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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2017	Feb. 13, 2018	Jun. 30, 2017
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, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		144,949,753
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 3,437,713,529

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 928.0	$ 659.3
Receivables, net of allowance for doubtful accounts of $0.9 million and $1.0 million at December 31, 2017 and 2016	142.5	108.3
Inventories	259.1	234.6
Prepaid expenses and other current assets	7.8	6.1
Notes, Loans and Financing Receivable, Net, Current	22.2	0.0
Total current assets	1,359.6	1,008.3
Timber and timberlands	55.7	53.5
Net property, plant and equipment	926.1	891.4
Goodwill and other intangible assets	26.7	9.7
Notes receivable from asset sales	0.0	22.2
Investments in and advances to affiliates	7.8	6.2
Restricted cash	13.3	13.2
Other assets	56.8	22.4
Long-term deferred tax asset	2.5	4.3
Total assets	2,448.5	2,031.2
LIABILITIES AND EQUITY
Current portion of long-term debt	25.1	2.6
Accounts payable and accrued liabilities	237.1	191.5
Accrued Income Taxes, Current	4.5	31.3
Current portion of contingency reserves	3.4	3.4
Total current liabilities	270.1	228.8
Long-term debt, excluding current portion	350.8	374.4
Deferred income taxes	33.4	27.7
Contingency reserves, excluding current portion	11.7	12.7
Other long-term liabilities	178.0	191.9
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 and 153,358,542 shares issued	153.4	153.4
Additional paid-in capital	470.6	478.2
Retained earnings	1,280.1	890.3
Treasury stock, 8,462,949 shares and 9,041,733 shares, at cost	(177.5)	(189.0)
Accumulated comprehensive loss	(122.1)	(137.2)
Total stockholders' equity	1,604.5	1,195.7
Total liabilities and stockholders' equity	$ 2,448.5	$ 2,031.2

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 0.9	$ 1.0
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	153,147,190	152,979,708
Common Stock, Shares, Outstanding	144,895,593	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	8,462,949	9,041,733

Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net sales	$ 2,733.9	$ 2,233.4	$ 1,892.5
Operating costs and expenses:
Cost of sales	1,882.0	1,724.0	1,682.7
Depreciation and amortization	123.3	112.8	101.9
Selling and administrative	190.4	183.6	152.8
(Gain) loss on sale or impairment of long lived assets, net	6.8	(8.4)	2.1
Other operating credits and charges, net	8.0	17.4	16.3
Total operating costs and expenses	2,210.5	2,029.4	1,955.8
Income (loss) from operations	523.4	204.0	(63.3)
Non-operating income (expense):
Interest expense, net of capitalized interest	(19.3)	(32.1)	(31.2)
Investment income	10.5	8.2	4.4
Other nonoperating items	(4.4)	(15.2)	(5.3)
Total non-operating income (expense)	(13.2)	(39.1)	(32.1)
Income (loss) from continuing operations before income taxes	510.2	164.9	(95.4)
Provision (benefit) for income taxes	119.1	19.8	(2.7)
Equity in income of unconsolidated affiliates	0.0	(5.2)	(6.7)
Income (loss) from continuing operations	391.1	150.3	(86.0)
Loss from discontinued operations before taxes	(2.0)	(0.8)	(3.2)
Benefit for income taxes	(0.7)	(0.3)	(1.1)
Loss from discontinued operations	(1.3)	(0.5)	(2.1)
Net income (loss)	$ 389.8	$ 149.8	$ (88.1)
Basic net income (loss) per share:
Income (loss) per share from continuing operations	$ 2.71	$ 1.05	$ (0.60)
Loss per share from discontinued operations	(0.01)	(0.01)	(0.02)
Net income (loss) per share	2.70	1.04	(0.62)
Diluted net earnings (loss) per share:
Income (loss) per share from continuing operations	2.67	1.03	(0.60)
Loss per share from discontinued operations	(0.01)	0.00	(0.02)
Net income (loss) per share	$ 2.66	$ 1.03	$ (0.62)
Weighted average number of shares outstanding - basic	144.4	143.4	142.4
Weighted average number of shares outstanding, diluted	146.4	145.3	142.4
Retained Earnings
Non-operating income (expense):
Net income (loss)	$ 389.8	$ 149.8	$ (88.1)

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income (loss)	$ 389.8	$ 149.8	$ (88.1)
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment	6.6	8.8	(21.4)
Unrealized gain (losses) on securities, net of reversals	0.8	(0.6)	0.7
Defined benefit pension and post retirement plans:
Change benefit obligations, translation adjustment	(0.4)	(0.5)	1.2
Prior service cost	0.0	0.0	0.0
Net gain (loss)	2.5	(2.9)	(0.4)
Amortization of actuarial loss, net of tax	6.1	3.5	4.6
Amortization of prior service cost, net of tax	0.3	0.3	0.3
Other	(0.8)	0.3	0.2
Other comprehensive income (loss), net of tax	15.1	8.9	(14.8)
Comprehensive income (loss)	$ 404.9	$ 158.7	$ (102.9)

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 389.8	$ 149.8	$ (88.1)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	123.3	112.8	101.9
Equity in income (loss) of unconsolidated affiliates, including dividends	(0.8)	1.5	(3.7)
Other operating credits and charges, net	8.0	17.4	16.3
(Gain) loss on sale or impairment of long-lived assets, net	6.8	(8.4)	2.1
Loss on early debt extinguishment	0.0	17.3	0.0
Stock-based compensation related to stock plans	9.7	13.0	9.3
Exchange (gain) loss on remeasurement	2.1	(2.0)	2.8
Cash settlements of warranty, net of accruals	(6.8)	(13.6)	(8.5)
Pension expense (payments), net of contributions	(1.8)	3.7	6.0
Non-cash interest expense, net	0.4	3.8	0.8
Other adjustments, net	0.1	(1.1)	1.2
(Increase) decrease in receivables	(35.0)	(8.9)	10.6
(Increase) decrease in inventories	(22.7)	(11.0)	3.5
(Increase) decrease in prepaid expenses	(1.6)	1.0	2.2
Increase (decrease) in accounts payable and accrued liabilities	22.5	53.8	(20.3)
Increase (decrease) in deferred income taxes	(20.3)	13.2	(6.9)
Net cash provided by operating activities	473.7	342.3	29.2
CASH FLOWS FROM INVESTING ACTIVITIES:
Property, plant, and equipment additions	(148.6)	(124.8)	(113.8)
Proceeds from asset sales	3.2	0.3	0.5
Payments to Acquire Businesses, Net of Cash Acquired	(20.8)	0.0	0.0
Investment in and refunds from joint ventures	0.0	0.0	1.1
Receipt of proceeds from notes receivable from asset sales	0.0	410.0	0.0
Payment of long-term deposit	(32.0)	0.0	0.0
(Increase) decrease in restricted cash under letters of credit	0.0	1.2	(3.9)
Other investing activities, net	(0.4)	(0.4)	0.2
Net cash provided by (used in) investing activities	(198.6)	286.3	(115.9)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of long-term debt	0.0	350.0	0.0
Repayment of long term debt	(2.6)	(742.5)	(2.3)
Payment of debt issuance fees	(0.5)	(5.2)	0.0
Taxes paid related to net share settlement of equity awards	(5.9)	(9.2)	(6.1)
Sale of common stock, net of cash payments under equity plans	(0.4)	(0.1)	0.7
Other financing activities, net	0.0	0.0	3.3
Net cash used in financing activities	(9.4)	(407.0)	(4.4)
Effect of exchange rate on cash and cash equivalents	3.0	3.0	(6.9)
Net increase (decrease) in cash and cash equivalents	268.7	224.6	(98.0)
Cash and cash equivalents at beginning of year	659.3	434.7	532.7
Cash and cash equivalents at end of year	$ 928.0	$ 659.3	$ 434.7

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, 2014	$ 1,115.8	$ 152.8	$ (225.0)	$ 507.0	$ 812.3	$ (131.3)
Balance, Beginning, Shares at Dec. 31, 2014		152,800,000	10,600,000
Net income (loss)	(88.1)				(88.1)
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	(0.9)		$ (20.5)	(19.6)
Amortization of restricted stock grants	1.8			1.8
Exercise of stock warrants, shares		200,000
Exercise of stock warrants, amount	0.0	$ 0.2		(0.2)
Compensation expense associated with stock awards	7.5			7.5
Taxes paid related to net settlement of equity awards, shares			400,000
Taxes paid related to net share settlement of equity awards	(6.1)		$ (6.1)
Tax benefit of employee stock plan transactions	(6.1)
Other comprehensive loss	(14.8)					(14.8)
Balance, Ending, Shares at Dec. 31, 2015		153,000,000	10,000,000
Balance, Ending at Dec. 31, 2015	1,017.0	$ 153.0	$ (210.6)	496.5	724.2	(146.1)
Cumulative effect of adoption of accounting principle	15.9			(0.4)	16.3
Net income (loss)	149.8				149.8
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)
Amortization of restricted stock grants	2.4			2.4
Exercise of stock warrants, shares		400,000
Exercise of stock warrants, amount	0.0	$ 0.4		(0.4)
Compensation expense associated with stock awards	10.5			10.5
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)
Tax benefit of employee stock plan transactions	(9.2)
Other comprehensive loss	$ 8.9					8.9
Balance, Ending, Shares at Dec. 31, 2016	143,169,626	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 (loss)	389.8				389.8
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)
Amortization of restricted stock grants	1.5			1.5
Compensation expense associated with stock awards	8.0			8.0
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)
Tax benefit of employee stock plan transactions	(6.2)
Other comprehensive loss	$ 15.1					15.1
Balance, Ending, Shares at Dec. 31, 2017	144,895,593	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)

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2017

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]

Significant Accounting Policies [Text Block]


1.	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of Operations

Louisiana-Pacific Corporation and its subsidiaries are principally engaged in the manufacture of building products. In addition to our U.S. operations, the Company also maintains manufacturing facilities in Canada, Chile and Brazil through foreign subsidiaries and a joint venture. 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 after elimination of intercompany transactions. The equity method of accounting is used for joint ventures and investments in associated companies over which we have significant influence but do not have control. Significant influence is deemed to exist generally when the Company has an ownership interest in the voting stock of an investee of between 20 percent and 50 percent. Our equity in the income and losses of these investments is recorded in “Equity in income of unconsolidated affiliates” on the Consolidated Statements of Income for years ended December 31, 2016 and 2015. Our equity in income and losses of these investments is recorded in "Cost of sales" for the year ended December 31, 2017. See Note 9 for further discussion of these investments and advances. We have a variable interest in our Resolute-LP equity method investee but we are not considered to be the primary beneficiary.

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. We may invest in securities including U.S. treasury notes, bank obligations, corporate obligations, auction rate securities and commercial paper. Under our investment criteria at purchase, bank and corporate obligations carry a rating of at least A-1 and commercial paper must have the highest rating obtainable from one or more rating agencies. 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 3 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 the our log inventories with the remaining inventories valued at FIFO (first-in, first-out) or average cost. Inventory consists of the following:



	December 31,
Dollar amounts in millions	2017		2016
Logs	$	60.3	$	54.6
Other raw materials	20.8		23.0
Semi finished inventory	24.3		16.8
Finished products	153.7		140.2
Total	$	259.1	$	234.6

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. Cost of timber harvested also includes the amortization of the timber licenses. See Note 8 for further discussion.

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	2017		2016		2015
Cost of sales	$	120.1	$	109.6	$	98.9
Selling and administrative	3.2		3.2		3.0
Total depreciation and amortization	$	123.3	$	112.8	$	101.9

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 $2.2 million in 2017 and $1.9 million 2016.

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



Dollar amounts in millions	December 31,
Dollar amounts in millions	2017			2016
Property, plant and equipment, at cost:
Land, land improvements and logging roads, net of road amortization	$	162.7		$	154.4
Buildings	347.5			331.2
Machinery and equipment	1,977.4			1,934.1
Construction in progress	98.5			48.7
	2,586.1			2,468.4
Accumulated depreciation	(1,660.0		)	(1,577.0		)
Property, plant and equipment, net	$	926.1		$	891.4

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 18 for a discussion of charges in 2017, 2016 and 2015 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.

We continue to review certain operations and investments for potential impairments. Our management currently believes we have adequate support for the carrying value of each of these operations and investments based upon the anticipated cash flows that result from estimates of future demand, pricing and production costs assuming certain levels of planned capital expenditures. As of December 31, 2017, the fair values of our facilities were in excess of their carrying value, which supported the conclusion that no impairment is necessary for those facilities. However, if demand and pricing for the relevant products continues at levels significantly below cycle average demand and pricing, or should we decide to invest capital in alternative projects, or should changes occur related to our wood supply for these locations, it is possible that impairment charges will be required.

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.

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 16 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 15 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 Chilean and Brazilian subsidiaries are the Chilean peso and Brazilian real and 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.

Revenue Recognition

Revenue is recognized when title has passed. The following criteria are used to determine that title has passed: (1) persuasive evidence of an arrangement exists; (2) delivery has occurred or services have been rendered; (3) the price to the buyer is fixed or determinable; and (4) the collection is reasonably assured.

During 2017, 2016 and 2015, LP's top ten customers accounted for approximately 46%, 41% and 45% of its sales in the aggregate. No individual customers exceeded 10% of LP's sales in 2017, 2016 or 2015.

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 in either net sales or the category selling, and administrative expenses at the time the program is initiated and/or the revenue is recognized. The costs are predominantly recognized in net sales and include, but are not limited to, volume allowances and rebates and promotional allowances. These costs 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, 2017 and 2016, we had $24.2 million and $19.3 million accrued as customer rebates recorded in Accounts Payable on our Consolidated Balance Sheets.

We ship some of our products to retailers’ 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, 2017 and 2016 was $18.3 million and $15.8 million.

Advertising costs

Advertising costs, which amounted to $19.1 million, $19.6 million and $15.5 million in 2017, 2016 and 2015, 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 17 for a discussion of specific amounts in 2017, 2016 and 2015.

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 14 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, 2017
Present and Prospective Accounting Pronouncement [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	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. The new standard is effective on January 1, 2019. LP is currently evaluating the effect that adopting this new accounting guidance will have on its consolidated results of operations and financial position. In August 2016, the FASB issued ASU 2016-15, "Statement of Cash Flows (Topic 230): Classifications of Certain Cash Receipts and Cash Payments." The standard provides guidance for eight changes with respect to how cash receipts and cash payments are classified in the statement of cash flows, with the objective of reducing diversity in practice. The new standard is effective January 1, 2018, with early adoption permitted. 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. LP does not expect the adoption of this new standard to have a material impact on its consolidated results of operations and financial position. In November 2016, the FASB issued ASU 2016-18, "Statement of Cash Flows (Topic 230): Restricted Cash." This standard provides guidance that requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. The new standard is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. In May 2014, the FASB issued Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers (Topic 606), which supersedes the revenue recognition requirements in Accounting Standards Codification (ASC) 605, Revenue Recognition. The new revenue recognition standard requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. The ASU 2014-09 will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The new standard is effective on January 1, 2018. we have elected to adopt the revenue recognition standard in the first quarter of 2018 using the modified retrospective transition method with a cumulative adjustment to its opening balance of retained earnings. The adoption of this standard will not have a material impact on LP’s financial statements. 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 its consolidated results of operations and financial position. In March 2017, the FASB issued ASU 2017-07, Compensation—Retirement Benefits (Topic 715). The standard amends the requirements in ASC 715 related to the income statement presentation of the components of net periodic benefit cost for an entity's sponsored defined benefit pension and other post-retirement plans. The new standard is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. In May 2017, the FASB issued ASU 2017-09, Modification Accounting for Share-Based Payment Arrangements. The standard amends the scope of modification accounting for share-based payment arrangements and provides guidance on the types of changes to the terms or conditions of share-based payment awards to which an entity would be required to apply modification accounting under ASC 718. The new standard is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. LP does not expect the adoption of this new standard to have a material impact on its consolidated results of operations and financial position.

Investments

12 Months Ended

Dec. 31, 2017

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, 2017 and December 31, 2016:



Dollar amounts in millions	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
December 31, 2017	$	0.4	$	5.6	$	—	$	6.0

December 31, 2016	$	0.4	$	4.4	$	—	$	4.8

As of December 31, 2017, we had $6.0 million ($23.4 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, 2017 exceed one year.

