—		122.1		—		—		—			122.1
Plywood	—		—		28.7		—		—		—			28.7
Other	11.9		8.3		16.2		4.1		28.9		—			69.4
	$	942.3	$	1,305.2	$	390.9	$	160.8	$	28.9	$	(0.1	)	$	2,828.0
By Product type:
Commodity	$	39.4	$	746.0	$	38.6	$	—	$	—	$	(0.1	)	$	823.9
Value-add	891.0		550.9		336.1		156.7		—		—			1,934.7
Other	11.9		8.3		16.2		4.1		28.9		—			69.4
	$	942.3	$	1,305.2	$	390.9	$	160.8	$	28.9	$	(0.1	)	$	2,828.0



Year Ended December 31, 2017
By Product family:	Siding		OSB		EWP		South America		Other		Inter-segment			Total
SmartSide^® Strand siding	$	646.3	$	—	$	—	$	19.7	$	—	$	(3.6	)	$	662.4
SmartSide^® Fiber siding	111.3		—		—		—		—		—			111.3
CanExel^® siding	49.4		—		—		—		—		—			49.4
OSB - commodity	66.9		765.5		9.4		—		—		—			841.8
OSB - value-add	—		524.7		13.2		131.7		—		—			669.6
LVL	—		—		144.3		—		—		—			144.3
LSL	—		—		46.8		—		—		(0.1		)	46.7
I-joist	—		—		116.9		—		—		(0.1		)	116.8
Plywood	—		—		25.1		—		—		—			25.1
Other	10.1		12.3		10.2		3.9		30.0		—			66.5
	$	884.0	$	1,302.5	$	365.9	$	155.3	$	30.0	$	(3.8	)	$	2,733.9
By Product type:
Commodity	$	66.9	$	765.5	$	34.5	$	—	$	—	$	—		$	866.9
Value-add	807.0		524.7		321.2		151.4		—		(3.8		)	1,800.5
Other	10.1		12.3		10.2		3.9		30.0		—			66.5
	$	884.0	$	1,302.5	$	365.9	$	155.3	$	30.0	$	(3.8	)	$	2,733.9



Year Ended December 31, 2016
By Product family:	Siding		OSB		EWP		South America		Other		Inter-segment			Total
SmartSide^® Strand siding	$	549.5	$	—	$	—	$	19.6	$	—	$	(1.5	)	$	567.6
SmartSide^® Fiber siding	108.1		—		—		—		—		—			108.1
CanExel^® siding	43.2		—		—		—		—		—			43.2
OSB - commodity	40.8		626.0		0.1		—		—		(5.8		)	661.1
OSB - value-add	1.8		390.3		10.7		112.3		—		—			515.1
LVL	—		—		122.1		—		—		—			122.1
LSL	—		—		37.8		—		—		—			37.8
I-joist	—		—		99.4		—		—		—			99.4
Plywood	—		—		15.8		—		—		—			15.8
Other	8.9		11.4		11.0		5.0		26.9		—			63.2
	$	752.3	$	1,027.7	$	296.9	$	136.9	$	26.9	$	(7.3	)	$	2,233.4
By Product type:
Commodity	$	40.8	$	626.0	$	15.9	$	—	$	—	$	(5.8	)	$	676.9
Value-add	702.6		390.3		270.0		131.9		—		(1.5		)	1,493.3
Other	8.9		11.4		11.0		5.0		26.9		—			63.2
	$	752.3	$	1,027.7	$	296.9	$	136.9	$	26.9	$	(7.3	)	$	2,233.4

Investments (Tables)

12 Months Ended

Dec. 31, 2018

Investments [Abstract]

Unrealized Gain (Loss) on Investments [Table Text Block]

The following table summarizes unrealized gains and losses related to these investments as of December 31, 2018 and December 31, 2017:



Dollar amounts in millions	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
December 31, 2018	$	0.4	$	5.7	$	—	$	6.1

December 31, 2017	$	0.4	$	5.6	$	—	$	6.0

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value, Measurement Inputs, Disclosure [Table Text Block]

Assets and liabilities measured at fair value on a recurring basis as of December 31, 2018 and 2017 is summarized in the following tables.



Dollar amounts in millions	December 31, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Available for sale securities	$	6.1	$	—	$	—	$	6.1
Trading securities	3.1		3.1		—		—



Dollar amounts in millions	December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Available for sale securities	$	6.0	$	—	$	—	$	6.0
Trading securities	3.1		3.1		—		—

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]



Dollar amounts in millions	Available for sale securities
Balance at December 31, 2016	$	4.8
Total realized/unrealized gains
Included in other comprehensive income	1.2
Balance at December 31, 2017	$	6.0
Return of principal on ARS	0.4
Total realized/unrealized gains
Included in investment income	(0.4		)
Included in other comprehensive income	0.1
Balance at December 31, 2018	$	6.1

Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The following table sets forth the computation of basic and diluted earnings per share:



	Year ended December 31,
Share amounts in millions	2018	2017	2016
Denominator for basic earnings per share:
Weighted average common shares outstanding	143.0	144.4	143.4
Effect of dilutive securities:
Dilutive effect of employee stock plans	1.4	2.0	1.7
Dilutive effect of stock warrants	—	—	0.2
Dilutive potential common shares	1.4	2.0	1.9
Denominator for diluted earnings per share:
Adjusted weighted average shares	144.4	146.4	145.3

Receivables (Tables)

12 Months Ended

Dec. 31, 2018

Receivables [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

Receivables consist of the following:



	December 31,
Dollar amounts in millions	2018			2017
Trade receivables	$	86.7		$	124.6
Income tax receivable	16.3			2.2
Other receivables	25.4			16.6
Allowance for doubtful accounts	(0.8		)	(0.9		)
	$	127.6		$	142.5

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Other Intangible Assets [Abstract]

Schedule of Goodwill [Table Text Block]

Changes in goodwill and other intangible assets for the year ended December 31, 2018 and 2017 are provided in the following table:



Dollar amounts in millions	2018											2017
	Timber and timberlands			Goodwill		Developed Technology			Total			Timber and timberlands			Goodwill		Developed Technology			Total
Beginning balance December 31,	$	43.9		$	16.1	$	10.6		$	70.6		$	47.1		$	9.7	—			$	56.8
Additions	—			—		—			—			—			6.4		11.0			17.4
Amortization	(3.2		)	—		(0.5		)	(3.7		)	(3.2		)	—		(0.4		)	(3.6		)
Total goodwill and other intangibles	$	40.7		$	16.1	$	10.1		$	66.9		$	43.9		$	16.1	$	10.6		$	70.6

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Amortization of the above intangible assets over the next five years is as follows:



Dollar amounts in millions
Year ended December 31,
2019	$	3.8
2020	3.8
2021	3.8
2022	3.8
2023	3.8

Accounts Payable and Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Accounts Payable and Accrued Liabilities [Abstract]

Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]

Accounts payable and accrued liabilities were as follows:



	December 31,
Dollar amounts in millions	2018		2017
Accounts payable	$	116.1	$	112.3
Salaries and wages payable	64.1		75.8
Taxes other than income taxes	3.5		3.0
Current portion of warranty reserves	3.0		9.0
Accrued interest	6.8		6.0
Accrued rebates	30.1		24.2
Other accrued liabilities	9.7		6.8
Total Accounts payable and accrued liabilities	$	233.3	$	237.1

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

from continuing operations before income taxes consists of the following:



	Year ended December 31,
Dollar amounts in millions	2018		2017		2016
Domestic	$	359.1	$	341.8	$	98.4
Foreign	162.0		168.4		71.7
Total	$	521.1	$	510.2	$	170.1

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]



	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
Current tax provision (benefit):
U.S. federal	$	55.5		$	105.8		$	60.4
State and local	8.4			4.4			4.4
Foreign	31.7			7.9			10.4
Net current tax provision (benefit)	95.6			118.1			75.2
Deferred tax provision (benefit):
U.S. federal	11.2			(19.3		)	(48.1		)
State and local	5.8			8.0			1.2
Foreign	11.1			38.2			11.7
Net valuation allowance increase (decrease)	(1.4		)	(25.9		)	(20.2		)
Net deferred tax benefit	26.7			1.0			(55.4		)
Total income tax provision (benefit)	$	122.3		$	119.1		$	19.8

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

The tax effects of significant temporary differences creating deferred tax assets and liabilities were as follows:



	December 31,
Dollar amounts in millions	2018			2017 ¹
Accrued liabilities	$	21.4		$	26.6
Pension and post-retirement benefits	8.3			19.9
Share-based compensation	5.3			6.9
Benefit of capital loss and NOL carryovers	15.8			38.9
Other	13.1			10.2
Inventories	7.7			6.6
Market value write down of ARS	3.3			4.9
Benefit of tax credit carryovers	0.4			3.5
Valuation allowance	(12.0		)	(13.6		)
Total deferred tax assets	63.3			103.9
Property, plant and equipment	(111.8		)	(118.2		)
Timber and timberlands	(9.8		)	(11.4		)
Installment sale gain deferral	—			(5.2		)
Total deferred tax liabilities	(121.6		)	(134.8		)
Net deferred tax liabilities	$	(58.3	)	$	(30.9	)
Balance sheet classification
Long-term deferred tax asset	3.9			2.5
Long-term deferred tax liability	(62.2		)	(33.4		)
	$	(58.3	)	$	(30.9	)

Summary of Tax Credit Carryforwards [Table Text Block]

The benefit relating to capital loss, net operating loss (NOL) and credit carryovers included in the above table at December 31, 2018 consists of:



Dollar amounts in millions	Expiration Beginning in	Benefit Amount		Valuation Allowance
State NOL carryovers	2020	$	9.9	$	(0.5	)
State credit carryovers	2019	0.3		(0.1		)
Canadian capital loss carryovers	Indefinitely	5.7		(5.7		)
Canadian credit carryovers	2026	0.1		—
Chilean NOL carryovers	Indefinitely	0.2		(0.2		)
		$	16.2	$	(6.5	)

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

The following table summarizes the differences between the statutory U.S. federal and effective income tax rates on continuing operations:



	Year ended December 31,
	2018		2017		2016
U.S. federal tax rate	21	%	35	%	35	%
State and local income taxes	3		2		2
Effect of foreign tax rates	2		(3	)	(5	)
Effect of foreign exchange on functional currencies	(1	)	1		2
Tax credits	(1	)	(1	)	(12	)
Capital gain - timber	—		—		(15	)
Stock-based compensation	(1	)	—		(2	)
Domestic manufacturing deduction	—		(2	)	(2	)
Valuation allowance	—		(6	)	(12	)
Uncertain tax positions	—		1		21
Effect of U.S. federal rate change on deferred taxes	(1	)	(3	)	—
Other, net	1		(1	)	—
Effective tax rate (%)	23	%	23	%	12	%

Summary of Income Tax Contingencies [Table Text Block]



	December 31,
Dollar amounts in millions	2018			2017			2016
Beginning balance	$	40.3		$	39.8		$	4.1
Increases:
Tax positions taken in current year	0.7			0.6			26.9
Tax positions taken in prior years	0.7			1.2			10.4
Decreases:
Tax positions taken in current year	—			—			—
Tax positions taken in prior years	—			(1.3		)	—
Settlements during the year	(0.9		)	—			—
Lapse of statute in current year	—			—			(1.6		)
Ending balance	$	40.8		$	40.3		$	39.8

Non-operating Income (Expense) (Tables)

12 Months Ended

Dec. 31, 2018

Nonoperating Income (Expense) [Abstract]

Schedule of Other Nonoperating Income (Expense) [Table Text Block]



	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
Interest expense	$	(19.0	)	$	(20.6	)	$	(32.9	)
Amortization of debt charges	(0.8		)	(0.9		)	(1.1		)
Capitalized interest	4.0			2.2			1.9
Interest expense, net of capitalized interest	(15.8		)	(19.3		)	(32.1		)
Interest income	18.1			9.5			8.0
Gain on securities	0.4			—			—
SERP market adjustments	(0.9		)	1.0			0.2
Investment income	17.6			10.5			8.2
Net periodic pension cost, excluding service cost	(4.3		)	(9.4		)	(6.2		)
Foreign currency losses	0.4			(4.4		)	2.1
Early debt extinguishment	—			—			(17.3		)
Other non-operating income (expense)	(3.9		)	(13.8		)	(21.4		)
Total non-operating income (expense)	$	(2.1	)	$	(22.6	)	$	(45.3	)

Long-term Debt (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]



	December 31,
Dollar amounts in millions	2018											2017
	Interest Rate		Principal			Unamortized Debt Costs			Total			Principal			Unamortized Debt Costs			Total
Debentures:
Senior unsecured notes, maturing 2024, interest rates fixed	4.875	%	$	350.0		$	(3.7	)	$	346.3		$	350.0		$	(4.4	)	$	345.6
Bank credit facilities:
Chilean term credit facility, maturing 2019, interest rates fixed	UF+3.9%		4.7			(0.1		)	4.6			7.7			(0.1		)	7.6
Limited recourse notes payable:
Senior notes, payable matured 2018, interest rates fixed	7.3	%	—			—			—			22.0			—			22.0
Other financing:
Capital leases			1.0			—			1.0			0.7			—			0.7
Total			355.7			(3.8		)	351.9			380.4			(4.5		)	375.9
Less: current portion			(5.0		)	—			(5.0		)	(25.1		)	—			(25.1		)
Net long-term portion			$	350.7		$	(3.8	)	$	346.9		$	355.3		$	(4.5	)	$	350.8

Schedule of Maturities of Long-term Debt [Table Text Block]

The weighted average interest rate for all long-term debt at December 31, 2018 and 2017 was approximately 4.9% and 5.1% . Required repayment of principal for long-term debt is as follows:



Dollar amounts in millions
Years ending December 31,
2019	$	5.2
2020	0.2
2021	0.2
2022	0.1
2023	—
2024 and after	350.0
Total	$	355.7

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644

+ Details

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

Common Stock Plan



	Year ended December 31,
Dollar amounts in millions	2018		2017		2016
Total stock-based compensation expense (costs of sales, selling, general and administrative and other operating credits and charges, net)	$	8.6	$	9.7	$	13.0
Income tax benefit related to stock-based compensation	$	3.1	$	0.8	$	3.4
Impact on cash flow due to taxes paid related to net share settlement of equity awards	$	9.3	$	5.9	$	9.2

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The following table sets out the weighted average assumptions used to estimate the fair value of the SSARs granted using the Black-Scholes option-pricing model:



	2017			2016
Expected stock price volatility	41		%	45		%
The fair values of stock-based payments were valued using the Black-Scholes valuation method with a volatility factor based on our historical stock prices.
Expected dividend yield	—		%	—		%
The Black-Scholes valuation model calls for a single expected dividend yield as an input. This is determined based upon current annual dividend as of the date of grant compared to the grant price.
Risk-free interest rate	2.1		%	1.4		%
We base the risk-free interest rate used in the Black-Scholes valuation method on U.S. Treasury issues with an equivalent term. Where the expected term of our stock-based awards do not correspond with the terms for which interest rates are quoted, we perform a straight-line interpolation to determine the rate from the available maturities.
Expected life of options (in years)	6 years			6 years
Expected life represents the period that LP’s stock-based awards are expected to be outstanding and was determined based on historical experience of similar awards, giving consideration to the contractual terms of the stock-based awards, vesting schedules and expectations of future employee behavior as influenced by changes to the terms of its stock-based awards.
Weighted average fair value of options and SSARs granted	$	8.02		$	6.99

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

The following table summarizes stock awards as of December 31, 2018 as well as activity during the last year.



	Stock Options / SSARS					Restricted stock					Restricted units
	Number of Awards			Weighted Average Exercise Price		Number of Awards			Weighted Average Grant Date Fair Value		Number of Awards			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2017	2,404,808			$	14.76	311,215			$	17.33	851,244			$	18.93
Granted	—			—		—			—		491,114			27.74
Exercised	(1,201,644		)	13.91		—			—		—			—
Vested	—			—		(64,747		)	17.04		(217,000		)	17.95
Forfeited	(61,478		)	17.51		(6,294		)	16.80		(168,744		)	21.59
Outstanding at December 31, 2018	1,141,686			$	15.50	240,174			$	17.43	956,614			$	23.17
Vested and expected to vest at December 31, 2018⁽¹⁾	1,084,602			$	15.50	228,165			$	17.43	908,783			$	23.17
Exercisable at December 31, 2018	870,431			$	14.83	—			—		—			$	—
Unrecognized compensation costs (in millions)	$	0.5				$	0.7				$	9.7
to be recognized over weighted average period of years	0.8					0.6					1.3

_______________


⁽¹⁾	Expected to vest based upon historical forfeiture rate

Asset Retirement Obligation (Tables)

12 Months Ended

Dec. 31, 2018

ASSET RETIREMENT OBLIGATIONS [Abstract]

Schedule of Change in Asset Retirement Obligation [Table Text Block]



Dollar amounts in millions	Year ended December 31,
Dollar amounts in millions	2018			2017
Beginning balance	$	10.8		$	10.2
Accretion expense	0.9			0.8
Adjusted to expense during the year	1.6			—
Adjusted to other operating credits and charges, net	(0.8		)	—
Payments made	(0.4		)	(0.3		)
Translation	(0.1		)	0.1
Ending balance	$	12.0		$	10.8

Other Operating Credits and Charges, Net (Tables)

12 Months Ended

Dec. 31, 2018

Other Operating Credits And Charges, Net [Abstract]

Other Operating Credits and Charges Net [Table Text Block]



Dollar amounts in millions	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
Reorganization charges	$	(10.3	)	$	—		$	—
Refund of sales and use taxes	0.5			0.8			—
Refund of environmental costs	8.3			—			—
Loss on workers compensation reserve	—			(0.9		)	—
Adjustment to product related warranty reserves	7.7			(5.4		)	(16.9		)
Expenses related to hurricane	(4.5		)	—			—
Other	0.5			0.6			(0.5		)
	$	2.2		$	(4.9	)	$	(17.4	)

Restructuring Cost and Reserve [Line Items]

Restructuring and Related Costs [Table Text Block]

Severance



Dollar amounts in millions	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
Beginning balance at December 31,	$	1.7		$	0.2		$	0.2
Accrued to expense during the year	0.3			3.7			0.5
Accrued to other operating credits and charges, net	10.3			—			—
Payments	(6.8		)	(2.2		)	(0.5		)
Ending balance	$	5.5		$	1.7		$	0.2

Gain (loss) on sales or impairment of long lived assets (Tables)

12 Months Ended

Dec. 31, 2018

GAIN (LOSS) ON SALE OF AND IMPAIRMENT OF LONG-LIVED ASSETS, NET [Abstract]

gain or loss on sale or impairment on assets [Table Text Block]



Dollar amounts in millions	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
Impairment charges on long-lived assets	$	(10.7	)	$	(9.1	)	$	(0.8	)
Gain (loss) on sale or other disposition of other long-lived assets	(0.1		)	2.3			9.2
	$	(10.8	)	$	(6.8	)	$	8.4

Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Loss Contingencies by Contingency [Table Text Block]

maintain reserves for various contingent liabilities as follows:



	December 31,
Dollar amounts in millions	2018			2017
Environmental reserves	$	10.6		$	15.0
Other reserves	0.2			0.1
Total contingencies	10.8			15.1
Current portion	(2.3		)	(3.4		)
Long-term portion	$	8.5		$	11.7

Schedule of Environmental Loss Contingencies by Site [Table Text Block]

The activity in our reserve for estimated environmental loss contingency reserves for the last three years is summarized in the following table.



	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
Beginning balance	$	15.0		$	15.9		$	16.6
Adjusted to expense (income) during the year	(2.1		)	1.2			0.7
Payments made	(2.2		)	(2.1		)	(1.4		)
Translation	(0.1		)	—			—
Ending balance	$	10.6		$	15.0		$	15.9

- Definition

Tabular disclosure of the loss contingencies that were reported in the period or disclosed as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Committments and Contingent Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block]

At December 31, 2018, future minimum commitments are as follows:



Dollar amounts in millions
Year ended December 31,
2019	$	8.4
2020	7.3
2021	4.6
2022	1.8
2023	—
2024 and thereafter	—
Total	$	22.1

Product Warranty (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

The activity in warranty reserves for the last three years is summarized in the following table.