There were no purchases of short-term and long-term investments for the years ended December 31, 2017 and 2016. During 2017 and 2016, we did not own any short-term investments.

Fair Value Measurements

12 Months Ended

Dec. 31, 2017

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, 2017 and 2016 is summarized in the following tables.



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		—		—



Dollar amounts in millions	December 31, 2016		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	$	4.8	$	—	$	—	$	4.8
Trading securities	2.6		2.6		—		—

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, 2017 and 2016.



Dollar amounts in millions	Available for sale securities
Balance at December 31, 2015	$	5.8
Total realized/unrealized gains (losses) included in other comprehensive income	(1.0		)
Balance at December 31, 2016	$	4.8
Total realized/unrealized gains (losses) included in other comprehensive income	1.2
Balance at December 31, 2017	$	6.0

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 on Notes Receivable from Asset Sales at Note 7 and Long-term Debt at 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.

During 2016, we entered into a non-monetary transaction to exchange our idled OSB mill for another idled mill. This transaction was recorded at the fair market value of both facilities based upon external appraisals. This transaction resulted in us recording a gain of $10.6 million equal to the excess fair value over the net book value of the facility being exchanged.

- 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, 2017

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 (employee stock options, stock settled stock appreciation rights, incentive shares, 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	2017	2016	2015
Denominator for basic earnings per share:
Weighted average common shares outstanding	144.4	143.4	142.4
Effect of dilutive securities:
Dilutive effect of employee stock plans	2.0	1.7	—
Dilutive effect of stock warrants	—	0.2	—
Dilutive potential common shares	2.0	1.9	—
Denominator for diluted earnings per share:
Adjusted weighted average shares	146.4	145.3	142.4

Stock options, warrants and SSARs related 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 for the years ended December 31, 2017 and December 31, 2016.

Stock options, warrants, SSARs and performance shares related to approximately 4.9 million common shares for the year ended December 31, 2015 were considered anti-dilutive for purposes of our earnings per share calculation due to LP’s loss position from continuing operations.

Receivables

12 Months Ended

Dec. 31, 2017

Receivables [Abstract]

Receivables

RECEIVABLES

Receivables consist of the following:



	December 31,
Dollar amounts in millions	2017			2016
Trade receivables	$	124.6		$	96.1
Income tax receivable	2.2			1.7
Other receivables	16.6			11.5
Allowance for doubtful accounts	(0.9		)	(1.0		)
	$	142.5		$	108.3

Other receivables at December 31, 2017 and 2016 primarily consist of sales tax receivables, vendor rebates, interest receivables, a receivable associated with an affiliate and other miscellaneous receivables.

- 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

Notes Receivable from Asset Sales

12 Months Ended

Dec. 31, 2017

Notes Receivable from Asset Sales [Abstract]

Notes Receivables From Asset Sales [Text Block]


.	NOTES RECEIVABLE FROM ASSET SALES

Notes receivable from asset sales are related to a transaction that occurred during 1998. The note receivable provides collateral for our limited recourse note payable (see Note 13). We monitor the collectability of this note on a regular basis.



Dollar amounts in millions	Interest Rate 2017		December 31,
Dollar amounts in millions	Interest Rate 2017		2017		2016
Notes receivable (secured), maturing 2018, interest rates fixed	7.3	%	$	22.2	$	22.2
Total			22.2		22.2
Current portion			22.2		—
Long-term portion			$	—	$	22.2

We estimate that the fair value of this note at December 31, 2017 and December 31, 2016 was approximately $22.7 million and $23.4 million.

Other Intangible Assets

12 Months Ended

Dec. 31, 2017

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, 2017 and 2016 are provided in the following table:



Dollar amounts in millions	2017											2016
	Timber and timberlands			Goodwill		Developed Technology			Total			Timber and timberlands			Goodwill		Total
Beginning balance December 31,	$	47.1		$	9.7	$	—		$	56.8		$	50.4		$	9.7	$	60.1
Additions	—			6.4		11.0			$	17.4		—					—
Amortization	(3.2		)	—		(0.4		)	(3.6		)	(3.3		)	—		(3.3		)
Total goodwill and other intangibles	$	43.9		$	16.1	$	10.6		$	70.6		$	47.1		$	9.7	$	56.8

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,
2018	$	3.8
2019	3.8
2020	3.8
2021	3.8
2022	3.8

Investments in and Advances to Affiliates	12 Months Ended
Investments in and Advances to Affiliates	Dec. 31, 2017
Related Party Transactions [Abstract]
Transactions with Affiliates	INVESTMENTS IN AND ADVANCES TO AFFILIATES At December 31, 2017, we 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, 2017, 2016 and 2015, we sold $15.5 million, $11.7 million and $9.3 million of products to Resolute-LP and purchased $60.1 million, $53.1 million and $54.1 million of I-joists from Resolute-LP. Included in the Consolidated Balance Sheets at December 31, 2017 and 2016 are $3.6 million and $1.9 million in accounts receivable and $1.2 million and $0.1 million in accounts payable associated with Resolute-LP. For the year ended December 31, 2017, we received $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. Based upon the change in legal structure which altered our tax structure, for the year ended December 31, 2017, we are classifying the income (loss) from the joint venture as a reduction in cost of sales. LP recorded income from affiliates of $4.0 million in 2017, $5.2 million in 2016 and $6.7 million in 2015.

Accounts Payable and Accrued Liabilities

12 Months Ended

Dec. 31, 2017

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	2017		2016
Accounts payable	$	112.3	$	89.9
Salaries and wages payable	75.8		58.7
Taxes other than income taxes	3.0		3.6
Current portion of warranty reserves	9.0		9.0
Accrued interest	6.0		5.4
Accrued rebates	24.2		19.3
Other accrued liabilities	6.8		5.6
Total Accounts payable and accrued liabilities	$	237.1	$	191.5

Other accrued liabilities at December 31, 2017 and 2016 primarily consist of reforestation liabilities, accrued rent, current portion of worker compensation liabilities and other items. Additionally, included in accounts payable is $19.0 million and $9.8 million related to capital expenditures that had not yet been paid as of December 31, 2017 and as of December 31, 2016.

Income Taxes

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Income Taxes

INCOME TAXES

Tax Cuts and Jobs Act

On December 22, 2017 the U.S. Government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Act”). The Act makes broad and complex changes to the U.S. tax code, including but not limited to, reducing the U.S. federal corporate rate from 35% to 21%, generally eliminating the taxation of dividends from foreign subsidiaries, imposing a one-time transition tax on unrepatriated earnings of foreign subsidiaries, creating new taxes on certain foreign earnings, allowing full expensing of qualified property acquired and placed in service after September 27, 2017, and imposing new limits on the deduction of net operating losses, executive compensation and net interest expense.

We have recognized the income tax effects of the Act in our financial statements for the year ended December 31, 2017 in accordance with Staff Accounting Bulletin No. 118, which provides SEC guidance for the application of ASC 740 - Income Taxes in the period in which the Act was signed into law. While we have not yet completed our analysis, based on reasonable assumptions and available information, we have recorded a provisional benefit of $18.4 million resulting from the reduction of our deferred tax liabilities to reflect the change in the corporate income tax rate from 35% to 21%. If additional tax deduction items which are temporary in nature are later identified, this will reduce our current federal taxes payable at 35% and increase our deferred federal tax liability at 21%, resulting in an additional benefit. We have also calculated a provisional amount of zero for the transition tax on unrepatriated foreign earnings.

We have not yet completed our analysis of the impact of the other provisions of the Act that could affect our financial statements for the year ended December 31, 2017, specifically the Global Intangible Low Taxed Income (GILTI) provisions. The GILTI rules require current inclusion of certain earnings of controlled foreign corporations in the income of the U.S. shareholder. Under U.S. GAAP we are allowed to make an accounting policy choice to either treat additional taxes due to GILTI on a current or deferred basis. If we were to choose the deferred method, our calculation of the deferred balance at December 31, 2017 would depend upon our analysis of foreign income and whether we expect to have GILTI inclusions in future years. Because of the complexity of these provisions and our continuing evaluation, we have not recorded any provisional amounts for this tax in our financial statements.

Income Tax Provision

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



	Year ended December 31,
Dollar amounts in millions	2017		2016		2015
Domestic	$	341.8	$	98.4	$	(8.7	)
Foreign	168.4		71.7		(80.0		)
Total	$	510.2	$	170.1	$	(88.7	)

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



	Year ended December 31,
Dollar amounts in millions	2017			2016			2015
Current tax provision (benefit):
U.S. federal	$	105.8		$	60.4		$	(2.4	)
State and local	4.4			4.4			(0.5		)
Foreign	7.9			10.4			2.6
Net current tax provision (benefit)	118.1			75.2			(0.3		)
Deferred tax provision (benefit):
U.S. federal	(19.3		)	(48.1		)	(1.1		)
State and local	8.0			1.2			(1.8		)
Foreign	38.2			11.7			(26.6		)
Net valuation allowance increase (decrease)	(25.9		)	(20.2		)	27.1
Net deferred tax benefit	1.0			(55.4		)	(2.4		)
Total income tax provision (benefit)	$	119.1		$	19.8		$	(2.7	)

We received income tax refunds during 2017, 2016 and 2015 of $0.3 million, $0.8 million and $0.1 million and paid cash taxes of $143.1 million, $8.7 million and $16 million. Included in the Consolidated Balance Sheets at December 31, 2017 and 2016 are income tax receivables of $2.2 million and $1.7 million and income taxes payable of $4.5 million and $31.3 million.

Deferred Taxes

The tax effects of significant temporary differences creating deferred tax (assets) and liabilities at December 31 were as follows:



	December 31,
Dollar amounts in millions	2017			2016
Accrued liabilities	53.4			83.9
Benefit of capital loss and NOL carryovers	38.9			83.4
Other	10.2			11.6
Inventories	6.6			6.9
Market value write down of ARS	4.9			8.8
Benefit of tax credit carryovers	3.5			3.7
Valuation allowance	(13.6		)	(37.9		)
Total deferred tax assets	103.9			160.4
Property, plant and equipment	(118.2		)	(164.2		)
Timber and timberlands	(11.4		)	(11.6		)
Installment sale gain deferral	(5.2		)	(8.0		)
Total deferred tax liabilities	(134.8		)	(183.8		)
Net deferred tax liabilities	$	(30.9	)	$	(23.4	)
Balance sheet classification
Long-term deferred tax asset	2.5			4.3
Long-term deferred tax liability	(33.4		)	(27.7		)
	$	(30.9	)	$	(23.4	)

The benefit relating to capital loss, net operating loss (NOL) and credit carryovers included in the above table at December 31, 2017 consists of:



Dollar amounts in millions	Expiration Beginning in	Benefit Amount		Valuation Allowance
State NOL carryovers	2018	14.1		(1.4		)
State credit carryovers	2018	0.7		(0.1		)
Canadian NOL carryovers	2034	16.7		—
Canadian capital loss carryovers	Indefinitely	6.2		(6.2		)
Canadian credit carryovers	2018	2.7		—
Chilean NOL carryovers	Indefinitely	2.0		(2.0		)
		$	42.4	$	(9.7	)

We periodically review the need for valuation allowances against deferred tax assets and recognizes 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 January 1, 2016, we adopted ASU No. 2016-09, "Improvements to Employee Share-based Payment Accounting" An adjustment of $16.9 million was recorded to the beginning balance of retained earnings based upon the adoption of the new standard.

At December 31, 2017, certain of LP’s foreign subsidiaries had accumulated surplus earnings of approximately $90 million which have been, and are intended to be, indefinitely reinvested in LP’s foreign operations. This amount becomes taxable upon a sale of the subsidiaries and, in certain circumstances, may be taxable upon distribution. Other foreign subsidiaries have experienced accumulated deficits. Determination of the amount of any unrecognized US income tax liability on these temporary differences is not practical because of the complexities of the hypothetical calculations

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,
	2017		2016		2015
U.S. federal tax rate	35	%	35	%	(35	)%
State and local income taxes	2		2		(2	)
Effect of foreign tax rates	(3	)	(5	)	13
Effect of foreign exchange on functional currencies	1		2		(8	)
Tax credits	(1	)	(12	)	—
Capital gain - timber	—		(15	)	—
Stock-based compensation	—		(2	)	—
Domestic manufacturing deduction	(2	)	(2	)	—
Valuation allowance	(6	)	(12	)	31
Uncertain tax positions	1		21		(4	)
Effect of U.S. federal rate change on deferred taxes	(3	)	—		—
Other, net	(1	)	—		2
Effective tax rate (%)	23	%	12	%	(3	)%

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 and Brazil.

U.S. tax years are now closed through 2013, and no audits are currently in progress. We remain subject to U.S. federal examinations of tax years 2014 to 2016 as well as state and local tax examination for the tax years 2007-2016. In 2016, Canada completed its audits of tax years 2012 and 2013; tax years 2014 through 2016 are subject to examination. Quebec provincial audits have been effectively settled through 2015. Chilean returns for the 2010 - 2013 tax years have been audited and various issues are currently being appealed in the Chilean courts and years 2014 through 2016 are subject to examination. Brazilian returns for years 2009 to 2016 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	2017			2016			2015
Beginning balance	$	39.8		$	4.1		$	42.2
Increases:
Tax positions taken in current year	0.6			26.9			—
Tax positions taken in prior years	1.2			10.4			0.9
Decreases:
Tax positions taken in current year	—			—			—
Tax positions taken in prior years	(1.3		)	—			(0.5		)
Settlements during the year	—			—			(34.7		)
Lapse of statute in current year	—			(1.6		)	(3.8		)
Ending balance	$	40.3		$	39.8		$	4.1

Included in the above balances at December 31, 2017 and 2016 is $39.9 million and $39.8 million of tax benefits that, if recognized, would affect our effective tax rate. We accrued interest of $0.7 million and paid interest of $0.0 million during 2017 and accrued interest of $3.0 million and paid interest of $0.0 million during 2016. In total, we have recognized a liability of $3.7 million and $3.0 million for accrued interest related to its uncertain tax positions as of December 31, 2017 and 2016. The 2015 settlement amount in the above table is the result of our agreement with the Internal Revenue Service regarding their examination of tax years 2007-2009.

Non-operating Income (Expense) (Notes)

12 Months Ended

Dec. 31, 2017

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 $13.2 million, $39.1 million and $32.1 million for the years ended December 31, 2017, 2016 and 2015. This income (expense) is comprised of the following components:



	Year ended December 31,
Dollar amounts in millions	2017			2016			2015
Interest expense	$	(20.6	)	$	(32.9	)	$	(32.0	)
Amortization of debt charges	(0.9		)	(1.1		)	(1.1		)
Capitalized interest	2.2			1.9			1.9
Interest expense, net of capitalized interest	(19.3		)	(32.1		)	(31.2		)
Investment income	9.5			8.0			4.9
SERP market adjustments	1.0			0.2			(0.5		)
Investment income	10.5			8.2			4.4
Foreign currency losses	(4.4		)	2.1			(5.3		)
Early debt extinguishment	—			(17.3		)	—
Other non-operating income (expense)	(4.4		)	(15.2		)	(5.3		)
Total non-operating income (expense)	$	(13.2	)	$	(39.1	)	$	(32.1	)

Long-term Debt

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Long-term Debt

LONG-TERM DEBT



	December 31,
Dollar amounts in millions	2017											2016
	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		$	(4.4	)	$	345.6		$	350.0		$	(5.0	)	$	345.0
Bank credit facilities:
Chilean term credit facility, maturing 2019, interest rates fixed	UF+3.9%		7.7			(0.1		)	7.6			7.0			(0.3		)	6.7
Brazilian export financing facility, maturing 2017, interest rates fixed	6.65	%	—			—			—			2.0			—			2.0
Limited recourse notes payable:
Senior notes, payable 2018, interest rates fixed	7.3	%	22.0			—			22.0			22.0			—			22.0
Other financing:
Capital leases			0.7						0.7			1.3						1.3
Total			380.4			(4.5		)	375.9			382.3			(5.3		)	377.0
Less: current portion			(25.1		)				(25.1		)	(2.6		)				(2.6		)
Net long-term portion			$	355.3		$	(4.5	)	$	350.8		$	379.7		$	(5.3	)	$	374.4

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 $0.9 million, $1.1 million and $1.1 million for the years ended December 31, 2017, 2016 and 2015. Included in these amortized amounts are deferred debt costs associated with our current line of credit, which is recorded as an "Other Asset" LP's Consolidated Balance Sheet.