	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
Beginning balance	$	24.7		$	24.1		$	21.0
Accrued to expense during the year	1.0			1.0			0.8
Accrued/ (credited) to other operating credits and charges	(7.7		)	5.4			16.9
Accrued to discontinued operations	5.0			1.5			0.5
Foreign currency translation	(0.7		)	2.2			(0.2		)
Payments made	(8.8		)	(9.5		)	(14.9		)
Total warranty reserves	13.5			24.7			24.1
Current portion of warranty reserves	(3.0		)	(9.0		)	(9.0		)
Long term portion of warranty reserves	$	10.5		$	15.7		$	15.1

Discontinued Operations Sales and Operating Profit in Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2018

Discontinued Operations and Disposal Groups [Abstract]

Sales and Operating Profit in Discontinued Operations [Table Text Block]



Dollar amounts in millions	2018			2017			2016
Operating loss	$	(5.6	)	$	(2.0	)	$	(0.8	)
Cash provided by (used in) operations from discontinued operations	(6.7		)	(1.8		)	(2.6		)

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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+ Details

Retirement Plans and Post Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2018

Retirement Benefits [Abstract]

Schedule of Net Funded Status and Assumptions Used in Calculating Benefit Obligation [Table Text Block]



Dollar amounts in millions	2018			2017
Change in benefit obligation:
Beginning of year balance	$	345.5		$	331.9
Service cost	2.6			4.9
Interest cost	11.1			12.5
Actuarial loss	(24.5		)	10.8
Curtailment	(1.3		)	—
Foreign exchange rate changes	(4.5		)	3.6
Benefits paid	(32.2		)	(18.2		)
End of year balance	$	296.7		$	345.5
Change in assets (fair value):
Beginning of year balance	$	265.9		$	239.9
Actual return on plan assets	(7.3		)	27.8
Employer contribution	52.9			12.7
Foreign exchange rate changes	(4.5		)	3.7
Benefits paid	(32.2		)	(18.2		)
End of year balance	$	274.8		$	265.9
Funded status:
Plan assets (less than) over benefit obligations:	$	(21.9	)	$	(79.6	)

Amounts included in the balance sheet:
Noncurrent pension assets, included in “Other assets”	$	4.5		$	1.4
Current pension liabilities, included in “Accounts payable and accrued liabilities”	(3.1		)	(12.1		)
Noncurrent pension liabilities, included in “Other long-term liabilities”	(23.3		)	(68.9		)
Net amount recognized	$	(21.9	)	$	(79.6	)

Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

The pretax amounts recognized in Accumulated other comprehensive loss were as follows:



Dollar amounts in millions	Actuarial losses			Prior service cost			Total
December 31, 2016	$	(140.6	)	$	(8.4	)	$	(149.0	)
Other comprehensive income (loss) before reclassifications	3.2			—			3.2
Amounts reclassified from accumulated comprehensive loss	9.3			0.5			9.8
December 31, 2017	(128.1		)	(7.9		)	(136.0		)
Other comprehensive income (loss) before reclassifications	4.1			—			4.1
Amounts reclassified from accumulated comprehensive loss	7.6			0.5			8.1
December 31, 2018	$	(116.4	)	$	(7.4	)	$	(123.8	)

Schedule of Assumptions Used [Table Text Block]

Weighted-average assumptions used to calculate our benefit obligations at December 31:



	2018		2017
Discount rate:
US	4.2	%	3.5	%
Canada	3.8	%	3.3	%
SERP	NA		2.9	%
Rate of compensation increase:
US	NA		NA
Canada	3.5	%	3.5	%
SERP	NA		3.0	%

Schedule of benefit obligation by plan category [Table Text Block]

Benefit obligations by plan category are as follows:



	2018
Dollar amounts in millions	US			Canada		SERP			Total
Fair value of plan assets	$	222.4		$	52.4	$	—		$	274.8
Benefit obligation	244.8			49.0		2.9			296.7
Funded Status	$	(22.4	)	$	3.4	$	(2.9	)	$	(21.9	)

	2017
	US			Canada		SERP			Total
Fair value of plan assets	$	207.7		$	58.2	$	—		$	265.9
Benefit obligation	272.6			58.1		14.8			345.5
Funded Status	$	(64.9	)	$	0.1	$	(14.8	)	$	(79.6	)

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

The amount of accumulated other comprehensive income that is expected to be amortized as expense during 2019 is:



Dollar amounts in millions
Net actuarial loss	$	4.7
Prior service cost	0.5
Total	$	5.2

Schedule of Expected Benefit Payments [Table Text Block]

The benefits expected to be paid from the benefit plans, which reflect expected future service, are as follows:



Dollar amounts in millions
Year
2019	$	22.4
2020	20.3
2021	20.4
2022	19.6
2023	20.1
2024– 2028	96.6

Schedule of Net Benefit Costs [Table Text Block]

The following table sets forth the net periodic pension cost for our defined benefit pension plans. The components of our net periodic pension costs consisted of the following:



	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
Service cost	$	2.6		$	4.9		$	4.3
Other components of net periodic pension cost:
Interest cost	11.1			12.5			13.1
Expected return on plan assets	(13.9		)	(13.1		)	(13.1		)
Amortization of prior service cost and net transition asset	0.5			0.5			0.5
Amortization of net actuarial loss	6.3			6.2			5.4
Net periodic pension cost before loss due to settlement	$	6.6		$	11.0		$	10.2
Loss due to settlement	0.1			3.1			—
	$	6.7		$	14.1		$	10.2

Net periodic pension cost included in cost of sales	$	1.6		$	3.6		$	3.2
Net periodic pension cost included in selling, general, and administrative expenses	1.0			1.3			1.1
Net periodic pension cost included in other non-operating items	4.1			9.2			5.9
	$	6.7		$	14.1		$	10.2

Weighted-average assumptions used to calculate our net periodic pension costs for the year ended December 31:



	2018		2017		2016
Discount rate:
U.S.	3.5	%	4.0	%	4.2	%
Canada	3.3	%	3.7	%	3.8	%
SERP	NA		2.7	%	2.8	%
Expected return on plan assets:
U.S.	5.8	%	5.8	%	5.8	%
Canada	4.1	%	3.8	%	3.8	%
SERP	NA		NA		NA
Rate of compensation increase:
U.S.	NA		NA		NA
Canada	3.5	%	3.5	%	3.5	%
SERP	NA		3.0	%	3.0	%

Schedule of Allocation of Plan Assets [Table Text Block]

The actual and target allocations at the measurement dates are as follows:



	Target Allocation 2018		Actual Allocation
	Target Allocation 2018		2018		2017
Asset category
U.S. Plans
Equity securities	33	%	26	%	40	%
Debt securities	50	%	52	%	20	%
Multi-Strategy Funds	17	%	22	%	40	%
Total Allocation for U.S. Plans	100	%	100	%	100	%

Non-U.S. Plans
Equity securities	—	%	—	%	28	%
Debt securities	90	%	90	%	70	%
Multi-Strategy Funds	10	%	10	%	2	%
Total Allocation for Non-U.S. Plans	100	%	100	%	100	%

The fair value of our pension plan assets at December 31, 2018 and December 31, 2017, fair value asset categories and the level of inputs as defined in Note 4 are as follows:



Dollar amounts in millions Asset Category	December 31, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Equity investment funds:^(a)
Domestic stock funds:
Measured within the fair value hierarchy	$	22.3	$	22.3	$	—	$	—
Measured at net asset value ^(d)	8.3		—		8.3		—
International stock funds:
Measured within the fair value hierarchy	13.2		13.2		—		—
Measured at net asset value ^(d)	13.7				13.7
Fixed income investment funds:^(b)
Domestic bond funds:
Measured within the fair value hierarchy	27.1		27.1		—		—
Measured at net asset value ^(d)	88.5		3.9		84.6
International bond funds:
Measured within the fair value hierarchy	27.3				27.3
Measured at net asset value ^(d)	20.1		—		20.1		—
Multi-strategy funds:^(c)
Measured within the fair value hierarchy	35.0		35.0		—		—
Measured at net asset value ^(d)	17.8		—		5.1		12.7
Cash & cash equivalents	1.5		—		1.5		—
Total	$	274.8	$	101.5	$	160.6	$	12.7

_______________


^(a)	Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.


^(b)	Fixed income investments include investments in funds that are primarily invested in a diversified portfolio of investment grade U.S. and international debt securities.


^(c)	The multi-strategy funds invest in various hedge funds that employ a fund of funds strategy.


^(d)	Investments for which fair value is measured using the net asset value per share as a practical expedient are not categorized within the fair value hierarchy.



Dollar amounts in millions Asset Category	December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Equity investment funds:^(a)
Domestic stock funds	$	56.2	$	42.2	$	14.0	$	—
International stock funds	43.1		15.5		27.6		—
Fixed income investment funds:^(b)
Domestic bond funds	40.2		20.2		20.0		—
International bond funds	40.9		—		40.9		—
Multi-strategy funds^(c)	82.5		69.6		—		12.9
Cash & cash equivalents	3.0		—		3.0		—
Total	$	265.9	$	147.5	$	105.5	$	12.9

_______________


^(a)	Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.


^(b)	Fixed income investments include investments in funds that are primarily invested in a diversified portfolio of investment grade U.S. and international debt securities.


^(c)	The multi-strategy funds invest in various hedge funds that employ a fund of funds strategy.

Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]

he following table summarizes assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the period.



Dollar amounts in millions	Multi-Strategy Funds
Balance at January 1, 2017	$	12.2
Total unrealized gains	0.7
Contribution (redemption)	0.1
Management fees	(0.1		)
Balance at December 31, 2017	$	12.9
Total unrealized gains	$	(0.2	)
Contribution (redemption)	0.2
Management fees	(0.2		)
Balance at December 31, 2018	$	12.7

Accumulated Comprehensive Loss (Tables)

12 Months Ended

Dec. 31, 2018

Accumulated Other Comprehensive Income (Loss) [Line Items]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

Other comprehensive income activity, net of tax, is provided in the following table for the years ended December 31, 2018, 2017 and 2016.



				Pension adjustments
Dollar amounts in millions	Foreign currency translation adjustments			Actuarial losses			Prior service costs			Unrealized gain (loss) on investments			Other			Total
Balance at January 1, 2016	$	(55.1	)	$	(87.8	)	$	(5.5	)	$	3.3		$	(1.0	)	$	(146.1	)
Other comprehensive income (loss) before reclassifications	8.8			(5.3		)	—			(1.0		)	0.4			2.9
Income taxes	—			1.9			—			0.4			(0.1		)	2.2
Net other comprehensive income (loss) before reclassifications	8.8			(3.4		)	—			(0.6		)	0.3			5.1
Amounts reclassified from accumulated comprehensive income (loss)	—			5.5			0.5			—			—			6.0
Income taxes	—			(2.0		)	(0.2		)	—			—			(2.2		)
Net amounts reclassified from cumulative other comprehensive income (loss)	—			3.5			0.3			—			—			3.8
Total other comprehensive income (loss)	8.8			0.1			0.3			(0.6		)	0.3			8.9
Balance at December 31, 2016	(46.3		)	(87.7		)	(5.2		)	2.7			(0.7		)	(137.2		)
Other comprehensive income (loss) before reclassifications	6.6			3.2			—			1.3			(0.9		)	10.2
Income taxes	—			(1.1		)	—			(0.5		)	0.2			(1.4		)
Net other comprehensive income (loss) before reclassifications	6.6			2.1			—			0.8			(0.7		)	8.8
Amounts reclassified from accumulated comprehensive income (loss)	—			9.3			0.5			—			(0.1		)	9.7
Income taxes	—			(3.2		)	(0.2		)	—			—			(3.4		)
Net amounts reclassified from cumulative other comprehensive income (loss)	—			6.1			0.3			—			(0.1		)	6.3
Total other comprehensive income (loss)	6.6			8.2			0.3			0.8			(0.8		)	15.1
Balance at December 31, 2017	(39.7		)	(79.5		)	(4.9		)	3.5			(1.5		)	(122.1		)
Effect of adoption of ASU 2018-02	—			(17.4		)	—			0.7			—			(16.7		)
Other comprehensive income (loss) before reclassifications	(17.3		)	4.1			—			0.1			0.7			(12.4		)
Income taxes	—			(1.1		)	—			—			(0.2		)	(1.3		)
Net other comprehensive income (loss) before reclassifications	(17.3		)	3.0			—			0.1			0.5			(13.7		)
Amounts reclassified from accumulated comprehensive income (loss)	—			7.6			0.5			—			—			8.1
Income taxes	—			(1.9		)	(0.1		)	—			—			(2.0		)
Net amounts reclassified from cumulative other comprehensive income (loss)	—			5.7			0.4			—			—			6.1
Total other comprehensive income (loss)	(17.3		)	8.7			0.4			0.1			0.5			(7.6		)
Balance at December 31, 2018	$	(57.0	)	$	(88.2	)	$	(4.5	)	$	4.3		$	(1.0	)	$	(146.4	)