We estimated our limited recourse notes payable to have a fair value of approximately $22.4 million and $23.4 million at December 31, 2017 and 2016. We estimated the Senior Notes due 2024 to have a fair value of $363.9 million and $344.3 million at December 31, 2017 and 2016 based upon market quotations. We believe the carrying amounts of the Chilean term credit facility as well as the Brazil export 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 $22.0 million of notes mature in 2018. The notes are secured by $22.2 million of notes receivable from Green Diamond Resource Company (Green Diamond). Pursuant to the terms of the notes payable, in the event of a default by Green Diamond, we would be liable to pay only 10% of the indebtedness represented by the notes payable.

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, 2017 and 2016, no revolving borrowings had been made or 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%, (b) 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, 2017, 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. We made an optional prepayment of $6.8 million during 2016. The impact of foreign currency exchange rates in 2017 was $0.6 million which included a UF change of $0.1 million.

In August 2011, we entered into an export financing loan agreement with a Brazilian bank. This loan was repaid in 10 equal semi-annual payments that began in January 2013 and ended in July 2017.

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, 2017 and 2016 was approximately 5.1% and 5.1% . Required repayment of principal for long-term debt is as follows:



Dollar amounts in millions
Years ending December 31,
2018	$	25.1
2019	5.3
2020	—
2021	—
2022	—
2023 and after	350.0
Total	$	380.4

Cash paid during 2017, 2016 and 2015 for interest (net of capitalized interest) was $17.5 million, $27.2 million and $36.9 million.

Retirement Plans and Post Retirement Benefits

12 Months Ended

Dec. 31, 2017

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 will retroactively adopt 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 plans, which account for approximately 78% 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 these plans. The remaining defined benefit pension plans in Canada use a variety of benefit formulas.

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 year ended December 31, 2017 and 2015, we recorded a plan settlement charge of $3.1 million and $0.8 million associated with the retirement of our executives during 2017 and 2015.

The components of LP’s net periodic pension costs and the assumptions related to those costs consisted of the following:



	Year ended December 31,
Dollar amounts in millions	2017			2016			2015
Service cost	$	4.9		$	4.3		$	3.8
Interest cost	12.5			13.1			13.1
Expected return on plan assets	(13.1		)	(13.1		)	(15.0		)
Amortization of prior service cost and net transition asset	0.5			0.5			0.5
Amortization of net actuarial loss	6.2			5.4			6.8
Net periodic pension cost	$	11.0		$	10.2		$	9.2
Loss due to settlement	$	3.1		$	—		$	0.8

Discount rate	3.9		%	4.1		%	3.8		%
Weighted rate of compensation increase	0.7		%	0.7		%	0.7		%
Weighted expected return on plan assets	5.4		%	5.4		%	6.0		%

Other changes in plan assets and benefit obligations recognized in other comprehensive income (OCI):



	Year ended December 31,
Dollar amounts in millions	2017			2016			2015
Net actuarial (gain) loss	$	(3.9	)	$	4.8		$	0.8
Amortization of net actuarial loss	(9.3		)	(5.4		)	(7.6		)
Amortization of prior service cost	(0.5		)	(0.5		)	(0.5		)
Foreign exchange rate changes	—			—			(0.1		)
Total recognized in OCI	$	(13.7	)	$	(1.1	)	$	(7.4	)

We calculate the net periodic pension cost for a given fiscal year based upon assumptions developed at the end of the previous fiscal year. As of January 1, 2010, we froze future contribution credits to its qualified U.S. defined benefit pension plans.

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.

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 benefit plan obligation, funded status and the assumptions related to the obligations as of the measurement date for each year presented as of December 31 follow:



	December 31,
Dollar amounts in millions	2017			2016
Change in benefit obligation:
Beginning of year balance	$	331.9		$	330.8
Service cost	4.9			4.3
Interest cost	12.5			13.1
Actuarial loss	10.8			3.5
Foreign exchange rate changes	3.6			1.6
Benefits paid	(18.2		)	(21.4		)
End of year balance	$	345.5		$	331.9
Change in assets (fair value):
Beginning of year balance	$	239.9		$	237.4
Actual return on plan assets	27.8			11.8
Employer contribution	12.7			10.5
Foreign exchange rate changes	3.7			1.6
Benefits paid	(18.2		)	(21.4		)
End of year balance	$	265.9		$	239.9
Funded status	$	(79.6	)	$	(92.0	)
Weighted average assumptions for obligations as of measurement date
Discount rate for obligations	3.4		%	3.9		%
Rate of compensation increase	0.7		%	0.7		%

The amounts recognized in our Consolidated Balance Sheets as of December 31 consist of the following:



Dollar amounts in millions	2017			2016
Noncurrent pension assets, included in “Other assets”	$	1.4		$	0.9
Current pension liabilities, included in “Accounts payable and accrued liabilities”	(12.1		)	(0.2		)
Noncurrent pension liabilities, included in “Other long-term liabilities”	(68.9		)	(92.7		)
Total	$	(79.6	)	$	(92.0	)
Amounts recognized in other comprehensive income—pre-tax
Net actuarial loss	$	128.0		$	140.6
Prior service cost	8.0			8.4
Total	$	136.0		$	149.0

The total accumulated benefit obligation for all pension plans as of December 31, 2017 and 2016 was $343.2 million and $326.8 million.

The accumulated benefit obligation and fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets were $287.9 million and $207.7 million at December 31, 2017 and $284.0 million and $194.2 million at December 31, 2016. The projected benefit obligations and fair value of plan assets of plans with projected benefit obligations in excess of plan assets were $288.7 million and $207.7 million at December 31, 2017 and $287.1 million and $194.2 million at December 31, 2016.

The amounts of accumulated other comprehensive income that is expected to be amortized as expense during 2018 is:



Dollar amounts in millions
Net actuarial loss	$	6.1
Prior service cost	0.5
Total	$	6.6

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



Dollar amounts in millions
Year
2018	31.4
2019	19.7
2020	20.9
2021	20.6
2022	25.5
2023– 2027	100.0

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

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 2017		Actual Allocation
	Target Allocation 2017		2017		2016
Asset category
US Plans
Equity securities	40	%	40	%	40	%
Debt securities	20	%	20	%	20	%
Multi-Strategy Funds	40	%	40	%	40	%
Total Allocation for US Plans	100	%	100	%	100	%

Non-US Plans
Equity securities	27	%	28	%	29	%
Debt securities	71	%	70	%	70	%
Other, including cash and cash equivalents	2	%	2	%	1	%
Total Allocation for Non-US 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, 2017 and December 31, 2016, 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, 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.



Dollar amounts in millions Asset Category	December 31, 2016		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	$	51.3	$	38.0	$	13.3	$	—
International stock funds	38.5		13.5		25.0		—
Fixed income investment funds:^(b)
Domestic bond funds	36.8		36.8		—		—
International bond funds	36.0		—		36.0		—
Multi-strategy funds^(c)	75.1		62.9		—		12.2
Cash & cash equivalents	2.2		—		2.2		—
Total	$	239.9	$	151.2	$	76.5	$	12.2

_______________


^(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, 2016	$	13.3
Total unrealized gains	0.3
Contribution (redemption)	(1.5		)
Management fees	0.1
Balance at December 31, 2016	$	12.2
Total unrealized gains	$	0.7
Contribution (redemption)	0.1
Management fees	(0.1		)
Balance at December 31, 2017	$	12.9

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 1.4 million shares of LP common stock that represented approximately 8.5% of the total market value of plan assets at December 31, 2017.

In Canada, we sponsor both defined contribution plans and Registered Retirement Savings Plans for hourly and salaried employees that allow for pre-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 2017, 2016 and 2015 were $9.7 million, $8.7 million and $8.0 million.

Other Benefit Plans

We have several plans that provide postretirement benefits other than pensions, primarily for salaried employees in the U.S. and certain groups of Canadian employees. The funded status at December 31, 2017 and 2016 was $9.0 million and $7.8 million. Net expense related to these plans was not significant in 2017 or 2016.

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 $1.9 million and $1.8 million at December 31, 2017 and December 31, 2016 and is included in “Other long-term liabilities” on LP’s Consolidated Balance Sheets.

Stock-Based Compensation

12 Months Ended

Dec. 31, 2017

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, 2017, no shares of preferred stock have been issued; however, 2,000,000 shares of Series A Junior Participating Preferred Stock have been reserved for issuance in connection with the Company’s Shareholder Rights Plan. Additional series of preferred stock may be designated and the related rights and preferences fixed by action of the Board of Directors.

Shareholder Rights Plan

In May 2008, the Board of Directors approved a shareholder rights plan and declared a dividend of one preferred share purchase right for each outstanding share of common stock. Each right represents the right to purchase one-hundredth of a share of Preferred Stock, at an exercise price of $100, subject to adjustment. The rights are only exercisable ten days after a person or group acquires, or commences a tender or exchange offer to acquire, beneficial ownership of 15% or more of the Company’s outstanding common stock.

Subject to the terms of the shareholder rights plan and the discretion of the Board of Directors, each right would entitle the holder to purchase a number of additional shares of common stock of LP having a total market value of twice the exercise price of each right. The rights expire in June 2018, but can be redeemed by action of the Board of Directors prior to that time at $0.01 per right.

Common Stock Plan

We have a stock-based compensation plan under which stock options, SSARs, incentive shares, restricted stock and performance shares awards are granted. At December 31, 2017, 2.9 million shares were available under the current plan for these awards.



	Year ended December 31,
Dollar amounts in millions	2017		2016		2015
Total stock-based compensation expense (costs of sales and selling and administrative)	$	9.7	$	13.0	$	9.3
Income tax benefit related to stock-based compensation	$	0.8	$	3.4	$	—
Impact on cash flow due to taxes paid related to net share settlement of equity awards	$	5.9	$	9.2	$	6.1

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.

Stock-Settled Stock Appreciation Rights

We grant 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			2015
Expected stock price volatility	41		%	45		%	54		%
Expected dividend yield	—		%	—		%	—		%
Risk-free interest rate	2.1		%	1.4		%	1.5		%
Expected life of options (in years)	6.0 years			6 years			6 years
Weighted average fair value of options and SSARs granted	$	8.02		$	6.99		$	8.80

Expected Stock Price Volatility: 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: 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 SSARs: 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.

Estimated Pre-vesting Forfeitures: When estimating forfeitures, we consider voluntary termination behavior as well as workforce reduction programs.

The following table summarizes stock options and SSARs outstanding as of December 31, 2017 as well as activity during the last year.



	Options/ SSARs		Weighted Average Exercise Price		Weighted Average Contractual Term (in years)	Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2016	4,229,247		$	15.84
Granted	285,934		$	19.14
Exercised	(1,093,553	)	$	12.79
Expired	(993,752	)	$	22.94
Forfeited	(23,068	)	$	16.54
Outstanding at December 31, 2017	2,404,808		$	14.76	5.8	$	27.7
Vested and expected to vest at December 31, 2017⁽¹⁾	2,284,568		$	14.76	5.8	$	27.5
Exercisable at December 31, 2017	1,703,031		$	13.70	4.8	$	21.4

_______________


⁽¹⁾	Expected to vest based upon historical forfeiture rate

The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value (the difference between our closing stock price on the last trading day of 2017 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, 2017. This amount changes based on the market value of our stock as reported by the New York Stock Exchange.

As of December 31, 2017, there was $2.0 million of total unrecognized compensation costs related to stock options and SSARs. These costs are expected to be recognized over a weighted-average period of 1.5 years. We recognized $2.5 million, $4.6 million and $3.6 million in compensation expense associated with these awards for the years ended December 31, 2017, 2016 and 2015. The intrinsic value of SSARs exercised in the years ended December 31, 2017, 2016 and 2015 was $26.5 million, $29.8 million and $23.9 million

Restricted Share Units

We grant restricted share units to certain key employees and directors. The awards entitle the participant to receive unrestricted shares of LP common stock at no cost to the participant. Awards granted under this plan to employees generally vest three years from the date of grant and to directors over one year. The market value of these grants approximates the fair value. The fair value of the restricted awards on the date of the grant is amortized ratably over the service period which is generally three years. We recorded compensation expense related to these awards in 2017, 2016 and 2015 of $3.9 million, $4.7 million and $3.5 million. As of December 31, 2017, there was $4.1 million of total unrecognized compensation cost related to unvested restricted awards.

The following table summarizes restricted awards outstanding as of December 31, 2017 as well as activity during the past year.



	Shares		Weighted Average Grant Date Fair Value		Weighted Average Contractual Term (in years)	Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2016	676,267		$	16.64
Granted	249,011		$	20.11
Vested	(207,306	)	$	17.17
Forfeited	(54,802	)	$	16.92
Outstanding at December 31, 2017	663,170		$	17.75	1.2	$	17.4

The total fair value of awards vested during the years ended December 31, 2017, 2016 and 2015, was $4.5 million, $2.4 million and $5.4 million.

Restricted Shares

We grant restricted stock to certain senior executive employees. The shares vest three years from the date of grant. During the vesting period, the participants have voting rights and receive dividends, but the shares may not be sold, assigned, transferred, pledged or otherwise encumbered. Additionally, granted but unvested shares are forfeited upon termination of employment. The fair value of the restricted shares on the date of the grant is amortized ratably over the service period which is generally three years. We recorded compensation expense related to these awards in 2017, 2016 and 2015 of $1.5 million, $2.4 million and $1.7 million. As of December 31, 2017, there was $2.2 million of total unrecognized compensation cost related to unvested restricted stock to be recognized over 1.3 years.

The following table summarizes restricted awards outstanding as of December 31, 2017 as well as activity during the past year.



	Shares		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2016	345,537		$	16.73
Granted	109,386		$	19.80
Vested	(115,352	)	$	17.92
Forfeited	(28,356	)	$	17.10
Outstanding at December 31, 2017	311,215		$	17.33

The total fair value of awards vested during the years ended December 31, 2017, 2016 and 2015, was $2.2 million, $1.4 million and $3.8 million.

Performance Share Awards

We grant performance shares awards to certain senior key employees. The right to earn shares under these awards is based on the achievement of various segment or company-wide performance conditions, including revenue growth of certain product segments or individual products as compared to housing start growth. The achievement of the performance goals is ratable from 0% to 200%. Compensation cost is amortized into expense over the service period, which is generally three years, and is based on the probability of meeting performance targets. We recorded compensation expense related to these awards in 2017 and 2016 of $1.6 million and $1.0 million. As of December 31, 2017, there was $1.8 million of total unrecognized compensation cost related to these performance shares to be recognized over 1.6 years.

The following table summarizes information about performance share awards as of December 31, 2017, as well as activity during the year then ended, based on the target award amounts in the performance share award agreements:



	Shares		Weighted Average Grant Date Fair Value
Outstanding at December 31, 2016	85,361		$	20.45
Granted	121,724		24.87
Vested	—		—
Forfeited	(19,011	)	22.71
Outstanding at December 31, 2017	188,074		$	23.08

Asset Retirement Obligation

12 Months Ended

Dec. 31, 2017

ASSET RETIREMENT OBLIGATIONS [Abstract]

Asset Retirement Obligation Disclosure [Text Block]

ASSET RETIREMENT OBLIGATIONS

The activity in our asset retirement obligation liability for 2017 and 2016 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	2017			2016
Beginning balance	$	10.2		$	10.0
Accretion expense	0.8			0.8
Adjusted to expense during the year	—			(0.3		)
Payments made	(0.3		)	(0.4		)
Translation	0.1			0.1
Ending balance	$	10.8		$	10.2

Other Operating Credits and Charges, Net

12 Months Ended

Dec. 31, 2017

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	2017			2016			2015
Contingent consideration fair value adjustment	—			—			0.2
Adjustments to retirement accounts	(3.1		)	—			(0.8		)
Refund of sales and use taxes	0.8			—			—
Loss related to intangible forest license	—			—			(11.6		)
Loss due to marketing settlement	—			—			(1.0		)
Loss on workers compensation reserve	(0.9		)	—			—
Adjustment to product related warranty reserves	(5.4		)	(16.9		)	1.4
Additions to environmental related contingency reserves and asset retirement obligations	—			—			(4.6		)
Other	0.6			(0.5		)	0.1
	$	(8.0	)	$	(17.4	)	$	(16.3	)
Other operating charges and credits associated with unconsolidated affiliates:
Valuation allowance associated with deferred taxes	—			—			0.7
	$	—		$	—		$	0.7

2017

During 2017, we recorded a $8.0 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;


•	a loss of $3.1 million associated with a pension curtailment charge related to the prior CEO's retirement; 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.

2015

During 2015, we recorded a $16.3 million loss in "Other operating credits and charges, net". The components of the net charges include:


•	a gain of $0.2 million related to fair market value adjustments to the contingent consideration payable in connection with a business combination (see Note 4 for additional discussions on fair value measurements);


•	a loss of $0.8 million related to a pension settlement (see Note 14 for additional discussion);


•	a write-off of $11.6 million related to the cancellation of an intangible forest license by the Ministry of Forestry in Quebec associated with an indefinitely curtailed OSB mill;


•	a loss of $1.0 million due to a marketing settlement with a customer;


•	a gain of $1.4 million related to an decrease in product related warranty reserves associated with SmartSide siding products due to reduced claims activity; and


•	a loss of $4.6 million related to an increase in environmental reserves and related asset retirement obligations associated with a site where we previously operated a vinyl siding manufacturing facility.

Additionally, other operating charges and credits reflected in Equity in (income) loss from unconsolidated affiliates includes a gain of $0.7 million associated with a reduction of a valuation allowance on the joint venture's books associated with deferred tax assets.

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

12 Months Ended

Dec. 31, 2017

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	2017			2016			2015
Impairment charges on long-lived assets	$	(9.1	)	$	(0.8	)	$	(1.5	)
Gain (loss) on sale or other disposition of other long-lived assets	2.3			9.2			(0.6		)
	$	(6.8	)	$	8.4		$	(2.1	)

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; and


•	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.

2015

During 2015, we recorded a net loss on sale of long-lived assets of $2.1 million. This net gain includes the following items:


•	a loss of $1.2 million related to the impairment on certain manufacturing assets associated with various OSB mills;


•	a loss of $0.3 million related to the write-off of certain logging roads associated to the Chambord timber license (see Note 17 for further discussion); and


•	a loss of $0.6 million related to the disposal of various assets no longer used.

Contingencies

12 Months Ended

Dec. 31, 2017

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	2017			2016
Environmental reserves	$	15.0		$	15.9
Other reserves	0.1			0.2
Total contingencies	15.1			16.1
Current portion	(3.4		)	(3.4		)
Long-term portion	$	11.7		$	12.7

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 $2.1 million of costs, relating 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 one site 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	2017			2016			2015
Beginning balance	$	15.9		$	16.6		$	13.6
Adjusted to expense (income) during the year	1.2			0.7			0.5
Adjusted to expense (income) through other operating credits and charges, net	—			—			3.2
Payments made	(2.1		)	(1.4		)	(0.7		)
Ending balance	$	15.0		$	15.9		$	16.6

During 2017, 2016 and 2015, we adjusted our reserves at a number of sites to reflect current estimates of remediation costs and environmental settlements. During 2015, $3.2 million was adjusted through other operating credits and charges related to an increase in environmental reserves for a site that we previously operated a vinyl siding operation based upon a revised estimate of the environmental remediation required.

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, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments Disclosure [Text Block]

COMMITMENTS AND CONTINGENT LIABILITIES

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.

The Company and its subsidiaries 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, 2017, future minimum annual rent commitments are as follows:



Dollar amounts in millions
Year ended December 31,
2018	$	2.7
2019	2.7
2020	1.9
2021	1.9
2022	1.0
2023 and thereafter	—
Total	$	10.2

Rental expense for operating leases amounted to $12.5 million, $11.0 million and $10.5 million in 2017, 2016 and 2015.

Product Warranty

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Guarantees and Indemnifications

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 divestures 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.

Additionally, 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	2017			2016			2015
Beginning balance	$	24.1		$	21.0		$	31.4
Accrued to expense during the year	1.0			0.8			0.7
Accrued/ (credited) to other operating credits and charges	5.4			16.9			(1.4		)
Accrued to discontinued operations	1.5			0.5			2.5
Foreign currency translation	2.2			(0.2		)	(0.5		)
Payments made	(9.5		)	(14.9		)	(11.7		)
Total warranty reserves	24.7			24.1			21.0
Current portion of warranty reserves	(9.0		)	(9.0		)	(6.0		)
Long term portion of warranty reserves	$	15.7		$	15.1		$	15.0

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 increased the warranty reserves related to CanExel products sold in certain geographic areas and for a specific time period by $5.4 million in 2017 and $16.9 million in 2016. The changes to the reserve reflected revised estimates of future claims.

During 2015, we decreased the warranty reserve associated with our SmartSide products by $1.4 million based upon reduced claims activity.

We increased the warranty reserves related to discontinued composite decking products by $1.5 million, $0.5 million, and $2.5 million for the years ended December 31, 2017, 2016 and 2015. The additional reserves reflect revised estimates of future claim payments based upon an increase in decking warranty claims related to a specific operation and specific time period.

We believe that the warranty reserve balances at December 31, 2017 are adequate to cover future warranty payments. However, it is possible that additional charges may be required.

Discontinued Operations

12 Months Ended

Dec. 31, 2017

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

DISCONTINUED OPERATIONS

Over the last several years, we have adopted and implemented plans to sell 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	2017			2016			2015
Operating loss	$	(2.0	)	$	(0.8	)	$	(3.2	)
Cash provided by (used in) operations from discontinued operations	(1.8		)	(2.6		)	(4.3		)

Included in the operating losses of discontinued operations for the years ended December 31, 2017, 2016 and 2015 is an increase in warranty reserves of $1.5 million, $0.5 million and $2.5 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, 2017, 2016 and 2015 is $1.3 million, $2.3 million and $3.6 million of cash settlements of warranty obligations associated with discontinued operations.

Accumulated Comprehensive Loss

12 Months Ended

Dec. 31, 2017

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, 2017, 2016 and 2015.



				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, 2015	$	(33.7	)	$	(93.1	)	$	(5.9	)	$	2.6		$	(1.2	)	$	(131.3	)
Other comprehensive income (loss) before reclassifications	(21.4		)	9.5			0.7			1.4			0.2			(9.6		)
Income taxes	—			—			—			(0.7		)	—			(0.7		)
Net other comprehensive income (loss) before reclassifications	(21.4		)	9.5			0.7			0.7			0.2			(10.3		)
Amounts reclassified from accumulated comprehensive income (loss)	—			(6.8		)	(0.5		)	—			—			(7.3		)
Income taxes				2.6			0.2			—			—			2.8
Net amounts reclassified from cumulative other comprehensive income (loss)	—			(4.2		)	(0.3		)	—			—			(4.5		)
Total other comprehensive income (loss)	(21.4		)	5.3			0.4			0.7			0.2			(14.8		)
Balance at December 31, 2015	(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	)

(a) These accumulated other comprehensive income components are included in the computation of net periodic pension cost, see Note 14 for additional details. The net periodic pension cost is included in Cost of sales and Selling and administrative line items 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 $4.5 million and $0.3 million in 2017 and 2016 and a benefit of $3.9 million in 2015. The unrealized gain (loss) on investments included a tax provision of $0.5 million and $0.7 million in 2017 and 2015 and a benefit of $0.4 million in 2016.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2017

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]

Nature of Operations [Policy Text Block]

Nature of Operations

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

Consolidation, Policy [Policy Text Block]

Consolidation

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

Fair Value of Financial Instruments, Policy [Policy Text Block]

Fair Value of Financial Instruments

Inventory, Policy [Policy Text Block]

Inventory



	December 31,
Dollar amounts in millions	2017		2016
Logs	$	60.3	$	54.6
Other raw materials	20.8		23.0
Semi finished inventory	24.3		16.8
Finished products	153.7		140.2
Total	$	259.1	$	234.6

Property, Plant and Equipment, Policy [Policy Text Block]

Property, Plant and Equipment



Dollar amounts in millions	Years ended December 31,
Dollar amounts in millions	2017		2016		2015
Cost of sales	$	120.1	$	109.6	$	98.9
Selling and administrative	3.2		3.2		3.0
Total depreciation and amortization	$	123.3	$	112.8	$	101.9

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.

Asset Impairment, Policy [Policy Text Block]

Potential Impairments

Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]

Goodwill and Intangible assets

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

See Note 11 for further discussion of deferred income taxes.

Asset Retirement Obligation [Policy Text Block]

Asset Retirement Obligations

Stock-based Compensation Policy [Policy Text Block]

Stock-Based Compensation

Foreign Currency Transactions and Translations Policy [Policy Text Block]

Foreign Currency Translation

Revenue Recognition, Policy [Policy Text Block]

Revenue Recognition

Advertising Costs, Policy [Policy Text Block]

Advertising costs

Other operating charges and credits policy [Policy Text Block]

Other Operating Credits and Charges, Net

Retirement Benefits Policy [Policy Text Block]

Retirement Benefits

Comprehensive Income, Policy [Policy Text Block]

Comprehensive Income

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventory



	December 31,
Dollar amounts in millions	2017		2016
Logs	$	60.3	$	54.6
Other raw materials	20.8		23.0
Semi finished inventory	24.3		16.8
Finished products	153.7		140.2
Total	$	259.1	$	234.6

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	2017		2016		2015
Cost of sales	$	120.1	$	109.6	$	98.9
Selling and administrative	3.2		3.2		3.0
Total depreciation and amortization	$	123.3	$	112.8	$	101.9

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	2017			2016
Property, plant and equipment, at cost:
Land, land improvements and logging roads, net of road amortization	$	162.7		$	154.4
Buildings	347.5			331.2
Machinery and equipment	1,977.4			1,934.1
Construction in progress	98.5			48.7
	2,586.1			2,468.4
Accumulated depreciation	(1,660.0		)	(1,577.0		)
Property, plant and equipment, net	$	926.1		$	891.4

Investments (Tables)

12 Months Ended

Dec. 31, 2017

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, 2017 and December 31, 2016:



Dollar amounts in millions	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
December 31, 2017	$	0.4	$	5.6	$	—	$	6.0

December 31, 2016	$	0.4	$	4.4	$	—	$	4.8

Investments Classified by Contractual Maturity Date [Table Text Block]

debt securities classified as available for sale at December 31, 2017 exceed one year.

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

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, 2017 and 2016 is summarized in the following tables.



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		—		—



Dollar amounts in millions	December 31, 2016		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	$	4.8	$	—	$	—	$	4.8
Trading securities	2.6		2.6		—		—

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, 2015	$	5.8
Total realized/unrealized gains (losses) included in other comprehensive income	(1.0		)
Balance at December 31, 2016	$	4.8
Total realized/unrealized gains (losses) included in other comprehensive income	1.2
Balance at December 31, 2017	$	6.0

Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

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	2017	2016	2015
Denominator for basic earnings per share:
Weighted average common shares outstanding	144.4	143.4	142.4
Effect of dilutive securities:
Dilutive effect of employee stock plans	2.0	1.7	—
Dilutive effect of stock warrants	—	0.2	—
Dilutive potential common shares	2.0	1.9	—
Denominator for diluted earnings per share:
Adjusted weighted average shares	146.4	145.3	142.4

Receivables (Tables)

12 Months Ended

Dec. 31, 2017

Receivables [Abstract]

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

Receivables consist of the following:



	December 31,
Dollar amounts in millions	2017			2016
Trade receivables	$	124.6		$	96.1
Income tax receivable	2.2			1.7
Other receivables	16.6			11.5
Allowance for doubtful accounts	(0.9		)	(1.0		)
	$	142.5		$	108.3

Notes Receivable from Asset Sales (Tables)

12 Months Ended

Dec. 31, 2017

Notes Receivable from Asset Sales [Abstract]

Notes receivable from asset sales [Table Text Block]



Dollar amounts in millions	Interest Rate 2017		December 31,
Dollar amounts in millions	Interest Rate 2017		2017		2016
Notes receivable (secured), maturing 2018, interest rates fixed	7.3	%	$	22.2	$	22.2
Total			22.2		22.2
Current portion			22.2		—
Long-term portion			$	—	$	22.2

Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Other Intangible Assets [Abstract]

Schedule of Goodwill [Table Text Block]

Changes in goodwill and other intangible assets for the year ended December 31, 2017 and 2016 are provided in the following table:



Dollar amounts in millions	2017											2016
	Timber and timberlands			Goodwill		Developed Technology			Total			Timber and timberlands			Goodwill		Total
Beginning balance December 31,	$	47.1		$	9.7	$	—		$	56.8		$	50.4		$	9.7	$	60.1
Additions	—			6.4		11.0			$	17.4		—					—
Amortization	(3.2		)	—		(0.4		)	(3.6		)	(3.3		)	—		(3.3		)
Total goodwill and other intangibles	$	43.9		$	16.1	$	10.6		$	70.6		$	47.1		$	9.7	$	56.8

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,
2018	$	3.8
2019	3.8
2020	3.8
2021	3.8
2022	3.8

Accounts Payable and Accrued Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

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	2017		2016
Accounts payable	$	112.3	$	89.9
Salaries and wages payable	75.8		58.7
Taxes other than income taxes	3.0		3.6
Current portion of warranty reserves	9.0		9.0
Accrued interest	6.0		5.4
Accrued rebates	24.2		19.3
Other accrued liabilities	6.8		5.6
Total Accounts payable and accrued liabilities	$	237.1	$	191.5

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Operating Loss Carryforwards [Line Items]

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, 2017 consists of:



Dollar amounts in millions	Expiration Beginning in	Benefit Amount		Valuation Allowance
State NOL carryovers	2018	14.1		(1.4		)
State credit carryovers	2018	0.7		(0.1		)
Canadian NOL carryovers	2034	16.7		—
Canadian capital loss carryovers	Indefinitely	6.2		(6.2		)
Canadian credit carryovers	2018	2.7		—
Chilean NOL carryovers	Indefinitely	2.0		(2.0		)
		$	42.4	$	(9.7	)

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

oss) from continuing operations before income taxes consists of the following:



	Year ended December 31,
Dollar amounts in millions	2017		2016		2015
Domestic	$	341.8	$	98.4	$	(8.7	)
Foreign	168.4		71.7		(80.0		)
Total	$	510.2	$	170.1	$	(88.7	)

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



	Year ended December 31,
Dollar amounts in millions	2017			2016			2015
Current tax provision (benefit):
U.S. federal	$	105.8		$	60.4		$	(2.4	)
State and local	4.4			4.4			(0.5		)
Foreign	7.9			10.4			2.6
Net current tax provision (benefit)	118.1			75.2			(0.3		)
Deferred tax provision (benefit):
U.S. federal	(19.3		)	(48.1		)	(1.1		)
State and local	8.0			1.2			(1.8		)
Foreign	38.2			11.7			(26.6		)
Net valuation allowance increase (decrease)	(25.9		)	(20.2		)	27.1
Net deferred tax benefit	1.0			(55.4		)	(2.4		)
Total income tax provision (benefit)	$	119.1		$	19.8		$	(2.7	)

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

The tax effects of significant temporary differences creating deferred tax (assets) and liabilities at December 31 were as follows:



	December 31,
Dollar amounts in millions	2017			2016
Accrued liabilities	53.4			83.9
Benefit of capital loss and NOL carryovers	38.9			83.4
Other	10.2			11.6
Inventories	6.6			6.9
Market value write down of ARS	4.9			8.8
Benefit of tax credit carryovers	3.5			3.7
Valuation allowance	(13.6		)	(37.9		)
Total deferred tax assets	103.9			160.4
Property, plant and equipment	(118.2		)	(164.2		)
Timber and timberlands	(11.4		)	(11.6		)
Installment sale gain deferral	(5.2		)	(8.0		)
Total deferred tax liabilities	(134.8		)	(183.8		)
Net deferred tax liabilities	$	(30.9	)	$	(23.4	)
Balance sheet classification
Long-term deferred tax asset	2.5			4.3
Long-term deferred tax liability	(33.4		)	(27.7		)
	$	(30.9	)	$	(23.4	)