Segment Information (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

Information about our product segments is as follows:



	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
SALES BY BUSINESS SEGMENT
Siding	$	942.3		$	884.0		$	752.3
OSB	1,305.2			1,302.5			1,027.7
Engineered Wood Products	390.9			365.9			296.9
South America	160.8			155.3			136.9
Other products	28.9			30.0			26.9
Intersegment Sales	(0.1		)	(3.8		)	(7.3		)
Total sales	$	2,828.0		$	2,733.9		$	2,233.4
PROFIT (LOSS) BY BUSINESS SEGMENT
Siding	$	201.6		$	188.7		$	128.0
OSB	395.7			427.3			187.8
Engineered Wood Products	19.5			15.7			(4.6		)
South America	31.0			24.3			17.0
Other products	(4.3		)	(3.4		)	(1.5		)
Other operating credits and charges, net	2.2			(4.9		)	(17.4		)
Gain (loss) on sales of and impairments of long-lived assets	(10.8		)	(6.8		)	8.4
General corporate and other expense, net	(111.7		)	(108.1		)	(102.3		)
Interest expense, net of capitalized interest	(15.8		)	(19.3		)	(32.1		)
Investment income	17.6			10.5			8.2
Other non-operating income (expense)	(3.9		)	(13.8		)	(21.4		)
Income from continuing operations before taxes	521.1			510.2			170.1
Provision for income taxes	122.3			119.1			19.8
Income from continuing operations	$	398.8		$	391.1		$	150.3

	Year ended December 31,
	2018			2017			2016
DEPRECIATION AND AMORTIZATION
Siding	$	32.3		$	30.9		$	27.4
OSB	58.3			61.6			58.6
Engineered Wood Products	15.1			15.8			12.7
South America	9.1			9.1			8.6
Other products	2.0			2.8			2.3
Non-segment related	3.2			3.1			3.2
Total depreciation and amortization	$	120.0		$	123.3		$	112.8

CAPITAL EXPENDITURES
Siding	$	117.1		$	63.0		$	49.9
OSB	54.9			58.4			49.3
Engineered Wood Products	9.9			6.0			5.3



South America	28.3		17.5		8.7
Other products	1.2		1.0		8.1
Non-segment related	2.8		2.7		3.5
Total capital expenditures	$	214.2	$	148.6	$	124.8

Information concerning identifiable assets by segment is as follows:



Dollar amounts in millions	December 31,
Dollar amounts in millions	2018		2016
IDENTIFIABLE ASSETS
Siding	$	487.1	$	371.8
OSB	578.6		577.5
Engineered Wood Products	122.9		116.3
South America	113.6		95.9
Other products	63.6		93.7
Non-segment related	1,148.3		1,193.3
Total assets	$	2,514.1	$	2,448.5

Schedule of Segment Reporting Information, by Geographical Areas [Table Text Block]

Information concerning our geographic segments is as follows:



	Year ended December 31,
Dollar amounts in millions	2018			2017			2016
GEOGRAPHIC LOCATIONS
Total Sales—Point of origin
U.S.	$	2,409		$	2,307		$	1,882
Canada	861			704			682
South America	174			165			137
Intercompany sales	(616		)	(442		)	(468		)
Total Sales	$	2,828		$	2,734		$	2,233
Operating profit (loss)
U.S.	$	475		$	462		$	239
Canada	138			167			71
South America	31			24			17
Other operating credits and charges, net and gain (loss) on sales of and impairments of long-lived assets	(9		)	(12		)	(9		)
General corporate expense, loss on early debt extinguishment, other income(expense) and interest, net	(114		)	(131		)	(148		)
	521			510			170
Provision for income taxes	122			119			20
Income from continuing operations	$	399		$	391		$	150

IDENTIFIABLE TANGIBLE LONG LIVED ASSETS
U.S.	$	540		$	529		$	516
Canada	449			380			365
South America	84			73			57
Total assets	$	1,073		$	982		$	938

Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Entity Information [Line Items]
Advertising Expense	$ 21.3	$ 19.1	$ 19.6

Summary of Significant Accounting Policies Inventory (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Inventory [Line Items]
Logs	$ 56.9	$ 60.3
Other raw materials	24.8	20.8
Semi finished inventory	23.4	24.3
Finished products	167.9	153.7
Total	$ 273.0	$ 259.1

Summary of Significant Accounting Policies Depreciation and Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Depreciation and amortization included in Cost of sales	$ 116.8	$ 120.1	$ 109.6
Depreciation and amortization included in Selling and administrative	3.2	3.2	3.2
Total depreciation and amortization	$ 120.0	$ 123.3	$ 112.8

Summary of Significant Accounting Policies Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Capitalized Interest	$ 4.0	$ 2.2	$ 1.9
Land, land improvements and logging roads, net of road amortization	168.6	162.7
Buildings	329.9	347.5
Machinery and equipment	1,949.0	1,977.4
Construction in progress	148.1	98.5
Property, Plant and Equipment, Gross	2,595.6	2,586.1
Accumulated depreciation	1,585.2	1,660.0
Property, Plant and Equipment, Net	$ 1,010.4	$ 926.1

Present and Prospective Accounting Pronouncements Cumulative effect of adoption of 2014-09 and 2018-02 (Details) - USD ($) $ in Millions	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables, net of allowance for doubtful accounts	$ 127.6		$ 142.5
Inventories	273.0		259.1
Deferred tax asset			2.5
Retained earnings	1,612.6		1,280.1
Accumulated comprehensive loss	$ (146.4)		$ (122.1)	$ (137.2)	$ (146.1)
Balance upon adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables, net of allowance for doubtful accounts		$ 120.8
Inventories		274.9
Deferred tax asset		4.0
Retained earnings		1,292.4
Accumulated comprehensive loss		(138.8)
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables, net of allowance for doubtful accounts		(21.7)
Inventories		15.8
Deferred tax asset		1.5
Retained earnings		(4.4)
Accumulated comprehensive loss		0.0
Accounting Standards Update 2018-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables, net of allowance for doubtful accounts		0.0
Inventories		0.0
Deferred tax asset		0.0
Retained earnings		16.7
Accumulated comprehensive loss		$ (16.7)

Present and Prospective Accounting Pronouncements Effect of change related to 2014-09 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	$ 2,828.0	$ 2,733.9	$ 2,233.4
Cost of sales	2,084.0	1,998.1	1,829.1
Selling, general and administrative expense	(209.3)	(191.3)	(185.1)
Provision for income taxes	122.3	119.1	19.8
Net income	394.6	389.8	$ 149.8
Receivables, net of allowance for doubtful accounts	127.6	142.5
Inventories	273.0	259.1
Income taxes payable	21.0	4.5
Retained earnings	1,612.6	$ 1,280.1
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	2,829.6
Cost of sales	2,082.0
Selling, general and administrative expense	(213.8)
Provision for income taxes	122.1
Net income	393.9
Receivables, net of allowance for doubtful accounts	146.6
Inventories	259.2
Income taxes payable	22.3
Retained earnings	1,616.3
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	1.6
Cost of sales	2.0
Selling, general and administrative expense	(4.5)
Provision for income taxes	0.2
Net income	0.7
Receivables, net of allowance for doubtful accounts	19.0
Inventories	13.8
Income taxes payable	1.3
Retained earnings	$ (3.7)

Present and Prospective Accounting Pronouncements Effect of change related to 2017-07 and other reclassifications (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales	$ 2,084.0	$ 1,998.1	$ 1,829.1
Selling, general and administrative expense	(209.3)	(191.3)	(185.1)
Other operating credits and charges, net	(2.2)	4.9	17.4
Income from operations	526.1	532.8	210.2
Total non-operating income (expense)	$ (2.1)	(22.6)	(45.3)
Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales (exclusive of depreciation and amortization shown separately below)		1,882.0	1,724.0
Depreciation and amortization		123.3	112.8
Selling, general and administrative expense		(190.4)	(183.6)
Other operating credits and charges, net		(8.0)
Income from operations		523.4	204.0
Total non-operating income (expense)		(13.2)	(39.1)
Reclassifications other than adoptions [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Depreciation and amortization		0.0	0.0
Reclassifications other than adoptions [Member] \| Scenario, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales		120.1	109.6
Depreciation and amortization		(123.3)	(112.8)
Selling, general and administrative expense		(3.2)	(3.2)
Other operating credits and charges, net		0.0
Income from operations		0.0	0.0
Total non-operating income (expense)		0.0	0.0
Accounting Standards Update 2017-07 [Member] \| Scenario, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales		(4.0)	(4.5)
Depreciation and amortization		0.0
Selling, general and administrative expense		2.3	1.7
Other operating credits and charges, net		3.1
Income from operations		9.4	6.2
Total non-operating income (expense)		$ (9.4)	$ (6.2)

Present and Prospective Accounting Pronouncements Effect of change related to 2016-18 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Cash Provided by (Used in) Investing Activities	$ (238.2)	$ (198.6)	$ 285.1
Effect of exchange rate on cash, cash equivalents and restricted cash	(4.8)	3.1	3.1
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(49.5)	268.8	223.5
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 891.8	941.3	672.5	$ 449.0
Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Cash Provided by (Used in) Investing Activities		(198.6)	286.3
Effect of exchange rate on cash, cash equivalents and restricted cash		3.0	3.0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect		268.7	224.6
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		928.0	659.3	434.7
Accounting Standards Update 2016-18 [Member] \| Scenario, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Cash Provided by (Used in) Investing Activities		0.0	(1.2)
Effect of exchange rate on cash, cash equivalents and restricted cash		0.1	0.1
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect		0.1	(1.1)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		$ 13.3	$ 13.2	$ 14.3