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,
	2017		2016		2015
U.S. federal tax rate	35	%	35	%	(35	)%
State and local income taxes	2		2		(2	)
Effect of foreign tax rates	(3	)	(5	)	13
Effect of foreign exchange on functional currencies	1		2		(8	)
Tax credits	(1	)	(12	)	—
Capital gain - timber	—		(15	)	—
Stock-based compensation	—		(2	)	—
Domestic manufacturing deduction	(2	)	(2	)	—
Valuation allowance	(6	)	(12	)	31
Uncertain tax positions	1		21		(4	)
Effect of U.S. federal rate change on deferred taxes	(3	)	—		—
Other, net	(1	)	—		2
Effective tax rate (%)	23	%	12	%	(3	)%

Summary of Income Tax Contingencies [Table Text Block]



	December 31,
Dollar amounts in millions	2017			2016			2015
Beginning balance	$	39.8		$	4.1		$	42.2
Increases:
Tax positions taken in current year	0.6			26.9			—
Tax positions taken in prior years	1.2			10.4			0.9
Decreases:
Tax positions taken in current year	—			—			—
Tax positions taken in prior years	(1.3		)	—			(0.5		)
Settlements during the year	—			—			(34.7		)
Lapse of statute in current year	—			(1.6		)	(3.8		)
Ending balance	$	40.3		$	39.8		$	4.1

Income Taxes Income Act (Tables)

12 Months Ended

Dec. 31, 2017

Jobs Act [Abstract]

Income Tax Disclosure [Text Block]

INCOME TAXES

Tax Cuts and Jobs Act

Income Tax Provision

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



	Year ended December 31,
Dollar amounts in millions	2017		2016		2015
Domestic	$	341.8	$	98.4	$	(8.7	)
Foreign	168.4		71.7		(80.0		)
Total	$	510.2	$	170.1	$	(88.7	)

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



	Year ended December 31,
Dollar amounts in millions	2017			2016			2015
Current tax provision (benefit):
U.S. federal	$	105.8		$	60.4		$	(2.4	)
State and local	4.4			4.4			(0.5		)
Foreign	7.9			10.4			2.6
Net current tax provision (benefit)	118.1			75.2			(0.3		)
Deferred tax provision (benefit):
U.S. federal	(19.3		)	(48.1		)	(1.1		)
State and local	8.0			1.2			(1.8		)
Foreign	38.2			11.7			(26.6		)
Net valuation allowance increase (decrease)	(25.9		)	(20.2		)	27.1
Net deferred tax benefit	1.0			(55.4		)	(2.4		)
Total income tax provision (benefit)	$	119.1		$	19.8		$	(2.7	)

Deferred Taxes

The tax effects of significant temporary differences creating deferred tax (assets) and liabilities at December 31 were as follows:



	December 31,
Dollar amounts in millions	2017			2016
Accrued liabilities	53.4			83.9
Benefit of capital loss and NOL carryovers	38.9			83.4
Other	10.2			11.6
Inventories	6.6			6.9
Market value write down of ARS	4.9			8.8
Benefit of tax credit carryovers	3.5			3.7
Valuation allowance	(13.6		)	(37.9		)
Total deferred tax assets	103.9			160.4
Property, plant and equipment	(118.2		)	(164.2		)
Timber and timberlands	(11.4		)	(11.6		)
Installment sale gain deferral	(5.2		)	(8.0		)
Total deferred tax liabilities	(134.8		)	(183.8		)
Net deferred tax liabilities	$	(30.9	)	$	(23.4	)
Balance sheet classification
Long-term deferred tax asset	2.5			4.3
Long-term deferred tax liability	(33.4		)	(27.7		)
	$	(30.9	)	$	(23.4	)

The benefit relating to capital loss, net operating loss (NOL) and credit carryovers included in the above table at December 31, 2017 consists of:



Dollar amounts in millions	Expiration Beginning in	Benefit Amount		Valuation Allowance
State NOL carryovers	2018	14.1		(1.4		)
State credit carryovers	2018	0.7		(0.1		)
Canadian NOL carryovers	2034	16.7		—
Canadian capital loss carryovers	Indefinitely	6.2		(6.2		)
Canadian credit carryovers	2018	2.7		—
Chilean NOL carryovers	Indefinitely	2.0		(2.0		)
		$	42.4	$	(9.7	)

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,
	2017		2016		2015
U.S. federal tax rate	35	%	35	%	(35	)%
State and local income taxes	2		2		(2	)
Effect of foreign tax rates	(3	)	(5	)	13
Effect of foreign exchange on functional currencies	1		2		(8	)
Tax credits	(1	)	(12	)	—
Capital gain - timber	—		(15	)	—
Stock-based compensation	—		(2	)	—
Domestic manufacturing deduction	(2	)	(2	)	—
Valuation allowance	(6	)	(12	)	31
Uncertain tax positions	1		21		(4	)
Effect of U.S. federal rate change on deferred taxes	(3	)	—		—
Other, net	(1	)	—		2
Effective tax rate (%)	23	%	12	%	(3	)%

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 and Brazil.

Uncertain Tax Positions



	December 31,
Dollar amounts in millions	2017			2016			2015
Beginning balance	$	39.8		$	4.1		$	42.2
Increases:
Tax positions taken in current year	0.6			26.9			—
Tax positions taken in prior years	1.2			10.4			0.9
Decreases:
Tax positions taken in current year	—			—			—
Tax positions taken in prior years	(1.3		)	—			(0.5		)
Settlements during the year	—			—			(34.7		)
Lapse of statute in current year	—			(1.6		)	(3.8		)
Ending balance	$	40.3		$	39.8		$	4.1

Non-operating Income (Expense) (Tables)

12 Months Ended

Dec. 31, 2017

Nonoperating Income (Expense) [Abstract]

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



	Year ended December 31,
Dollar amounts in millions	2017			2016			2015
Interest expense	$	(20.6	)	$	(32.9	)	$	(32.0	)
Amortization of debt charges	(0.9		)	(1.1		)	(1.1		)
Capitalized interest	2.2			1.9			1.9
Interest expense, net of capitalized interest	(19.3		)	(32.1		)	(31.2		)
Investment income	9.5			8.0			4.9
SERP market adjustments	1.0			0.2			(0.5		)
Investment income	10.5			8.2			4.4
Foreign currency losses	(4.4		)	2.1			(5.3		)
Early debt extinguishment	—			(17.3		)	—
Other non-operating income (expense)	(4.4		)	(15.2		)	(5.3		)
Total non-operating income (expense)	$	(13.2	)	$	(39.1	)	$	(32.1	)

Long-term Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

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



	December 31,
Dollar amounts in millions	2017											2016
	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		$	(4.4	)	$	345.6		$	350.0		$	(5.0	)	$	345.0
Bank credit facilities:
Chilean term credit facility, maturing 2019, interest rates fixed	UF+3.9%		7.7			(0.1		)	7.6			7.0			(0.3		)	6.7
Brazilian export financing facility, maturing 2017, interest rates fixed	6.65	%	—			—			—			2.0			—			2.0
Limited recourse notes payable:
Senior notes, payable 2018, interest rates fixed	7.3	%	22.0			—			22.0			22.0			—			22.0
Other financing:
Capital leases			0.7						0.7			1.3						1.3
Total			380.4			(4.5		)	375.9			382.3			(5.3		)	377.0
Less: current portion			(25.1		)				(25.1		)	(2.6		)				(2.6		)
Net long-term portion			$	355.3		$	(4.5	)	$	350.8		$	379.7		$	(5.3	)	$	374.4

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

The weighted average interest rate for all long-term debt at December 31, 2017 and 2016 was approximately 5.1% and 5.1% . Required repayment of principal for long-term debt is as follows:



Dollar amounts in millions
Years ending December 31,
2018	$	25.1
2019	5.3
2020	—
2021	—
2022	—
2023 and after	350.0
Total	$	380.4

- 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

Retirement Plans and Post Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2017

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs and Assumptions Used in Calculating Net Periodic Benefit Cost [Table Text Block]

The components of LP’s net periodic pension costs and the assumptions related to those costs consisted of the following:



	Year ended December 31,
Dollar amounts in millions	2017			2016			2015
Service cost	$	4.9		$	4.3		$	3.8
Interest cost	12.5			13.1			13.1
Expected return on plan assets	(13.1		)	(13.1		)	(15.0		)
Amortization of prior service cost and net transition asset	0.5			0.5			0.5
Amortization of net actuarial loss	6.2			5.4			6.8
Net periodic pension cost	$	11.0		$	10.2		$	9.2
Loss due to settlement	$	3.1		$	—		$	0.8

Discount rate	3.9		%	4.1		%	3.8		%
Weighted rate of compensation increase	0.7		%	0.7		%	0.7		%
Weighted expected return on plan assets	5.4		%	5.4		%	6.0		%

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

Other changes in plan assets and benefit obligations recognized in other comprehensive income (OCI):



	Year ended December 31,
Dollar amounts in millions	2017			2016			2015
Net actuarial (gain) loss	$	(3.9	)	$	4.8		$	0.8
Amortization of net actuarial loss	(9.3		)	(5.4		)	(7.6		)
Amortization of prior service cost	(0.5		)	(0.5		)	(0.5		)
Foreign exchange rate changes	—			—			(0.1		)
Total recognized in OCI	$	(13.7	)	$	(1.1	)	$	(7.4	)

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



	December 31,
Dollar amounts in millions	2017			2016
Change in benefit obligation:
Beginning of year balance	$	331.9		$	330.8
Service cost	4.9			4.3
Interest cost	12.5			13.1
Actuarial loss	10.8			3.5
Foreign exchange rate changes	3.6			1.6
Benefits paid	(18.2		)	(21.4		)
End of year balance	$	345.5		$	331.9
Change in assets (fair value):
Beginning of year balance	$	239.9		$	237.4
Actual return on plan assets	27.8			11.8
Employer contribution	12.7			10.5
Foreign exchange rate changes	3.7			1.6
Benefits paid	(18.2		)	(21.4		)
End of year balance	$	265.9		$	239.9
Funded status	$	(79.6	)	$	(92.0	)
Weighted average assumptions for obligations as of measurement date
Discount rate for obligations	3.4		%	3.9		%
Rate of compensation increase	0.7		%	0.7		%

Schedule of Amounts Recognized in Balance Sheet [Table Text Block]

The amounts recognized in our Consolidated Balance Sheets as of December 31 consist of the following:



Dollar amounts in millions	2017			2016
Noncurrent pension assets, included in “Other assets”	$	1.4		$	0.9
Current pension liabilities, included in “Accounts payable and accrued liabilities”	(12.1		)	(0.2		)
Noncurrent pension liabilities, included in “Other long-term liabilities”	(68.9		)	(92.7		)
Total	$	(79.6	)	$	(92.0	)
Amounts recognized in other comprehensive income—pre-tax
Net actuarial loss	$	128.0		$	140.6
Prior service cost	8.0			8.4
Total	$	136.0		$	149.0

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

The amounts of accumulated other comprehensive income that is expected to be amortized as expense during 2018 is:



Dollar amounts in millions
Net actuarial loss	$	6.1
Prior service cost	0.5
Total	$	6.6

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
2018	31.4
2019	19.7
2020	20.9
2021	20.6
2022	25.5
2023– 2027	100.0

Schedule of Allocation of Plan Assets [Table Text Block]

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



	Target Allocation 2017		Actual Allocation
	Target Allocation 2017		2017		2016
Asset category
US Plans
Equity securities	40	%	40	%	40	%
Debt securities	20	%	20	%	20	%
Multi-Strategy Funds	40	%	40	%	40	%
Total Allocation for US Plans	100	%	100	%	100	%

Non-US Plans
Equity securities	27	%	28	%	29	%
Debt securities	71	%	70	%	70	%
Other, including cash and cash equivalents	2	%	2	%	1	%
Total Allocation for Non-US Plans	100	%	100	%	100	%

The fair value of our pension plan assets at December 31, 2017 and December 31, 2016, 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, 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.



Dollar amounts in millions Asset Category	December 31, 2016		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	$	51.3	$	38.0	$	13.3	$	—
International stock funds	38.5		13.5		25.0		—
Fixed income investment funds:^(b)
Domestic bond funds	36.8		36.8		—		—
International bond funds	36.0		—		36.0		—
Multi-strategy funds^(c)	75.1		62.9		—		12.2
Cash & cash equivalents	2.2		—		2.2		—
Total	$	239.9	$	151.2	$	76.5	$	12.2

_______________


^(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, 2016	$	13.3
Total unrealized gains	0.3
Contribution (redemption)	(1.5		)
Management fees	0.1
Balance at December 31, 2016	$	12.2
Total unrealized gains	$	0.7
Contribution (redemption)	0.1
Management fees	(0.1		)
Balance at December 31, 2017	$	12.9

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

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

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			2015
Expected stock price volatility	41		%	45		%	54		%
Expected dividend yield	—		%	—		%	—		%
Risk-free interest rate	2.1		%	1.4		%	1.5		%
Expected life of options (in years)	6.0 years			6 years			6 years
Weighted average fair value of options and SSARs granted	$	8.02		$	6.99		$	8.80

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

The following table summarizes stock options and SSARs outstanding as of December 31, 2017 as well as activity during the last year.



	Options/ SSARs		Weighted Average Exercise Price		Weighted Average Contractual Term (in years)	Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2016	4,229,247		$	15.84
Granted	285,934		$	19.14
Exercised	(1,093,553	)	$	12.79
Expired	(993,752	)	$	22.94
Forfeited	(23,068	)	$	16.54
Outstanding at December 31, 2017	2,404,808		$	14.76	5.8	$	27.7
Vested and expected to vest at December 31, 2017⁽¹⁾	2,284,568		$	14.76	5.8	$	27.5
Exercisable at December 31, 2017	1,703,031		$	13.70	4.8	$	21.4

_______________


⁽¹⁾	Expected to vest based upon historical forfeiture rate

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

The following table summarizes restricted awards outstanding as of December 31, 2017 as well as activity during the past year.



	Shares		Weighted Average Grant Date Fair Value		Weighted Average Contractual Term (in years)	Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2016	676,267		$	16.64
Granted	249,011		$	20.11
Vested	(207,306	)	$	17.17
Forfeited	(54,802	)	$	16.92
Outstanding at December 31, 2017	663,170		$	17.75	1.2	$	17.4

Restricted Stock Activity [Table Text Block]

Asset Retirement Obligation (Tables)

12 Months Ended

Dec. 31, 2017

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	2017			2016
Beginning balance	$	10.2		$	10.0
Accretion expense	0.8			0.8
Adjusted to expense during the year	—			(0.3		)
Payments made	(0.3		)	(0.4		)
Translation	0.1			0.1
Ending balance	$	10.8		$	10.2

Other Operating Credits and Charges, Net (Tables)

12 Months Ended

Dec. 31, 2017

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	2017			2016			2015
Contingent consideration fair value adjustment	—			—			0.2
Adjustments to retirement accounts	(3.1		)	—			(0.8		)
Refund of sales and use taxes	0.8			—			—
Loss related to intangible forest license	—			—			(11.6		)
Loss due to marketing settlement	—			—			(1.0		)
Loss on workers compensation reserve	(0.9		)	—			—
Adjustment to product related warranty reserves	(5.4		)	(16.9		)	1.4
Additions to environmental related contingency reserves and asset retirement obligations	—			—			(4.6		)
Other	0.6			(0.5		)	0.1
	$	(8.0	)	$	(17.4	)	$	(16.3	)
Other operating charges and credits associated with unconsolidated affiliates:
Valuation allowance associated with deferred taxes	—			—			0.7
	$	—		$	—		$	0.7

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

12 Months Ended

Dec. 31, 2017

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	2017			2016			2015
Impairment charges on long-lived assets	$	(9.1	)	$	(0.8	)	$	(1.5	)
Gain (loss) on sale or other disposition of other long-lived assets	2.3			9.2			(0.6		)
	$	(6.8	)	$	8.4		$	(2.1	)

Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

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	2017			2016
Environmental reserves	$	15.0		$	15.9
Other reserves	0.1			0.2
Total contingencies	15.1			16.1
Current portion	(3.4		)	(3.4		)
Long-term portion	$	11.7		$	12.7

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	2017			2016			2015
Beginning balance	$	15.9		$	16.6		$	13.6
Adjusted to expense (income) during the year	1.2			0.7			0.5
Adjusted to expense (income) through other operating credits and charges, net	—			—			3.2
Payments made	(2.1		)	(1.4		)	(0.7		)
Ending balance	$	15.0		$	15.9		$	16.6

- 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, 2017

Commitments and Contingencies Disclosure [Abstract]

Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block]

At December 31, 2017, future minimum annual rent commitments are as follows:



Dollar amounts in millions
Year ended December 31,
2018	$	2.7
2019	2.7
2020	1.9
2021	1.9
2022	1.0
2023 and thereafter	—
Total	$	10.2

Product Warranty (Tables)

12 Months Ended

Dec. 31, 2017

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	2017			2016			2015
Beginning balance	$	24.1		$	21.0		$	31.4
Accrued to expense during the year	1.0			0.8			0.7
Accrued/ (credited) to other operating credits and charges	5.4			16.9			(1.4		)
Accrued to discontinued operations	1.5			0.5			2.5
Foreign currency translation	2.2			(0.2		)	(0.5		)
Payments made	(9.5		)	(14.9		)	(11.7		)
Total warranty reserves	24.7			24.1			21.0
Current portion of warranty reserves	(9.0		)	(9.0		)	(6.0		)
Long term portion of warranty reserves	$	15.7		$	15.1		$	15.0

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

12 Months Ended

Dec. 31, 2017

Discontinued Operations and Disposal Groups [Abstract]

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



Dollar amounts in millions	2017			2016			2015
Operating loss	$	(2.0	)	$	(0.8	)	$	(3.2	)
Cash provided by (used in) operations from discontinued operations	(1.8		)	(2.6		)	(4.3		)

- 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
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-Name Accounting Standards Codification
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+ Details

Accumulated Comprehensive Loss (Tables)

12 Months Ended

Dec. 31, 2017

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, 2017, 2016 and 2015.



				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, 2015	$	(33.7	)	$	(93.1	)	$	(5.9	)	$	2.6		$	(1.2	)	$	(131.3	)
Other comprehensive income (loss) before reclassifications	(21.4		)	9.5			0.7			1.4			0.2			(9.6		)
Income taxes	—			—			—			(0.7		)	—			(0.7		)
Net other comprehensive income (loss) before reclassifications	(21.4		)	9.5			0.7			0.7			0.2			(10.3		)
Amounts reclassified from accumulated comprehensive income (loss)	—			(6.8		)	(0.5		)	—			—			(7.3		)
Income taxes				2.6			0.2			—			—			2.8
Net amounts reclassified from cumulative other comprehensive income (loss)	—			(4.2		)	(0.3		)	—			—			(4.5		)
Total other comprehensive income (loss)	(21.4		)	5.3			0.4			0.7			0.2			(14.8		)
Balance at December 31, 2015	(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	)

Segment Information (Tables)

12 Months Ended

Dec. 31, 2017

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	2017			2016			2015
SALES BY BUSINESS SEGMENT
Siding	$	884.0		$	752.3		$	636.4
OSB	1,302.5			1,027.7			807.5
Engineered Wood Products	365.9			296.9			286.1
South America	155.3			136.9			134.9
Other products	30.0			26.9			29.0
Intersegment Sales	(3.8		)	(7.3		)	(1.4		)
Total sales	$	2,733.9		$	2,233.4		$	1,892.5
PROFIT (LOSS) BY BUSINESS SEGMENT
Siding	$	186.8		$	126.1		$	93.2
OSB	425.7			186.2			(46.3		)
Engineered Wood Products	14.9			(5.8		)	(7.3		)
South America	24.3			17.0			9.8
Other products	(3.4		)	(1.6		)	(2.8		)
Other operating credits and charges, net	(8.0		)	(17.4		)	(16.3		)
Gain (loss) on sales of and impairments of long-lived assets	(6.8		)	8.4			(2.1		)
General corporate and other expense, net	(110.1		)	(103.7		)	(84.8		)
Interest expense, net of capitalized interest	(19.3		)	(32.1		)	(31.2		)
Investment income	10.5			8.2			4.4
Other non-operating income (expense)	(4.4		)	(15.2		)	(5.3		)
Income (loss) from continuing operations before taxes	510.2			170.1			(88.7		)
Provision (benefit) for income taxes	119.1			19.8			(2.7		)
Income (loss) from continuing operations	$	391.1		$	150.3		$	(86.0	)



	Year ended December 31,
	2017		2016		2015
DEPRECIATION AND AMORTIZATION
Siding	$	30.9	$	27.4	$	19.7
OSB	61.6		58.6		57.0
Engineered Wood Products	15.8		12.7		12.6
South America	9.1		8.6		7.9
Other products	2.8		2.3		1.8
Non-segment related	3.1		3.2		2.9
Total depreciation and amortization	$	123.3	$	112.8	$	101.9

CAPITAL EXPENDITURES
Siding	$	63.0	$	49.9	$	75.7
OSB	58.4		49.3		26.5
Engineered Wood Products	6.0		5.3		4.1
South America	17.5		8.7		6.0
Other products	1.0		8.1		1.1
Non-segment related	2.7		3.5		0.4
Total capital expenditures	$	148.6	$	124.8	$	113.8

Information concerning identifiable assets by segment is as follows:



Dollar amounts in millions	December 31,
Dollar amounts in millions	2017		2016
IDENTIFIABLE ASSETS
Siding	$	371.8	$	344.1
OSB	577.5		555.0
Engineered Wood Products	116.3		115.6
South America	95.9		85.5
Other products	93.7		75.9
Non-segment related	1,193.3		855.1
Total assets	$	2,448.5	$	2,031.2

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	2017			2016			2015
GEOGRAPHIC LOCATIONS
Total Sales—Point of origin
U.S.	$	2,307		$	1,882		$	1,551
Canada	704			682			491
South America	165			137			135
Intercompany sales	(442		)	(468		)	(285		)
Total Sales	$	2,734		$	2,233		$	1,892
Operating profit (loss)
U.S.	$	458		$	235		$	84
Canada	166			70			(47		)
South America	24			17			10
Other operating credits and charges, net and gain (loss) on sales of and impairments of long-lived assets	(15		)	(9		)	(18		)
General corporate expense, loss on early debt extinguishment, other income(expense) and interest, net	(123		)	(143		)	(118		)
	510			170			(89		)
Provision (benefit) for income taxes	119			20			(3		)
Income (loss) from continuing operations	$	391		$	150		$	(86	)

IDENTIFIABLE TANGIBLE LONG LIVED ASSETS
U.S.	$	529		$	516		$	506
Canada	380			365			360
South America	73			57			50
Total assets	$	982		$	938		$	916

Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Entity Information [Line Items]
Capitalized Interest	$ 2.2	$ 1.9	$ 1.9
Customer Rebates	24.2	19.3
Consignment inventory	18.3	15.8
Advertising Expense	$ 19.1	$ 19.6	$ 15.5
Maximum
Entity Information [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Minimum
Entity Information [Line Items]
Equity Method Investment, Ownership Percentage	20.00%
All Customers [Member] [Member]
Entity Information [Line Items]
Concentration Risk, Percentage	46.00%	41.00%	45.00%

Summary of Significant Accounting Policies Inventory (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Inventory [Line Items]
Logs	$ 60.3	$ 54.6
Other raw materials	20.8	23.0
Semi finished inventory	24.3	16.8
Finished products	153.7	140.2
Total	$ 259.1	$ 234.6

Summary of Significant Accounting Policies Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Capitalized Interest	$ 2.2	$ 1.9	$ 1.9
Land, land improvements and logging roads, net of road amortization	162.7	154.4
Buildings	347.5	331.2
Machinery and equipment	1,977.4	1,934.1
Construction in progress	98.5	48.7
Property, Plant and Equipment, Gross	2,586.1	2,468.4
Accumulated depreciation	1,660.0	1,577.0
Property, Plant and Equipment, Net	$ 926.1	$ 891.4

Summary of Significant Accounting Policies Depreciation and Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cost of Goods Sold, Depreciation and Amortization	$ 120.1	$ 109.6	$ 98.9
Depreciation, Depletion and Amortization, Nonproduction	3.2	3.2	3.0
Depreciation and amortization	$ 123.3	$ 112.8	$ 101.9

Investments (Details) - Auction Rate Securities [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 0.4	$ 0.4
Gross Unrealized Gains	5.6	4.4
Gross Unrealized Losses	0.0
Fair Value	6.0	$ 4.8
Par Value Available For Sale Securities	$ 23.4

- 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, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 6.0	$ 4.8	$ 5.8
Fair Value, Measurements, Recurring
Assets, Fair Value Disclosure [Abstract]
Available for sale securities	6.0	4.8
Trading securities	3.1	2.6
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets, Fair Value Disclosure [Abstract]
Available for sale securities	0.0	0.0
Trading securities	3.1	2.6
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	6.0	4.8
Trading securities	$ 0.0	$ 0.0

Fair Value Measurements Unobservable Inputs Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Adjustment to contingent consideration fair value	$ 0.0	$ 0.0	$ 0.2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	4.8	5.8
Included in other comprehensive income	1.2	(1.0)
Ending balance	$ 6.0	$ 4.8	$ 5.8

Earnings Per Share (Details) - shares shares in Millions	12 Months Ended
Earnings Per Share (Details) - shares shares in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Weighted average number of shares outstanding - basic	144.4	143.4	142.4
Dilutive effect of employee stock plans	2.0	1.7	0.0
Dilutive effect of stock warrants	0.0	0.2	0.0
Dilutive potential common shares	2	1.9	0
Adjusted weighted average shares	146.4	145.3	142.4
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.2	2.6	4.9

Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Trade receivables	$ 124.6	$ 96.1
Income Taxes Receivable	2.2	1.7
Other receivables	16.6	11.5
Allowance for doubtful accounts	(0.9)	(1.0)
Total	$ 142.5	$ 108.3

Notes Receivable from Asset Sales (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Notes Receivable	$ 22.2	$ 22.2
Current portion	22.2	0.0
Notes Receivable, Long-Term Portion	0.0	22.2
Notes Receivable, Fair Value Disclosure	$ 23.0	23.0
Senior Notes 2018
Notes Receivables from Asset Sales, Stated Interest Rate	7.30%
Notes Receivable	$ 22.2	$ 22.2

Other Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 16.1	$ 9.7	$ 9.7
Goodwill, Additions during period	6.4
Acquired Intangible Assets, including Goodwill	17.4	0.0
Amortization of Intangible Assets	(3.6)	(3.3)
Intangible Assets, Net (Including Goodwill)	70.6	56.8	60.1
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	43.9	47.1	$ 50.4
Amortization of Intangible Assets	(3.2)	(3.3)
Timber Licenses, Initial Value	91.3
Technology-Based Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	10.6	$ 0.0
Finite-lived Intangible Assets Additions during period	11.0
Amortization of Intangible Assets	$ 0.4

Investments in and Advances to Affiliates (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	50.00%
Revenue from affiliates	$ 15.5	$ 11.7	$ 9.3
Expenses from affiliates	60.1	53.1	54.1
Due from affiliates	3.6	1.9
Due to affiliates	1.2	0.1
Cash Dividends Paid to Parent Company by Unconsolidated Subsidiaries	3.3
Income from affiliates, classified in cost of sales	4.0
Equity in income of unconsolidated affiliates	$ 0.0	$ (5.2)	$ (6.7)

Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts Payable and Accrued Liabilities [Abstract]
Accounts payable	$ 112.3	$ 89.9
Salaries and wages payable	75.8	58.7
Taxes other than income taxes	3.0	3.6
Current portion of warranty reserves	9.0	9.0	$ 6.0
Accrued interest	6.0	5.4
Accrued rebates	24.2	19.3
Other accrued liabilities	6.8	5.6
Total Accounts payable and accrued liabilities	237.1	191.5
Capital Expenditures Incurred but Not yet Paid	$ 19.0	$ 9.8

Income Taxes Tax act (Details) - USD ($) $ in Millions	12 Months Ended
Income Taxes Tax act (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%
Effective Income Tax Rate, Change in Federal Statutory Enacted Rate for Future Periods, Percent	21.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ 18.4

Income Taxes Income Statement table (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Domestic	$ 341.8	$ 98.4	$ (8.7)
Foreign	168.4	71.7	(80.0)
Income (loss) from continuing operations before income taxes, extraordinary items, noncontrolling interest	$ 510.2	$ 170.1	$ (88.7)

Income Taxes Income tax provision (benefit) from continuing operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
U.S. federal	$ 105.8	$ 60.4	$ (2.4)
State and local	4.4	4.4	(0.5)
Foreign	7.9	10.4	2.6
Net current tax provision (benefit)	118.1	75.2	(0.3)
U.S federal	(19.3)	(48.1)	(1.1)
State and local	8.0	1.2	(1.8)
Foreign	38.2	11.7	(26.6)
Net valuation allowance increase (decrease)	(25.9)	(20.2)	27.1
Deferred income tax expense (benefit)	1.0	(55.4)	(2.4)
Provision (benefit) for income taxes	119.1	19.8	(2.7)
Income Tax Refunds	0.3	0.8	0.1
Income Taxes Paid	143.1	8.7	$ 16.0
Income Taxes Receivable	2.2	1.7
Income taxes payable	$ 4.5	$ 31.3

Income Taxes Reconciliation of deferred taxes (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Valuation Allowance [Line Items]
Accrued liabilities	$ 53.4	$ 83.9
Benefit of capital loss and NOL carryovers	38.9	83.4
Deferred Tax Assets, Other	10.2	11.6
Inventory	6.6	6.9
Market value write down of ARS	4.9	8.8
Benefit of tax credit carryovers	3.5	3.7
Valuation Allowance, Amount	(13.6)	(37.9)
Deferred Tax Assets, Net	103.9	160.4
Property, plant and equipment	(118.2)	(164.2)
Timber and timberlands	11.4	11.6
Installment sale gain deferral	5.2	8.0
Total Deferred Tax Liabilities	(134.8)	(183.8)
Deferred Tax Liabilities, Net	(30.9)	(23.4)
Long-term deferred tax asset	(2.5)	(4.3)
Long-term deferred tax liability	$ (33.4)	$ (27.7)

Income Taxes NOL and credit carryovers (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	$ 38.9	$ 83.4
Federal NOL carryover valuation allowance	(9.7)
Valuation Allowance, Amount	(13.6)	$ (37.9)
Federal NOL carryover	42.4
Canada Revenue Agency [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Capital Loss Carryforwards	6.2
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	14.1
Operating Loss Carryforwards, Valuation Allowance	(1.4)
Canada Revenue Agency [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	16.7
Federal NOL carryover valuation allowance	0.0
Deferred Tax Assets, Tax Credit Carryforwards	2.7
Operating Loss Carryforwards, Valuation Allowance	0.0
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Federal NOL carryover valuation allowance	(0.1)
Deferred Tax Assets, Tax Credit Carryforwards	0.7
Capital Loss Carryforward [Member] \| Canada Revenue Agency [Member]
Operating Loss Carryforwards [Line Items]
Valuation Allowance, Amount	(6.2)
Secretariat of the Federal Revenue Bureau of Brazil [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	2.0
Operating Loss Carryforwards, Valuation Allowance	$ (2.0)

Income Taxes (Details) - USD ($)	12 Months Ended
Income Taxes (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 16,900,000
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal tax rate	35.00%	35.00%	35.00%
State and local income taxes	2.00%	2.00%	(2.00%)
Tax credits	1.00%	12.00%	0.00%
Capital gain - timber	0.00%	(15.00%)	0.00%
Stock-based compensation	(0.00%)	(2.00%)	(0.00%)
Domestic manufacturing deduction	(2.00%)	(2.00%)	(0.00%)
Valuation allowance	(6.00%)	(12.00%)	31.00%
Uncertain tax positions	1.00%	21.00%	(4.00%)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ (0.03)
Other, net	(1.00%)	0.00%	2.00%
Effective tax rate (%)	23.00%	12.00%	(3.00%)
Foreign tax rate
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effect of foreign tax rates / foreign exhchange	(3.00%)	(5.00%)	13.00%
Foreign Currency Gain (Loss)
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Effect of foreign tax rates / foreign exhchange	1.00%	2.00%	(8.00%)