Revenue (Details) - USD ($) $ in Millions	12 Months Ended
Revenue (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Consignment inventory	$ 9.5			$ 18.3
Accrued rebates	$ 30.1			$ 24.2
All Customers [Member] [Member]
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	44.00%	46.00%	41.00%

Investments (Details) - USD ($) $ in Millions	12 Months Ended
Investments (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Return of principal on ARS	$ 0.4
Gain included in investment income	(0.4)	$ 0.0	$ 0.0
Auction Rate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0.4	0.4
Gross Unrealized Gains	5.7	5.6
Gross Unrealized Losses	0.0
Fair Value	6.1	$ 6.0
Par Value Available For Sale Securities	$ 19.3

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References + Details

Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 6.1	$ 6.0	$ 4.8
Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
Available for sale securities	6.1	6.0
Trading securities	3.1	3.1
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Available for sale securities	0.0	0.0
Trading securities	3.1	3.1
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Assets, Fair Value Disclosure [Abstract]
Available for sale securities	0.0	0.0
Trading securities	0.0	0.0
Fair Value, Measurements, Recurring \| Significant Unobservable Inputs (Level 3)
Assets, Fair Value Disclosure [Abstract]
Available for sale securities	6.1	6.0
Trading securities	$ 0.0	$ 0.0

Fair Value Measurements Unobservable Inputs Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 6.0	$ 4.8
Return of principal on ARS	0.4
Gain included in investment income	0.4	0.0	$ 0.0
Gain (loss) included in other comprehensive income	0.1	1.2
Ending balance	$ 6.1	$ 6.0	$ 4.8

Earnings Per Share (Details) - shares shares in Millions	12 Months Ended
Earnings Per Share (Details) - shares shares in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Weighted average number of shares outstanding - basic	143.0	144.4	143.4
Dilutive effect of employee stock plans	1.4	2.0	1.7
Dilutive effect of stock warrants	0.0	0.0	0.2
Dilutive potential common shares	1.4	2	1.9
Adjusted weighted average shares	144.4	146.4	145.3
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.0	0.2	2.6

Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Trade receivables	$ 86.7	$ 124.6
Income Taxes Receivable	16.3	2.2
Other receivables	25.4	16.6
Allowance for doubtful accounts	(0.8)	(0.9)
Total	127.6	142.5
Current portion of notes receivable from asset sales	$ 0.0	$ 22.2

Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 16.1	$ 16.1	$ 9.7
Goodwill, Additions during period	0.0	6.4
Acquired Intangible Assets, including Goodwill	0.0	17.4
Amortization of Intangible Assets	(3.7)	(3.6)
Intangible Assets, Net (Including Goodwill)	66.9	70.6	56.8
Payments to Acquire Businesses, Gross	22.0
Future Amortization Expense, Year One	3.8
Future Amortization Expense, Year Two	3.8
Future Amortization Expense, Year Three	3.8
Future Amortization Expense, Year Four	3.8
Future Amortization Expense, Year Five	3.8
Timber licenses
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	40.7	43.9	47.1
Amortization of Intangible Assets	(3.2)	(3.2)
Timber Licenses, Initial Value	91.3
Technology-Based Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	10.1	10.6	$ 0.0
Finite-lived Intangible Assets Additions during period	0.0	11.0
Amortization of Intangible Assets	$ 0.5	$ 0.4

Investments in and Advances to Affiliates (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Payments to Acquire Interest in Joint Venture	$ 45.0
Noncontrolling Interest, Ownership Percentage by Parent	50.00%
Revenue from affiliates	$ 16.9	$ 15.5	$ 11.7
Expenses from affiliates	57.7	60.1	53.1
Due from affiliates	3.8	3.6
Due to affiliates	0.1	1.2
Cash Dividends Paid to Parent Company by Unconsolidated Subsidiaries	2.6	3.3
Income from affiliates, classified in cost of sales	(2.2)	4.0
Equity in (income) loss of unconsolidated affiliates	$ 2.9	$ 0.0	$ (5.2)
Entekra, A units [Member]
Related Party Transaction [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	80.00%
Entekra, B units [Member] [Member]
Related Party Transaction [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	60.00%

Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts Payable and Accrued Liabilities [Abstract]
Accounts payable	$ 116.1	$ 112.3
Salaries and wages payable	64.1	75.8
Taxes other than income taxes	3.5	3.0
Current portion of warranty reserves	3.0	9.0	$ 9.0
Accrued interest	6.8	6.0
Accrued rebates	30.1	24.2
Other accrued liabilities	9.7	6.8
Total Accounts payable and accrued liabilities	233.3	237.1
Capital Expenditures Incurred but Not yet Paid	$ 22.1	$ 19.0

Income Taxes Tax act (Details) - USD ($) $ in Millions	12 Months Ended
Income Taxes Tax act (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%	35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ 3.1	$ 18.4
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	$ 0.0

Income Taxes Income Statement table (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	(1.00%)	(3.00%)	0.00%
Domestic	$ 359.1	$ 341.8	$ 98.4
Foreign	162.0	168.4	71.7
Income (loss) from continuing operations before income taxes, extraordinary items, noncontrolling interest	$ 521.1	$ 510.2	$ 170.1

Income Taxes Income tax provision (benefit) from continuing operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S. federal	$ 55.5	$ 105.8	$ 60.4
State and local	8.4	4.4	4.4
Foreign	31.7	7.9	10.4
Net current tax provision (benefit)	95.6	118.1	75.2
U.S federal	11.2	(19.3)	(48.1)
State and local	5.8	8.0	1.2
Foreign	11.1	38.2	11.7
Net valuation allowance increase (decrease)	(1.4)	(25.9)	(20.2)
Deferred income tax expense (benefit)	26.7	1.0	(55.4)
Provision (benefit) for income taxes	122.3	119.1	19.8
Income Tax Refunds	0.2	0.3	0.8
Income Taxes Paid	89.9	143.1	$ 8.7
Income Taxes Receivable	16.3	2.2
Income taxes payable	$ 21.0	$ 4.5

Income Taxes Reconciliation of deferred taxes (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Valuation Allowance [Line Items]
Accrued liabilities	$ 21.4	$ 26.6
Pension and post-retirement benefits	8.3	19.9
Share-based compensation	5.3	6.9
Benefit of capital loss and NOL carryovers	15.8	38.9
Other	13.1	10.2
Inventory	7.7	6.6
Market value write down of ARS	3.3	4.9
Benefit of tax credit carryovers	0.4	3.5
Valuation Allowance, Amount	(12.0)	(13.6)
Deferred Tax Assets, Net	63.3	103.9
Property, plant and equipment	(111.8)	(118.2)
Timber and timberlands	9.8	11.4
Installment sale gain deferral	0.0	5.2
Total Deferred Tax Liabilities	(121.6)	(134.8)
Deferred Tax Liabilities, Net	(58.3)	(30.9)
Long-term deferred tax asset	(3.9)	(2.5)
Long-term deferred tax liability	$ (62.2)	$ (33.4)

Income Taxes NOL and credit carryovers (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	$ 15.8	$ 38.9
Federal NOL carryover valuation allowance	(6.5)
Valuation Allowance, Amount	(12.0)	$ (13.6)
Federal NOL carryover	16.2
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Domestic Subsidiaries	22.0
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	9.9
Operating Loss Carryforwards, Valuation Allowance	(0.5)
Canada Revenue Agency [Member]
Operating Loss Carryforwards [Line Items]
Federal NOL carryover valuation allowance	0.0
Deferred Tax Assets, Tax Credit Carryforwards	0.1
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Federal NOL carryover valuation allowance	(0.1)
Deferred Tax Assets, Tax Credit Carryforwards	0.3
Capital Loss Carryforward [Member] \| Canada Revenue Agency [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Capital Loss Carryforwards	5.7
Valuation Allowance, Amount	(5.7)
Secretariat of the Federal Revenue Bureau of Brazil [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	0.2
Operating Loss Carryforwards, Valuation Allowance	$ (0.2)

Income Taxes (Details)	12 Months Ended
Income Taxes (Details)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal tax rate	21.00%	35.00%	35.00%
State and local income taxes	3.00%	2.00%	2.00%
Tax credits	1.00%	1.00%	12.00%
Capital gain - timber	0.00%	0.00%	(15.00%)
Stock-based compensation	(1.00%)	(0.00%)	(2.00%)
Domestic manufacturing deduction	(0.00%)	(2.00%)	(2.00%)
Valuation allowance	0.00%	(6.00%)	(12.00%)
Uncertain tax positions	0.00%	1.00%	21.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	(1.00%)	(3.00%)	0.00%
Other, net	1.00%	(1.00%)	0.00%
Effective tax rate (%)	23.00%	23.00%	12.00%
Foreign tax rate
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effect of foreign tax rates / foreign exhchange	2.00%	(3.00%)	(5.00%)
Foreign Currency Gain (Loss)
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effect of foreign tax rates / foreign exhchange	(1.00%)	1.00%	2.00%

Income Taxes Uncertain tax positions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits	$ 40.8	$ 40.3	$ 39.8	$ 4.1
Tax positions taken in current year	0.7	0.6	26.9
Tax positions taken in prior years	0.7	1.2	10.4
Tax positions taken in current year	0.0	0.0	0.0
Tax positions taken in prior years	0.0	(1.3)	0.0
Settlements during the year	(0.9)	0.0	0.0
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	0.0	0.0	$ (1.6)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	40.2	39.9
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	0.3	0.7
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 3.4	$ 3.7

Non-operating Income (Expense) Disclosure (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Nonoperating Income (Expense) [Abstract]
Interest Expense	$ (19.0)	$ (20.6)	$ (32.9)
Amortization of financing costs and discounts	(0.8)	(0.9)	(1.1)
Capitalized Interest	4.0	2.2	1.9
Interest expense, net of capitalized interest	(15.8)	(19.3)	(32.1)
Investment Income	18.1	9.5	8.0
Gain on securities	(0.4)	0.0	0.0
SERP market adjustments	(0.9)	1.0	0.2
Investment income	17.6	10.5	8.2
Defined Benefit Plan, Other Components of Net Periodic Pension Cost	(4.3)	(9.4)	(6.2)
Foreign currency losses	0.4	(4.4)	2.1
Loss on early debt extinguishment	0.0	0.0	(17.3)
Other Nonoperating Income (Expense)	(3.9)	(13.8)	(21.4)
Total non-operating income (expense)	$ (2.1)	$ (22.6)	$ (45.3)