Income Taxes Uncertain tax positions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2012
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits	$ 40.3	$ 39.8	$ 4.1	$ 42.2
Tax positions taken in current year	0.6	26.9	0.0
Tax positions taken in prior years	1.2	10.4	0.9
Tax positions taken in current year	0.0	0.0	0.0
Tax positions taken in prior years	(1.3)	0.0	(0.5)
Settlements during the year	0.0	0.0	(34.7)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	0.0	(1.6)	$ (3.8)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	39.9	39.8
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	0.7	3.0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 3.7	$ 3.0

Non-operating Income (Expense) Disclosure (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Nonoperating Income (Expense) [Abstract]
Interest Expense	$ (20.6)	$ (32.9)	$ (32.0)
Amortization of financing costs and discounts	(0.9)	(1.1)	(1.1)
Capitalized Interest	2.2	1.9	1.9
Interest expense, net of capitalized interest	(19.3)	(32.1)	(31.2)
Investment Income	9.5	8.0	4.9
SERP market adjustments	1.0	0.2	(0.5)
Investment income	10.5	8.2	4.4
Foreign currency losses	(4.4)	2.1	(5.3)
Loss on early debt extinguishment	0.0	(17.3)	0.0
Other Nonoperating Income (Expense)	(4.4)	(15.2)	(5.3)
Total non-operating income (expense)	$ (13.2)	$ (39.1)	$ (32.1)

Long-term Debt (Details) $ in Millions	12 Months Ended
Long-term Debt (Details) $ in Millions	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CLP ($)	Dec. 31, 2016 USD ($)	May 01, 2012
Notes and Loans Payable [Abstract]
Long-term Debt, Gross	$ 380.4		$ 382.3
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(4.5)		(5.3)
Long-term debt	375.9		377.0
Current portion of long-term debt	25.1		2.6
Long-term debt, excluding current portion	350.8		374.4
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	(4.4)		(5.0)
Long-term debt	345.6		345.0
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	$ 7.7		7.0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(0.1)		(0.3)
Long-term debt	7.6		6.7
Repayments of Debt	$ 6.8
Brazilian export financing facility, maturing 2017 [Member]
Notes and Loans Payable [Abstract]
Debt, interest rate, stated percentage	6.65%	6.65%
Long-term Debt, Gross	$ 0.0		2.0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	0.0		0.0
Long-term debt	0.0		2.0
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	$ 22.0		22.0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	0.0		0.0
Long-term debt	22.0		22.0
Other Debt Obligations [Member]
Notes and Loans Payable [Abstract]
Long-term Debt, Gross	0.7		1.3
Long-term debt	$ 0.7		$ 1.3

Long-term Debt Narrative (Details)	12 Months Ended
Long-term Debt Narrative (Details)	Dec. 31, 2017 USD ($) payments	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 CLP ($)	May 01, 2012
Debt Instrument [Line Items]
Amortization of financing costs and discounts	$ 900,000	$ 1,100,000	$ 1,100,000
Notes Receivable	22,200,000	22,200,000
Impact of foreign currency exchange rates	(2,100,000)	2,000,000	(2,800,000)
Impact of UF change	400,000	3,800,000	800,000
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	$ (17,300,000)	0
Debt, weighted average interest rate	5.10%	5.10%		5.10%
Interest paid, net	$ 17,500,000	$ 27,200,000	$ 36,900,000
Senior notes payable 2018 [Member]
Debt Instrument [Line Items]
Fair value of debt	22,400,000	23,400,000
Amount of loan issuance	348,600,000
Notes Payable	22,000,000
Notes Receivable	$ 22,200,000
Amount of indebtedness liable for in event of default of notes receivable collateral	10.00%			10.00%
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
Repayments of Debt	6,800,000
Impact of foreign currency exchange rates	600,000.0
Impact of UF change	$ 100,000
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
Brazilian export financing facility, maturing 2017 [Member]
Debt Instrument [Line Items]
Debt, interest rate, stated percentage	6.65%			6.65%
Number of future semi-annual payments \| payments	10,000,000
Senior unsecured notes, maturing 2024 [Member]
Debt Instrument [Line Items]
Fair value of debt	$ 363,900,000	$ 344,000,000
Amount of loan issuance	$ 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, 2017	Dec. 31, 2016
2017	$ 25.1
2018	5.3
2019	0.0
2020	0.0
2021	0.0
2022 and after	350.0
Long-term debt	$ 380.4	$ 382.3

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, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Benefits Paid	$ 18.2	$ 21.4
Defined Benefit Plan, Plan Assets, Benefits Paid	18.2	21.4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	4.9	4.3	$ 3.8
Interest cost	12.5	13.1	13.1
Expected return on plan assets	(13.1)	(13.1)	(15.0)
Amortization of prior service cost	0.5	0.5	0.5
Amortization of net actuarial loss	6.2	5.4	6.8
Net periodic pension cost	11.0	10.2	9.2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	$ 3.1	$ 0.0	$ 0.8
Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.90%	4.10%	3.80%
Rate of compensation increase	0.70%	0.70%	0.70%
Expected return on plan assets	5.40%	5.40%	6.00%
Other changes in plan assets and benefit obligations recognized in other comprehensive incom [Abstract]
Net actuarial (gain) loss	$ (3.9)	$ 4.8	$ 0.8
Amortization of net actuarial loss	(9.3)	(5.4)	(7.6)
Amortization of prior service cost	(0.5)	(0.5)	(0.5)
Foreign exchange rate changes	0.0	0.0	(0.1)
Total recognized in OCI	$ (13.7)	$ (1.1)	$ (7.4)
Maximum benefit amortization period	20 years
Approximate percentage of assets represented by most significant plans	78.00%
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, 2017

Dec. 31, 2016

Dec. 31, 2015

Change in Benefit Obligation [Roll Forward]

Beginning of year balance

$ 331.9

$ 330.8

Service cost

4.9

4.3

$ 3.8

Interest cost

12.5

13.1

Actuarial (gain)/loss

10.8

3.5

Foreign exchange rate changes

3.6

1.6

End of year balance

345.5

331.9

330.8

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

239.9

237.4

Actual return on plan assets

27.8

11.8

Employer contribution

12.7

10.5

Foreign exchange rate changes

3.7

1.6

Fair value of plan assets, end of year balance

265.9

239.9

237.4

Funded status

$ (79.6)

$ (92.0)

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

Discount rate

3.40%

3.90%

Rate of compensation increase

0.70%

Amounts Recognized in Balance Sheet [Abstract]

Noncurrent pension assets, included in “Other assets”

$ 1.4

$ 0.9

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

(12.1)

(0.2)

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

(68.9)

(92.7)

Total

(79.6)

(92.0)

Amounts recognized in other comprehensive income—pre-tax

Net actuarial loss

128.0

140.6

Prior service cost

8.0

8.4

Total

136.0

149.0

Defined Benefit Plan, Accumulated Benefit Obligation

343.2

326.8

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

Accumulated benefit obligations

287.9

284.0

Fair value of plan assets

207.7

194.2

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

Projected benefit obligations

288.7

287.1

Fair value of plan assets

207.7

194.2

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

Net actuarial loss

6.1

Prior service cost

0.5

Total

6.6

Benefits Expected to be Paid from Benefit Plans [Abstract]

31.4

19.7

20.9

20.6

25.5

100.0

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[1]

75.1

Fair value of plan assets, end of year balance

^[1]

82.5

75.1

Domestic stock funds

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[2]

51.3

Fair value of plan assets, end of year balance

^[2]

56.2

51.3

International stock funds

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[2]

38.5

Fair value of plan assets, end of year balance

^[2]

43.1

38.5

Domestic bond funds

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

^[2]

36.8

Fair value of plan assets, end of year balance

40.2

^[3]

36.8

^[2]

Significant Unobservable Inputs (Level 3)

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

12.2

Fair value of plan assets, end of year balance

12.9

12.2

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

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

12.2

^[1]

13.3

Fair value of plan assets, end of year balance

12.9

^[1]

12.2

^[1]

$ 13.3

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

151.2

Fair value of plan assets, end of year balance

147.5

151.2

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]

62.9

Fair value of plan assets, end of year balance

^[1]

69.6

62.9

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]

38.0

Fair value of plan assets, end of year balance

^[2]

42.2

38.0

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]

13.5

Fair value of plan assets, end of year balance

^[2]

15.5

13.5

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]

36.8

Fair value of plan assets, end of year balance

^[2]

20.2

36.8

Fair Value, Inputs, Level 2

Change in Assets (Fair Value) [Roll Forward]

Fair value of plan assets, beginning of year balance

76.5

Fair value of plan assets, end of year balance

105.5

76.5

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

^[1]

0.0

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]

13.3

Fair value of plan assets, end of year balance

^[2]

14.0

13.3

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]

25.0

Fair value of plan assets, end of year balance

^[2]

27.6

25.0

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]

0.0

Fair value of plan assets, end of year balance

^[2]

$ 20.0

$ 0.0

[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 Asset Allocation and Fair Value of Plan Assets (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

$ 265.9

$ 239.9

$ 237.4

Quoted Prices in Active Markets for Identical Assets (Level 1)

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

147.5

151.2

Fair Value, Inputs, Level 2

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

105.5

76.5

Significant Unobservable Inputs (Level 3)

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

12.9

12.2

Multi-strategy Funds

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

^[1]

82.5

75.1

Multi-strategy Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

^[1]

69.6

62.9

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

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

^[1]

0.0

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

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

12.9

^[1]

12.2

^[1]

$ 13.3

Cash and Cash Equivalents

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

3.0

2.2

Cash and Cash Equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

0.0

Cash and Cash Equivalents | Fair Value, Inputs, Level 2

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

3.0

2.2

Cash and Cash Equivalents | Significant Unobservable Inputs (Level 3)

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

0.0

Domestic stock funds

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

^[2]

56.2

51.3

Domestic stock funds | Quoted Prices in Active Markets for Identical Assets (Level 1)

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

^[2]

42.2

38.0

Domestic stock funds | Fair Value, Inputs, Level 2

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

^[2]

14.0

13.3

Domestic stock funds | Significant Unobservable Inputs (Level 3)

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

^[2]

0.0

International stock funds

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

^[2]

43.1

38.5

International stock funds | Quoted Prices in Active Markets for Identical Assets (Level 1)

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

^[2]

15.5

13.5

International stock funds | Fair Value, Inputs, Level 2

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

^[2]

27.6

25.0

International stock funds | Significant Unobservable Inputs (Level 3)

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

^[2]

0.0

Domestic bond funds

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

40.2

^[3]

36.8

^[2]

Domestic bond funds | Quoted Prices in Active Markets for Identical Assets (Level 1)

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

^[2]

20.2

36.8

Domestic bond funds | Fair Value, Inputs, Level 2

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

^[2]

20.0

0.0

Domestic bond funds | Significant Unobservable Inputs (Level 3)

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

^[2]

0.0

International bond funds

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

^[3]

40.9

36.0

International bond funds | Quoted Prices in Active Markets for Identical Assets (Level 1)

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

^[2]

0.0

International bond funds | Fair Value, Inputs, Level 2

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

^[2]

40.9

36.0

International bond funds | Significant Unobservable Inputs (Level 3)

Defined Benefit Plan Disclosure [Line Items]

Defined Benefit Plan, Fair Value of Plan Assets

^[2]

$ 0.0

UNITED STATES

Target Allocations [Abstract]

Target Plan Asset Allocation 2016

100.00%

Defined Benefit Plan, Actual Plan Asset Allocation

100.00%

UNITED STATES | Equity Securities

Target Allocations [Abstract]

Target Plan Asset Allocation 2016

40.00%

Defined Benefit Plan, Actual Plan Asset Allocation

40.00%

UNITED STATES | Debt Securities

Target Allocations [Abstract]

Target Plan Asset Allocation 2016

20.00%

Defined Benefit Plan, Actual Plan Asset Allocation

20.00%

UNITED STATES | Multi-strategy Funds

Target Allocations [Abstract]

Target Plan Asset Allocation 2016

40.00%

Defined Benefit Plan, Actual Plan Asset Allocation

40.00%

Non-US [Member]

Target Allocations [Abstract]

Target Plan Asset Allocation 2016

100.00%

Defined Benefit Plan, Actual Plan Asset Allocation

100.00%

Non-US [Member] | Equity Securities

Target Allocations [Abstract]

Target Plan Asset Allocation 2016

27.10%

Defined Benefit Plan, Actual Plan Asset Allocation

27.80%

29.00%

Non-US [Member] | Debt Securities

Target Allocations [Abstract]

Target Plan Asset Allocation 2016

71.30%

Defined Benefit Plan, Actual Plan Asset Allocation

70.40%

70.00%

Non-US [Member] | Cash and Cash Equivalents

Target Allocations [Abstract]

Target Plan Asset Allocation 2016

1.60%

Defined Benefit Plan, Actual Plan Asset Allocation

1.80%

1.00%

[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 Level 3 Rollforward (Details) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2017

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

$ 239.9

$ 237.4

Fair value of plan assets, end of year balance

239.9

237.4

$ 265.9

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]

75.1

Fair value of plan assets, end of year balance

^[1]

75.1

82.5

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

12.2

Fair value of plan assets, end of year balance

12.2

12.9

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

12.2

^[1]

13.3

Total unrealized gains (losses)

0.7

0.3

Defined Benefit Plan, Redemptions

0.1

1.5

Defined Benefit Plan, Mangement Fees

(0.1)

0.1

Fair value of plan assets, end of year balance

$ 12.2

^[1]

$ 13.3

$ 12.9

^[1]

[1]	The multi-strategy funds invest in various hedge funds that employ a fund of funds strategy.

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, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Contribution Plans [Abstract]
Expenses related to defined contribution plans and multiemployer plan	$ 9.7	$ 8.7	$ 8.0
Funded status	$ (79.6)	(92.0)
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"	$ (1.9)	(1.8)
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	1.4
Total market value of plan assets represented by LP common stock	8.50%
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	$ 9.0	$ 7.8

Stockholders' Equity Preferred stock (Details) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
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
Rights [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	2,000,000

Stockholders' Equity Rights plan (Details)	12 Months Ended
Stockholders' Equity Rights plan (Details)	Dec. 31, 2017 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Voting Rights	.15
Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares	$ 100.00
Class of Warrant or Right, Redemption Price of Warrants or Rights \| $	$ 0.01

Common Stock Plan (Details) - USD ($) shares in Millions	12 Months Ended
Common Stock Plan (Details) - USD ($) shares in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense related to all stock-based compensation plans	$ 9,700,000	$ 13,000,000	$ 9,300,000
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	800,000.0	3,400,000.0	0.0
Payments Related to Tax Withholding for Share-based Compensation	$ (5,900,000)	$ (9,200,000)	$ (6,100,000)
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	2.9

Stock-Based Compensation Valuation Assumptions (Details) - Options and SSARs [Member] - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected stock price volatility	41.00%	45.00%	54.00%
Expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate	2.10%	1.40%	1.50%
Expected life of options	6 years	6 years	6 years
Weighted average fair value of options and SSARs granted	$ 8.02	$ 6.99	$ 8.80

Stock-Based Compensation Outstanding Options and SSARs (Details) - USD ($)
$ / shares in Units, $ in Millions

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]

Beginning balance

4,229,247

Options / SSARs granted

286,000

Options / SSARs exercised

(1,094,000)

Options / SSARs cancelled

(993,752)

Options/ SSARs forfeited

(23,068)

Ending balance

2,405,000

4,229,247

Vested and expected to vest

^[1]

2,285,000

Options / SSARs exercisable

1,703,031,000

Options / SSARs outstanding Weighted Average Exercise Price

$ 14.76

$ 15.84

SSARs granted Weighted Average Exercise Price

19.14

Options / SSARs exercised Weighted Average Exercise Price

12.79

Options / SSARs cancelled Weighted Average Exercise Price

22.94

Share Based Compensation Arrangement by Share Based Payment Award, Options And Ssars, Forfeitures in Period, Weighted Average Exercise Price

$ 16.54

Options / SSARs outstanding Weighted Average Contractual Term (in years)

5 years 10 months 6 days

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

$ 27.7

Vested and expected to vest, weighted average term

5 years 10 months 6 days

Vested and expected to vest Aggregate Intrinsic Value (in millions)

^[1]

$ 27.5

Share Based Compensation Arrangement by Share Based Payment Award, Options And Ssars, Exercisable, Weighted Average Exercise Price