Long-term Debt (Details) $ in Millions	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CLP ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	May 01, 2012
Notes and Loans Payable [Abstract]
Long-term Debt, Gross	$ 355.7		$ 380.4
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(3.8)		(4.5)
Long-term debt	351.9		375.9
Current portion of long-term debt	(5.0)		(25.1)
Long term debt, Gross, Noncurrent	350.7		355.3
Long-term debt, excluding current portion	346.9		350.8
Senior unsecured notes, maturing 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 350.0
Notes and Loans Payable [Abstract]
Debt, interest rate, stated percentage	4.90%	4.90%			4.875%
Long-term Debt, Gross	$ 350.0		350.0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(3.7)		(4.4)
Long-term debt	346.3		345.6
Chilean term credit facility, maturing 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 39.0	$ 943,543.7391
Notes and Loans Payable [Abstract]
Debt, interest rate, stated percentage	3.90%	3.90%
Long-term Debt, Gross	$ 4.7		7.7
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(0.1)		(0.1)
Long-term debt	4.6		7.6
Senior notes payable 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 348.6
Notes and Loans Payable [Abstract]
Debt, interest rate, stated percentage	7.30%	7.30%
Long-term Debt, Gross	$ 0.0		22.0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	0.0		0.0
Long-term debt	0.0		22.0
Other Debt Obligations [Member]
Notes and Loans Payable [Abstract]
Long-term Debt, Gross	1.0		0.7
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net			0.0	$ 0.0
Long-term debt	$ 1.0		$ 0.7

Long-term Debt Narrative (Details)	12 Months Ended
Long-term Debt Narrative (Details)	Dec. 31, 2018 USD ($) payments	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 CLP ($)	May 01, 2012
Debt Instrument [Line Items]
Amortization of financing costs and discounts	$ 800,000	$ 900,000	$ 1,100,000
Long-term Debt, Gross	355,700,000	380,400,000
Impact of foreign currency exchange rates	1,100,000	(2,100,000)	2,000,000
Line of Credit Facility, Remaining Borrowing Capacity	200,000,000
Line of Credit Capacity, Sublimit for Letters of Credit	$ 60,000,000
Capitalization Ratio, Maximum	40.00%			40.00%
Required debt to equity ratio maximum	1
Required EBITDA to financial costs minimum	3
Loss on early debt extinguishment	$ 0	$ 0	(17,300,000)
Debt, weighted average interest rate	4.90%	5.10%		4.90%
Interest paid, net	$ 19,800,000	$ 17,500,000	$ 27,200,000
Senior notes payable 2018 [Member]
Debt Instrument [Line Items]
Fair value of debt		22,400,000
Amount of loan issuance	348,600,000
Long-term Debt, Gross	0	22,000,000
Notes Receivable	$ 22,200,000
Debt, interest rate, stated percentage	7.30%			7.30%
Chilean term credit facility, maturing 2019 [Member]
Debt Instrument [Line Items]
Amount of loan issuance	$ 39,000,000			$ 943,543.7391
Long-term Debt, Gross	4,700,000	7,700,000
Repayments of Debt	2,300,000
Impact of foreign currency exchange rates	900,000.0
Impact of UF change	$ 200,000
Debt, interest rate, stated percentage	3.90%			3.90%
Ratio of indebtedness to net capital	2.5			2.5
Number of future semi-annual payments \| payments	16
Senior unsecured notes, maturing 2024 [Member]
Debt Instrument [Line Items]
Fair value of debt	$ 337,900,000	364,000,000
Amount of loan issuance	350,000,000
Long-term Debt, Gross	$ 350,000,000	$ 350,000,000
Debt, interest rate, stated percentage	4.90%			4.90%	4.875%
Base Rate
Debt Instrument [Line Items]
Line of credit facility, interest rate description	.005
Base Rate \| Maximum
Debt Instrument [Line Items]
Line of credit facility, interest rate description	.0175
Base Rate \| Minimum
Debt Instrument [Line Items]
Line of credit facility, interest rate description	.00625
London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Line of credit facility, interest rate description	.01
London Interbank Offered Rate (LIBOR) \| Maximum
Debt Instrument [Line Items]
Line of credit facility, interest rate description	.0275
London Interbank Offered Rate (LIBOR) \| Minimum
Debt Instrument [Line Items]
Line of credit facility, interest rate description	0.01625
Other Commitments [Domain] \| Maximum
Debt Instrument [Line Items]
Line of credit facility, interest rate description	.005
Other Commitments [Domain] \| Minimum
Debt Instrument [Line Items]
Line of credit facility, interest rate description	.0020

Long-term Debt Long-term Debt Required repayment of Principal (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
2019	$ 5.2
2020	0.2
2021	0.2
2022	0.1
2023	0.0
2024 and after	350.0
Long-term debt	$ 355.7	$ 380.4

Stockholders' Equity Preferred stock (Details) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	15,000,000	15,000,000
Preferred Stock, Par or Stated Value Per Share	$ 1.00	$ 1.00

Common Stock Plan (Details) - USD ($) shares in Millions	12 Months Ended
Common Stock Plan (Details) - USD ($) shares in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Compensation expense related to all stock-based compensation plans	$ 8,600,000	$ 9,700,000	$ 13,000,000
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	3,100,000.0	800,000.0	3,400,000.0
Payments Related to Tax Withholding for Share-based Compensation	$ (9,300,000)	$ (5,900,000)	$ (9,200,000)
Options and SSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	3.0

SSARs (Details) - Options and SSARs [Member] - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected stock price volatility	41.00%	45.00%
Expected dividend yield	0.00%	0.00%
Risk-free interest rate	2.10%	1.40%
Expected life of options	6 years	6 years
Weighted average fair value of options and SSARs granted	$ 8.02	$ 6.99

Summary of Stock Awards Oustanding (Details) - USD ($)
$ / shares in Units, $ in Millions

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value

$ 35.2

$ 26.5

$ 29.8

Share Based Compensation Arrangement by Share Based Payment Award, Options And Ssars, Outstanding, Intrinsic Value

7.7

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value

$ 7.8

$ 6.7

$ 3.8

Options and Ssars [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number

1,141,686

2,404,808

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price

$ 15.50

$ 14.76

Options / SSARs granted

Options / SSARs exercised

(1,201,644)

Options / SSARs cancelled

Options/ SSARs forfeited

(61,478)

Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price

$ 15.50

Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Weighted Average Grant Date Fair Value

$ 17.51

Options / SSARs exercisable

870,431,000

Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number

^[1]

1,084,602

SSARs granted Weighted Average Exercise Price

$ 0.00

Options / SSARs cancelled Weighted Average Exercise Price

0.00

Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price

$ 14.83

Weighted-average period of years costs are expected to be recognied over

9 months 3 days

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value

$ 13.91

Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options

$ 0.5

Restricted Stock [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Awards Other than Options, Vested and Expected to Vest, Outstanding, Number

228,165

Share-based Compensation Arrangement by Share-based Payment Award, Equity Awards Other than Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price

$ 17.43

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number

240,174

311,215

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value

$ 17.43

$ 17.33

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value

$ 0.00

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period

(64,747)

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value

$ 17.04

Unrecognized compensation costs

$ 0.7

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period

(6,294)

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value

$ 16.80

Restricted Stock Units (RSUs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Awards Other than Options, Vested and Expected to Vest, Outstanding, Number

908,783

Share-based Compensation Arrangement by Share-based Payment Award, Equity Awards Other than Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price

$ 23.17

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number

956,614

851,244

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value

$ 23.17

$ 18.93

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period

491,114

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value

$ 27.74

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period

(217,000)

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value

$ 17.95

Unrecognized compensation costs

$ 9.7

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period

(168,744)

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value

$ 21.59

Restricted Stock Units (RSUs) [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Weighted-average period of years costs are expected to be recognied over

1 year 3 months 25 days

Restricted Stock [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Weighted-average period of years costs are expected to be recognied over

7 months 15 days

[1]	xpected to vest based upon historical forfeiture rate

Asset Retirement Obligation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
ASSET RETIREMENT OBLIGATIONS [Abstract]
Beginning balance	$ 10.8	$ 10.2
Accretion Expense	0.9	0.8
Accrued to expense during the year	1.6	0.0
Adjusted to other operating credits and charges	(0.8)	0.0
Payments made	(0.4)	(0.3)
Translation	(0.1)	0.1
Ending balance	$ 12.0	$ 10.8

Other Operating Credits and Charges, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Gain Contingencies [Line Items]
Reorganization charges	$ (10.3)	$ 0.0	$ 0.0
Refund of sales and use taxes	0.5	0.8	0.0
Refund on environmental costs	8.3	0.0	0.0
Loss on workers compensation reserves	0.0	0.9	0.0
Adjustment to product related warranty reserves	7.7	(5.4)	(16.9)
Expenses related to a hurricane	(4.5)	0.0	0.0
Other Income	0.5	0.6
Other Expenses			(0.5)
Other operating credits and charges, net	$ 2.2	$ (4.9)	$ (17.4)

Other Operating Credits and Charges, Net Other Operating Charges, Severance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Beginning balance at December 31,	$ 1.7	$ 0.2	$ 0.2
Severance costs accrued to expense during year	0.3	3.7	0.5
Accrued to other operating charges and credits	10.3	0.0	0.0
Payments	(6.8)	(2.2)	(0.5)
Ending balance	$ 5.5	$ 1.7	$ 0.2

Gain (loss) on sales or impairment of long lived assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment charges on long-lived assets	$ (10.7)	$ (9.1)	$ (0.8)
Loss on facility previously held for sale	4.7
Loss on impairment of manufacturing equipment	$ 3.0	0.8
Other Asset Impairment Charges	(0.1)	(10.6)
Loss on Disposal		(1.4)
Loss on sale of manufacturing facilities		2.3	9.2
Gain (loss) on sale of or impairment of long-lived assets	$ (10.8)	$ (6.8)	$ 8.4

Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
Contingencies (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loss Contingencies [Line Items]
Loss contingency accrual	$ 10.8	$ 15.1
Current portion of contingency reserves	(2.3)	(3.4)
Long-term portion of contingency reserves	8.5	11.7
Reserve for Environmental Costs [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Period Increase (Decrease)	2.1	(1.2)	$ (0.7)
Loss contingency accrual	10.6	15.0	$ 15.9	$ 16.6
Hardboard Siding Reserves
Loss Contingencies [Line Items]
Loss contingency accrual	$ 0.2	$ 0.1

Contingencies Enviromental liabilities rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Beginning Balance	$ 15.1
Ending Balance	10.8	$ 15.1
Receivable for environmental costs, recorded in Other assets	1.4
Reserve for Environmental Costs [Member]
Beginning Balance	15.0	15.9	$ 16.6
Adjusted to expense (income) during the year	(2.1)	1.2	0.7
Payments made	2.2	2.1	1.4
Translation	0.1	0.0	0.0
Ending Balance	10.6	$ 15.0	$ 15.9
Formal cost share [Member]
Other Unrecorded Amounts	1.9
Indemnification Agreement [Member]
Other Unrecorded Amounts	2.1
Other Reserves [Member]
Other Unrecorded Amounts	$ 0.3

Committments and Contingent Liabilities (Details) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2017 CAD ($)	Dec. 31, 2002 CAD ($)
Commitments and Contingencies Disclosure [Abstract]
Indemnity				$ 5.0	$ 15.0
2019	$ 8.4
2020	7.3
2021	4.6
2022	1.8
2023	0.0
After 2024	0.0
Total	22.1
Operating Leases, Rent Expense	$ 15.1	$ 12.5	$ 11.0

Product Warranty (Details) - USD ($) $ in Millions	12 Months Ended
Product Warranty (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Beginning Balance	$ 24.7	$ 24.1	$ 21.0
Accrued to expense during the year	1.0	1.0	0.8
Accrued/(credited) to other operating credits and charges	(7.7)	5.4	(16.9)
Accrued to discontinued operations	(5.0)	(1.5)	(0.5)
Foreign Currency Translation	(0.7)	2.2	(0.2)
Payments made	(8.8)	(9.5)	(14.9)
Ending Balance	$ 24.7	$ 24.1	21.0	$ 13.5	$ 24.7	$ 24.1
Current portion of warranty reserves				(3.0)	(9.0)	(9.0)
Long-term portion of warranty reserves				$ 10.5	$ 15.7	$ 15.1
Damages from Product Defects [Member]
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Accrued to discontinued operations			$ (0.5)

Discontinued Operations (Details) - USD ($) $ in Millions	12 Months Ended
Discontinued Operations (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations before taxes	$ (5.6)	$ (2.0)	$ (0.8)
Cash Provided by (Used in) Operating Activities, Discontinued Operations	(6.7)	(1.8)	(2.6)
Product Warranty Accrual, Discontinued Operations	5.0	1.5	0.5
Damages from Product Defects [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash Provided by (Used in) Operating Activities, Discontinued Operations	$ 6.1	$ 1.3	2.3
Product Warranty Accrual, Discontinued Operations			$ 0.5

- Definition

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

+ References + Details

Retirement Plans and Post Retirement Benefits Defined Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2016
Retirement Benefits [Abstract]
Maximum benefit amortization period	20 years
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	$ 3.1	$ 0.1
Approximate percentage of assets represented by most significant plans	81.00%
Approximate percentage of benefit obligations represented by most significant plans	83.00%
Rate of eligible compensation increase	4.00%

Retirement Plans and Post Retirement Benefits Funded Status, Assumptions Used in Benefit Obligations and Amounts Recognized in Balance Sheets (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

Change in Benefit Obligation [Roll Forward]

Beginning of year balance

$ 345.5

$ 331.9

Service cost

2.6

4.9

$ 4.3

Interest cost

11.1

12.5

13.1

Actuarial (gain)/loss

(24.5)

10.8

Curtailment

(1.3)

0.0

Foreign exchange rate changes

(4.5)

3.6

Benefits Paid

32.2

18.2

End of year balance

296.7

345.5

331.9

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

265.9

239.9

Actual return on plan assets

(7.3)

27.8

Employer contribution

52.9

12.7

Foreign exchange rate changes

(4.5)

3.7

Fair value of plan assets, end of year balance

274.8

265.9

239.9

Funded status

(21.9)

(79.6)

Amounts Recognized in Balance Sheet [Abstract]

Noncurrent pension assets, included in “Other assets”

4.5

1.4

Current pension liabilities, included in “Accounts payable and accrued liabilities”

(3.1)

(12.1)

Noncurrent pension liabilities, included in “Other long-term liabilities”

(23.3)

(68.9)

Amounts recognized in other comprehensive income—pre-tax

Other Comprehensive Income (Loss), before Reclassifications, before Tax

(12.4)

10.2

2.9

Reclassification from accumulated other comprehensive income, current period, before tax

8.1

9.7

6.0

Defined Benefit Plan, Accumulated Benefit Obligation

296.5

343.2

Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]

Accumulated benefit obligations

248.8

287.9

Fair value of plan assets

222.4

207.7

Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation

248.8

288.7

Plans with Projected Benefit Obligations in Excess of Plan Assets [Abstract]

Fair value of plan assets

222.4

207.7

Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]

Net actuarial loss

(4.7)

Prior service cost

0.5

Total

5.2

Benefits Expected to be Paid from Benefit Plans [Abstract]

22.4

20.3

20.4

19.6

20.1

96.6

Defined Benefit Plan, Plan Assets, Benefits Paid

32.2

18.2

Multi-strategy Funds

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[1]

82.5

Fair value of plan assets, end of year balance

35.0

82.5

^[1]

Domestic stock funds

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[2]

56.2

Fair value of plan assets, end of year balance

^[2]

22.3

56.2

International stock funds

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[2]

43.1

Fair value of plan assets, end of year balance

^[2]

13.2

43.1

Domestic bond funds

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[2]

40.2

Fair value of plan assets, end of year balance

27.1

^[3]

40.2

^[2]

Significant Unobservable Inputs (Level 3)

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

12.9

Fair value of plan assets, end of year balance

12.7

12.9

Significant Unobservable Inputs (Level 3) | Multi-strategy Funds

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[1]

12.9

Fair value of plan assets, end of year balance

0.0

12.9

^[1]

Significant Unobservable Inputs (Level 3) | Domestic stock funds

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[2]

0.0

Fair value of plan assets, end of year balance

^[2]

0.0

Significant Unobservable Inputs (Level 3) | International stock funds

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[2]

0.0

Fair value of plan assets, end of year balance

^[2]

0.0

Significant Unobservable Inputs (Level 3) | Domestic bond funds

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[2]

0.0

Fair value of plan assets, end of year balance

^[2]

0.0

Fair Value, Inputs, Level 1 [Member]

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

147.5

Fair value of plan assets, end of year balance

101.5

147.5

Fair Value, Inputs, Level 1 [Member] | Multi-strategy Funds

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[1]

69.6

Fair value of plan assets, end of year balance

35.0

69.6

^[1]

Fair Value, Inputs, Level 1 [Member] | Domestic stock funds

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[2]

42.2

Fair value of plan assets, end of year balance

^[2]

22.3

42.2

Fair Value, Inputs, Level 1 [Member] | International stock funds

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[2]

15.5

Fair value of plan assets, end of year balance

^[2]

13.2

15.5

Fair Value, Inputs, Level 1 [Member] | Domestic bond funds

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[2]

20.2

Fair value of plan assets, end of year balance

^[2]

27.1

20.2

Fair Value, Inputs, Level 2

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

105.5

Fair value of plan assets, end of year balance

160.6

105.5

Fair Value, Inputs, Level 2 | Multi-strategy Funds

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[1]

0.0

Fair value of plan assets, end of year balance

0.0

^[1]

Fair Value, Inputs, Level 2 | Domestic stock funds

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[2]

14.0

Fair value of plan assets, end of year balance

^[2]

0.0

14.0

Fair Value, Inputs, Level 2 | International stock funds

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[2]

27.6

Fair value of plan assets, end of year balance

^[2]

0.0

27.6

Fair Value, Inputs, Level 2 | Domestic bond funds

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[2]

20.0

Fair value of plan assets, end of year balance

^[2]

0.0

20.0

Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]

Amounts recognized in other comprehensive income—pre-tax

Other Comprehensive Income (Loss), before Reclassifications, before Tax

0.0

Reclassification from accumulated other comprehensive income, current period, before tax

0.5

Total

(7.4)

(7.9)

(8.4)

Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]

Amounts recognized in other comprehensive income—pre-tax

Other Comprehensive Income (Loss), before Reclassifications, before Tax

4.1

3.2

Reclassification from accumulated other comprehensive income, current period, before tax

8.1

9.8

Total

(123.8)

(136.0)

(149.0)

Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]

Amounts recognized in other comprehensive income—pre-tax

Other Comprehensive Income (Loss), before Reclassifications, before Tax

4.1

3.2

(5.3)

Reclassification from accumulated other comprehensive income, current period, before tax

7.6

9.3

5.5

Total

(116.4)

(128.1)

$ (140.6)

Defined Benefit, US Plans [Member]

Change in Benefit Obligation [Roll Forward]

Beginning of year balance

272.6

End of year balance

244.8

272.6

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

207.7

Employer contribution

33.2

Fair value of plan assets, end of year balance

222.4

207.7

Funded status

$ (22.4)

$ (64.9)

Weighted average assumptions for obligations as of measurement date [Abstract]

Discount rate

4.20%

3.50%

Defined Benefit, Canadian Plans [Member]

Change in Benefit Obligation [Roll Forward]

Beginning of year balance

$ 58.1

End of year balance

49.0

$ 58.1

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

58.2

Fair value of plan assets, end of year balance

52.4

58.2

Funded status

$ 3.4

$ 0.1

Weighted average assumptions for obligations as of measurement date [Abstract]

Discount rate

3.80%

3.30%

Rate of compensation increase

3.50%

Defined Benefit, SERP [Member]

Change in Benefit Obligation [Roll Forward]

Beginning of year balance

$ 14.8

End of year balance

2.9

$ 14.8

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

0.0

Fair value of plan assets, end of year balance

0.0

Funded status

$ (2.9)

$ (14.8)

Weighted average assumptions for obligations as of measurement date [Abstract]

Discount rate

2.90%

Rate of compensation increase

3.00%

[1]	The multi-strategy funds invest in various hedge funds that employ a fund of funds strategy.
[2]	Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.
[3]	Fixed income investments include investments in funds that are primarily invested in a diversified portfolio of investment grade U.S. and international debt securities.