$ 13.70

Share Based Compensation Arrangement by Share Based Payment Award, Options And Ssars, Exercisable, Weighted Average Remaining Contractual Term

4 years 9 months 26 days

Options / SSARs exercisable Aggregate Intrinsic Value (in millions)

$ 21.4

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

26.5

$ 29.8

$ 23.9

Options and Ssars [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]

Unrecognized compensation costs

2.0

Allocated Share-based Compensation Expense

$ 2.5

$ 4.6

$ 3.6

Options and Ssars [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]

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

1 year 6 months

[1]	xpected to vest based upon historical forfeiture rate

Stock-Based Compensation Restricted Stock Units (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 3.9	$ 4.7	$ 3.5
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Beginning balance	676,267
Units granted	249,011
Units vested	(207,306)
Units forfeited	(54,802)
Ending balance	663,170	676,267
Units Outstanding, Weighted Average Grant Date Fair Value	$ 17.75	$ 16.64
Units Granted, Weighted Average Grant Date Fair Value	20.11
Units vested during period, weighted average price	17.17
Units forfeited, Weighted Average Grant Date Fair Value	$ 16.92
RSUs weighted average contractual term	1 year 2 months
RSUs aggregate intrinsic value	$ 17,400,000
Fair Value of Awards vested during period	$ 4.5	$ 2.4	$ 5.4
Unrecognized compensation costs	$ 4.1

Stock-Based Compensation RestrictedShares (Details) - Restricted Stock [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 1.5	$ 2.4	$ 1.7
Unrecognized compensation costs	$ 2.2
Weighted-average period of years costs are expected to be recognied over	1 year 3 months 20 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Shares granted	109,386
Shares vested	(115,352)
Shares forfeited	(28,356)
Ending balance	311,215	345,537
Units Outstanding, Weighted Average Grant Date Fair Value	$ 17.33	$ 16.73
Restricted stock awards granted Weighted Average Grate Date Fair Value	19.80
Shares vested during period, weighted average price	17.92
Restrictions lapsing Weighted Average Grant Date Fair Value	$ 17.10
Fair Value of Awards vested during period	$ 2.2	$ 1.4	$ 3.8

Stockholders' Equity Perfromance Shares (PSUs) (Details) - Performance Shares [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 1.6	$ 1.0
Unrecognized compensation costs	$ 1.8
Weighted-average period of years costs are expected to be recognied over	1 year 7 months 9 days
Beginning balance	85,361
Units granted	121,724
Units vested	0
Units forfeited	(19,011)
Ending balance	188,074	85,361
Units Outstanding, Weighted Average Grant Date Fair Value	$ 23.08	$ 20.45
Units Granted, Weighted Average Grant Date Fair Value	24.87
Units vested during period, weighted average price	0.00
Units forfeited, Weighted Average Grant Date Fair Value	$ 22.71

Asset Retirement Obligation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
ASSET RETIREMENT OBLIGATIONS [Abstract]
Beginning balance	$ 10.2	$ 10.0
Accretion Expense	0.8	0.8
Accrued to expense during the year	0.0	(0.3)
Payments made	(0.3)	(0.4)
Asset Retirement Obligation, Foreign Currency Translation	0.1	0.1
Ending balance	$ 10.8	$ 10.2

Other Operating Credits and Charges, Net (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Gain Contingencies [Line Items]
Adjustment to contingent consideration fair value		$ 0.0	$ 0.0	$ 0.2
Adjustments to retirement accounts		3.1	0.0	0.8
Refund of sales and use taxes		0.8	0.0	0.0
Loss related to intangible forest license	$ 11.6	0.0	0.0	11.6
Loss due to marketing settlement		0.0	0.0	(1.0)
Loss on workers compensation reserves		0.9	0.0	0.0
Product Warranty Accrual, Period Increase (Decrease)		5.4	(16.9)	1.4
Addition to environmental related contingency reserves		0.0	0.0	(4.6)
Other Expenses			(0.5)
Other Income		0.6		0.1
Abitibi [Domain]
Gain Contingencies [Line Items]
Other Operating Credits and Charges Associated with Unconsolidated Affiliates		0.0	0.0	0.7
Unconsolidated Affiliates
Gain Contingencies [Line Items]
Other Operating Credits and Charges Associated with Unconsolidated Affiliates		$ 0.0	$ 0.0	$ 0.7

Gain (loss) on sales or impairment of long lived assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Impaired Long-Lived Assets Held and Used [Line Items]
Asset Impairment Charges	$ (9.1)	$ (0.8)	$ (1.5)
Gain Loss On Sale Or Impairment Of Long Lived Assets, Net	$ (6.8)	8.4	(2.1)
Impaired Long-Lived Assets Held and Used, Facts and Circumstances Leading to Impairment	4.7
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss	$ 3.0	0.8	$ 1.2
Impairment of Tangible Assets, Other Descriptors			.3
Other Asset Impairment Charges	$ 2.3	(10.6)
Gain (Loss) on Disposition of Property Plant Equipment		(1.4)	$ (0.6)
Gain (Loss) on Disposition of Assets		$ 9.2	$ (0.6)

Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
Contingencies (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2012
Loss Contingencies [Line Items]
Loss contingency accrual	$ 15.1	$ 16.1
Current portion of contingency reserves	(3.4)	(3.4)
Long-term portion of contingency reserves	11.7	12.7
Other operating charges and credits [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Period Increase (Decrease)	0.0	0.0	$ (3.2)
Reserve for Environmental Costs [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Period Increase (Decrease)	(1.2)	(0.7)	(0.5)
Loss contingency accrual	15.0	15.9	$ 16.6	$ 13.6
Hardboard Siding Reserves
Loss Contingencies [Line Items]
Loss contingency accrual	$ 0.1	$ 0.2

Contingencies Enviromental liabilities rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Beginning Balance	$ 16.1
Ending Balance	15.1	$ 16.1
Reserve for Environmental Costs [Member]
Beginning Balance	15.9	16.6
Adjusted to expense (income) during the year	1.2	0.7	$ 0.5
Payments made	2.1	1.4	0.7
Ending Balance	15.0	15.9	16.6
Other operating charges and credits [Member]
Adjusted to expense (income) during the year	0.0	$ 0.0	$ 3.2
Formal cost share [Member]
Other Unrecorded Amounts	2.1
Indemnification Agreement [Member]
Other Unrecorded Amounts	2.1
Other Reserves [Member]
Other Unrecorded Amounts	$ 0.3

Committments and Contingent Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
2014	$ 2.7
2015	2.7
2016	1.9
2017	1.9
2018	1.0
After 2018	0.0
Total	10.2
Operating Leases, Rent Expense	$ 12.5	$ 11.0	$ 10.5

Product Warranty (Details) $ in Millions, $ in Millions	12 Months Ended
Product Warranty (Details) $ in Millions, $ in Millions	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CAD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2002 CAD ($)
Product Liability Contingency [Line Items]
Indemnity					$ 5.0			$ 15.0
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Beginning Balance	$ 24.1	$ 21.0
Product Warranty Accrual, Warranties Issued	1.0	0.8	$ 0.7
Adjustment related to product related warranty reserves	5.4	16.9	1.4
Product Warranty Accrual, Discontinued Operations	(1.5)	(0.5)	(2.5)
Product Warranty Accrual, Currency Translation, Increase (Decrease)	2.2	(0.2)	(0.5)
Product Warranty Accrual, Payments	(9.5)	(14.9)	(11.7)
Ending Balance	24.1	21.0	21.0	$ 24.7		$ 24.1	$ 31.4
Current portion of warranty reserves			(6.0)	(9.0)		(9.0)
Long-term portion of warranty reserves			15.0	$ 15.7		$ 15.1
decking [Member]
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Product Warranty Accrual, Warranties Issued	$ 1.5	0.5
Damages from Product Defects [Member]
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Product Warranty Accrual, Discontinued Operations		$ 0.8	$ (2.5)

Discontinued Operations (Details) - USD ($) $ in Millions	12 Months Ended
Discontinued Operations (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash Provided by (Used in) Operating Activities, Discontinued Operations	$ (1.8)	$ (2.6)	$ (4.3)
Loss from discontinued operations before taxes	(2.0)	(0.8)	(3.2)
Product Warranty Accrual, Discontinued Operations	1.5	0.5	2.5
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	$ 1.3	2.3	3.6
Product Warranty Accrual, Discontinued Operations		$ (0.8)	$ 2.5

- 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

Accumulated Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax	$ (4.5)	$ (0.3)	$ 3.9
Accumulated comprehensive loss, net of tax, beginning of period	(122.1)	(137.2)	(146.1)	$ (131.3)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	10.2	2.9	(9.6)
Other Comprehensive Income (Loss) before Reclassifications, Tax	1.4	(2.2)	0.7
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	8.8	5.1	(10.3)
Reclassification from accumulated other comprehensive income, current period, before tax	9.7	6.0	(7.3)
Reclassification from AOCI, Current Period, Tax	(3.4)	(2.2)	2.8
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	6.3	3.8	(4.5)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	15.1	8.9	(14.8)
Accumulated comprehensive loss, net of tax, end of period	(122.1)	(137.2)	(146.1)	(131.3)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated comprehensive loss, net of tax, beginning of period	(39.7)	(46.3)	(55.1)	(33.7)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	6.6	8.8	(21.4)
Other Comprehensive Income (Loss) before Reclassifications, Tax	0.0	0.0	0.0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	6.6	8.8	(21.4)
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
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	6.6	8.8	(21.4)
Accumulated comprehensive loss, net of tax, end of period	(39.7)	(46.3)	(55.1)	(33.7)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated comprehensive loss, net of tax, beginning of period	(79.5)	(87.7)	(87.8)	(93.1)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	3.2	(5.3)	9.5
Other Comprehensive Income (Loss) before Reclassifications, Tax	1.1	(1.9)	0.0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	2.1	(3.4)	9.5
Reclassification from accumulated other comprehensive income, current period, before tax	9.3	5.5	(6.8)
Reclassification from AOCI, Current Period, Tax	(3.2)	(2.0)	2.6
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	6.1	3.5	(4.2)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	8.2	0.1	5.3
Accumulated comprehensive loss, net of tax, end of period	(79.5)	(87.7)	(87.8)	(93.1)
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	(4.9)	(5.2)	(5.5)	(5.9)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0.0	0.0	0.7
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	0.7
Reclassification from accumulated other comprehensive income, current period, before tax	0.5	0.5	(0.5)
Reclassification from AOCI, Current Period, Tax	(0.2)	(0.2)	0.2
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.3	0.3	(0.3)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0.3	0.3	0.4
Accumulated comprehensive loss, net of tax, end of period	(4.9)	(5.2)	(5.5)	(5.9)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated comprehensive loss, net of tax, beginning of period	3.5	2.7	3.3	2.6
Other Comprehensive Income (Loss), before Reclassifications, before Tax	1.3	(1.0)	1.4
Other Comprehensive Income (Loss) before Reclassifications, Tax	0.5	(0.4)	0.7
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0.8	(0.6)	0.7
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	0.8	(0.6)	0.7
Accumulated comprehensive loss, net of tax, end of period	3.5	2.7	3.3	2.6
Accumulated Other Post Retirement Benefits Adjustment, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated comprehensive loss, net of tax, beginning of period	(1.5)	(0.7)	(1.0)	(1.2)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(0.9)	0.4	0.2
Other Comprehensive Income (Loss) before Reclassifications, Tax	(0.2)	0.1	0.0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(0.7)	0.3	0.2
Reclassification from accumulated other comprehensive income, current period, before tax	(0.1)	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	(0.1)	0.0	0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(0.8)	0.3	0.2
Accumulated comprehensive loss, net of tax, end of period	$ (1.5)	$ (0.7)	$ (1.0)	$ (1.2)

Selected Segment Data (Details) - USD ($) $ in Millions	12 Months Ended
Selected Segment Data (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 2,733.9	$ 2,233.4	$ 1,892.5
Operating income (loss)	523.4	204.0	(63.3)
Other operating credits and charges, net	(8.0)	(17.4)	(16.3)
(Gain) loss on sale or impairment of long-lived assets	(6.8)	8.4	(2.1)
Other General Expense	(110.1)	(103.7)	(84.8)
Other Nonoperating Income (Expense)	(4.4)	(15.2)	(5.3)
Foreign currency gains (losses)	(4.4)	2.1	(5.3)
Investment income	10.5	8.2	4.4
Interest expense, net of capitalized interest	(19.3)	(32.1)	(31.2)
Loss from continuing operations before taxes	510.2	170.1	(88.7)
Provision (benefit) for income taxes	(119.1)	(19.8)	2.7
Income (loss) from continuing operations	391.1	150.3	(86.0)
Depreciation and amortization	123.3	112.8	101.9
Payments to Acquire Property, Plant, and Equipment	148.6	124.8	113.8
OSB
Segment Reporting Information [Line Items]
Net sales	1,302.5	1,027.7	807.5
Operating income (loss)	425.7	186.2	(46.3)
Depreciation and amortization	61.6	58.6	57.0
Payments to Acquire Property, Plant, and Equipment	58.4	49.3	26.5
Siding
Segment Reporting Information [Line Items]
Net sales	884.0	752.3	636.4
Operating income (loss)	186.8	126.1	93.2
Depreciation and amortization	30.9	27.4	19.7
Payments to Acquire Property, Plant, and Equipment	63.0	49.9	75.7
Engineered Wood Products
Segment Reporting Information [Line Items]
Net sales	365.9	296.9	286.1
Operating income (loss)	14.9	(5.8)	(7.3)
Depreciation and amortization	15.8	12.7	12.6
Payments to Acquire Property, Plant, and Equipment	6.0	5.3	4.1
South America
Segment Reporting Information [Line Items]
Net sales	155.3	136.9	134.9
Operating income (loss)	24.3	17.0	9.8
Depreciation and amortization	9.1	8.6	7.9
Payments to Acquire Property, Plant, and Equipment	17.5	8.7	6.0
Other
Segment Reporting Information [Line Items]
Net sales	30.0	26.9	29.0
Operating income (loss)	(3.4)	(1.6)	(2.8)
Depreciation and amortization	2.8	2.3	1.8
Payments to Acquire Property, Plant, and Equipment	1.0	8.1	1.1
Intersegment sales
Segment Reporting Information [Line Items]
Net sales	(3.8)	(7.3)	(1.4)
Unallocated Amount to Segment
Segment Reporting Information [Line Items]
Depreciation and amortization	3.1	3.2	2.9
Payments to Acquire Property, Plant, and Equipment	$ 2.7	$ 3.5	$ 0.4

Segment Information Identifiable assets (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Assets	$ 2,448.5	$ 2,031.2
OSB
Assets	577.5	555.0
Siding
Assets	371.8	344.1
Engineered Wood Products
Assets	116.3	115.6
South America
Assets	95.9	85.5
Other
Assets	93.7	75.9
Unallocated Amount to Segment
Assets	$ 1,193.3	$ 855.1

Segment Information (Details) - USD ($) $ in Millions	12 Months Ended
Segment Information (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Sales	$ 2,733.9	$ 2,233.4	$ 1,892.5
Operating Income (Loss)	523.4	204.0	(63.3)
Other operating charges and gain loss	(15.0)	(9.0)	(18.0)
unallocated and other than temporary impairment	123.0	(143.0)	(118.0)
Income (loss) from continuing operations before income taxes, extraordinary items, noncontrolling interest	510.2	170.1	(88.7)
Provision (benefit) for income taxes	119.1	19.8	(2.7)
Income (loss) from continuing operations, including portion attributable to noncontrolling interest	391.1	150.3	(86.0)
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	982.0	938.0	916.0
South America
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Sales	155.3	136.9	134.9
Operating Income (Loss)	24.3	17.0	9.8
UNITED STATES
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Sales	2,307.0	1,882.0	1,551.0
Operating Income (Loss)	458.0	235.0	84.0
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	529.0	516.0	506.0
CANADA
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Sales	704.0	682.0	491.0
Operating Income (Loss)	166.0	70.0	(47.0)
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	380.0	365.0	360.0
South America
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Sales	165.0	137.0	135.0
Operating Income (Loss)	24.0	17.0	10.0
Disclosure on Geographic Areas, Long-Lived Assets in Entity's Country of Domicile	73.0	57.0	50.0
Intersegment sales
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total Sales	$ (442.0)	$ (468.0)	$ (285.0)