Retirement Plans and Post Retirement Benefits Pension Costs, Assumptions Used in Net Periodic Costs and Expected Contributions and Payments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 2.6	$ 4.9	$ 4.3
Interest cost	11.1	12.5	13.1
Expected return on plan assets	(13.9)	(13.1)	(13.1)
Amortization of prior service cost	0.5	0.5	0.5
Amortization of net actuarial loss	6.3	6.2	5.4
Net periodic pension cost before settlement	6.6	11.0	10.2
Loss due to settlement	0.1	3.1	0.0
Net periodic pension cost	6.7	14.1	10.2
Net periodic pension cost included in cost of sales	1.6	3.6	3.2
Net periodic pension cost included in selling, general, and administrative expenses	1.0	1.3	1.1
Net periodic pension cost included in other non-operating items	$ 4.1	$ 9.2	$ 5.9
Defined Benefit, Canadian Plans [Member]
Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.30%	3.70%	3.80%
Expected return on plan assets	4.10%	3.80%	3.80%
Rate of compensation increase	3.50%	3.50%	3.50%
Defined Benefit, SERP [Member]
Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate		2.70%	2.80%
Rate of compensation increase		3.00%	3.00%
Defined Benefit, US Plans [Member]
Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.50%	4.00%	4.20%
Expected return on plan assets	5.80%	5.80%	5.80%

Retirement Plans and Post Retirement Benefits Level 3 Rollforward (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2018

Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward]

Fair value of plan assets, beginning of year balance

$ 265.9

$ 239.9

Fair value of plan assets, end of year balance

265.9

239.9

$ 274.8

Multi-strategy Funds

Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[1]

82.5

Fair value of plan assets, end of year balance

82.5

^[1]

35.0

Significant Unobservable Inputs (Level 3)

Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward]

Fair value of plan assets, beginning of year balance

12.9

Fair value of plan assets, end of year balance

12.9

12.7

Significant Unobservable Inputs (Level 3) | Multi-strategy Funds

Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[1]

12.9

Fair value of plan assets, end of year balance

12.9

^[1]

0.0

Net Asset Value, previously Level 3 [Member] | Multi-strategy Funds

Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) [Roll Forward]

Fair value of plan assets, beginning of year balance

12.9

12.2

Total unrealized gains (losses)

(0.2)

0.7

Defined Benefit Plan, Redemptions

0.2

(0.1)

Defined Benefit Plan, Mangement Fees

(0.2)

(0.1)

Fair value of plan assets, end of year balance

$ 12.9

$ 12.2

$ 12.7

^[2]

[1]	The multi-strategy funds invest in various hedge funds that employ a fund of funds strategy.
[2]	Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.

Retirement Plans and Post Retirement Benefits Defined Contribution Plans and Other Benefit Plans (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Contribution Plans [Abstract]
Expenses related to defined contribution plans and multiemployer plan	$ 10.1	$ 9.7	$ 8.7
Funded status	$ (21.9)	(79.6)
Deferred Compensation Arrangements [Abstract]
Deferred compensation plan maximum deferral percentage	90.00%
Deferred compensation plan, employer contributions and related earnings, maximum vesting period	5 years
Deferred compensation liability included in "Other long-term liabilities"	$ (1.1)	(1.9)
US Defined Contribution Plan [Member]
Defined Contribution Plans [Abstract]
Maximum percentage of employee's wages eligible for company match	5.00%
Shares of LP common stock included in plan assets	1.3
Total market value of plan assets represented by LP common stock	7.50%
Canadian Defined Contribution Plan [Member]
Defined Contribution Plans [Abstract]
Maximum percentage of employee's wages eligible for company match	3.00%
Percentage of base contribution	2.50%
Employer matching percentage	50.00%
Other Postretirement Benefits
Defined Contribution Plans [Abstract]
Funded status	$ 8.6	$ 9.0

Accumulated Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	$ (4.4)		$ 15.9
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax	(3.1)	$ (4.5)	(0.3)
Accumulated comprehensive loss, net of tax, beginning of period	(146.4)	(122.1)	(137.2)	$ (146.1)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(12.4)	10.2	2.9
Other Comprehensive Income (Loss) before Reclassifications, Tax	1.3	1.4	(2.2)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(13.7)	8.8	5.1
Reclassification from accumulated other comprehensive income, current period, before tax	8.1	9.7	6.0
Reclassification from AOCI, Current Period, Tax	(2.0)	(3.4)	(2.2)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	6.1	6.3	3.8
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(7.6)	15.1	8.9
Accumulated comprehensive loss, net of tax, end of period	(146.4)	(122.1)	(137.2)	(146.1)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated comprehensive loss, net of tax, beginning of period	(57.0)	(39.7)	(46.3)	(55.1)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(17.3)	6.6	8.8
Other Comprehensive Income (Loss) before Reclassifications, Tax	0.0	0.0	0.0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(17.3)	6.6	8.8
Reclassification from accumulated other comprehensive income, current period, before tax	0.0	0.0	0.0
Reclassification from AOCI, Current Period, Tax	0.0	0.0	0.0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.0	0.0	0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(17.3)	6.6	8.8
Accumulated comprehensive loss, net of tax, end of period	(57.0)	(39.7)	(46.3)	(55.1)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	(17.4)
Accumulated comprehensive loss, net of tax, beginning of period	(88.2)	(79.5)	(87.7)	(87.8)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	4.1	3.2	(5.3)
Other Comprehensive Income (Loss) before Reclassifications, Tax	1.1	1.1	(1.9)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	3.0	2.1	(3.4)
Reclassification from accumulated other comprehensive income, current period, before tax	7.6	9.3	5.5
Reclassification from AOCI, Current Period, Tax	(1.9)	(3.2)	(2.0)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	5.7	6.1	3.5
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	8.7	8.2	0.1
Accumulated comprehensive loss, net of tax, end of period	(88.2)	(79.5)	(87.7)	(87.8)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated comprehensive loss, net of tax, beginning of period	(4.5)	(4.9)	(5.2)	(5.5)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0.0	0.0	0.0
Other Comprehensive Income (Loss) before Reclassifications, Tax	0.0	0.0	0.0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0.0	0.0	0.0
Reclassification from accumulated other comprehensive income, current period, before tax	0.5	0.5	0.5
Reclassification from AOCI, Current Period, Tax	(0.1)	(0.2)	(0.2)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.4	0.3	0.3
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0.4	0.3	0.3
Accumulated comprehensive loss, net of tax, end of period	(4.5)	(4.9)	(5.2)	(5.5)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	0.7
Accumulated comprehensive loss, net of tax, beginning of period	4.3	3.5	2.7	3.3
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0.1	1.3	(1.0)
Other Comprehensive Income (Loss) before Reclassifications, Tax	0.0	0.5	(0.4)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0.1	0.8	(0.6)
Reclassification from accumulated other comprehensive income, current period, before tax	0.0	0.0	0.0
Reclassification from AOCI, Current Period, Tax	0.0	0.0	0.0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.0	0.0	0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0.1	0.8	(0.6)
Accumulated comprehensive loss, net of tax, end of period	4.3	3.5	2.7	3.3
Accumulated Other Post Retirement Benefits Adjustment, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated comprehensive loss, net of tax, beginning of period	(1.0)	(1.5)	(0.7)	(1.0)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0.7	(0.9)	0.4
Other Comprehensive Income (Loss) before Reclassifications, Tax	0.2	(0.2)	0.1
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0.5	(0.7)	0.3
Reclassification from accumulated other comprehensive income, current period, before tax	0.0	(0.1)	0.0
Reclassification from AOCI, Current Period, Tax	0.0	0.0	0.0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.0	(0.1)	0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0.5	(0.8)	0.3
Accumulated comprehensive loss, net of tax, end of period	(1.0)	$ (1.5)	$ (0.7)	$ (1.0)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	$ (16.7)

Selected Segment Data (Details) - USD ($) $ in Millions	12 Months Ended
Selected Segment Data (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 2,828.0	$ 2,733.9	$ 2,233.4
Income from operations	526.1	532.8	210.2
Other operating credits and charges, net	2.2	(4.9)	(17.4)
(Gain) loss on sale or impairment of long-lived assets	(10.8)	(6.8)	8.4
Other General Expense	(111.7)	(108.1)	(102.3)
Other Nonoperating Income (Expense)	(3.9)	(13.8)	(21.4)
Foreign currency gains (losses)	0.4	(4.4)	2.1
Investment income	17.6	10.5	8.2
Interest expense, net of capitalized interest	(15.8)	(19.3)	(32.1)
Loss from continuing operations before taxes	521.1	510.2	170.1
Provision (benefit) for income taxes	(122.3)	(119.1)	(19.8)
Income from continuing operations	398.8	391.1	150.3
Depreciation and amortization	120.0	123.3	112.8
Capital Expenditures	214.2	148.6	124.8
Siding
Segment Reporting Information [Line Items]
Net sales	942.3	884.0	752.3
Income from operations	201.6	188.7	128.0
Depreciation and amortization	32.3	30.9	27.4
Capital Expenditures	117.1	63.0	49.9
OSB
Segment Reporting Information [Line Items]
Net sales	1,305.2	1,302.5	1,027.7
Income from operations	395.7	427.3	187.8
Depreciation and amortization	58.3	61.6	58.6
Capital Expenditures	54.9	58.4	49.3
Engineered Wood Products
Segment Reporting Information [Line Items]
Net sales	390.9	365.9	296.9
Income from operations	19.5	15.7	(4.6)
Depreciation and amortization	15.1	15.8	12.7
Capital Expenditures	9.9	6.0	5.3
South America
Segment Reporting Information [Line Items]
Net sales	160.8	155.3	136.9
Income from operations	31.0	24.3	17.0
Depreciation and amortization	9.1	9.1	8.6
Capital Expenditures	28.3	17.5	8.7
Other
Segment Reporting Information [Line Items]
Net sales	28.9	30.0	26.9
Income from operations	(4.3)	(3.4)	(1.5)
Depreciation and amortization	2.0	2.8	2.3
Capital Expenditures	1.2	1.0	8.1
Intersegment sales
Segment Reporting Information [Line Items]
Net sales	(0.1)	(3.8)	(7.3)
Unallocated Amount to Segment
Segment Reporting Information [Line Items]
Depreciation and amortization	3.2	3.1	3.2
Capital Expenditures	$ 2.8	$ 2.7	$ 3.5

Segment Information Identifiable assets (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Assets	$ 2,514.1	$ 2,448.5
OSB
Assets	578.6	577.5
Siding
Assets	487.1	371.8
Engineered Wood Products
Assets	122.9	116.3
South America
Assets	113.6	95.9
Other
Assets	63.6	93.7
Unallocated Amount to Segment
Assets	$ 1,148.3	$ 1,193.3

Segment Information Geographic Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Sales	$ 2,828.0	$ 2,733.9	$ 2,233.4
Operating Income (Loss)	526.1	532.8	210.2
Other operating credits and charges, net and gain (loss) on sales of and impairments of long-lived assets	(9.0)	(12.0)	(9.0)
General corporate expense, loss on early debt extinguishment, other income(expense) and interest, net	114.0	(131.0)	(148.0)
Income (loss) from continuing operations before income taxes, extraordinary items, noncontrolling interest	521.1	510.2	170.1
Provision for income taxes	122.3	119.1	19.8
Income (loss) from continuing operations	398.8	391.1	150.3
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	1,073.0	982.0	938.0
South America
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Sales	160.8	155.3	136.9
Operating Income (Loss)	31.0	24.3	17.0
UNITED STATES
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Sales	2,409.0	2,307.0	1,882.0
Operating Income (Loss)	475.0	462.0	239.0
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	540.0	529.0	516.0
CANADA
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Sales	861.0	704.0	682.0
Operating Income (Loss)	138.0	167.0	71.0
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	449.0	380.0	365.0
South America
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Sales	174.0	165.0	137.0
Operating Income (Loss)	31.0	24.0	17.0
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	84.0	73.0	57.0
Intersegment sales
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Sales	$ (616.0)	$ (442.0)	$ (468.0)