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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	May 03, 2018
Entity Information [Line Items]
Entity Registrant Name	LOUISIANA-PACIFIC CORP
Entity Central Index Key	0000060519
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		145,177,391

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 895.7	$ 928.0
Receivables, net of allowance for doubtful accounts of $0.9 million at March 31, 2018 and December 31, 2017	149.3	142.5
Inventories	329.4	259.1
Prepaid expenses and other current assets	9.0	7.8
Current portion of notes receivable from asset sales	22.2	22.2
Total current assets	1,405.6	1,359.6
Timber and timberlands	53.9	55.7
Property, plant and equipment, net	932.1	926.1
Goodwill and other intangible assets	26.6	26.7
Investments in and advances to affiliates	8.5	7.8
Restricted cash	13.4	13.3
Other assets	56.6	56.8
Long-term deferred tax asset	2.5	2.5
Total assets	2,499.2	2,448.5
LIABILITIES AND EQUITY
Current portion of long-term debt	25.1	25.1
Accounts payable and accrued liabilities	187.5	237.1
Income taxes payable	21.6	4.5
Current portion of contingency reserves	3.4	3.4
Total current liabilities	237.6	270.1
Long-term debt, excluding current portion	351.1	350.8
Deferred income taxes	39.6	33.4
Contingency reserves, excluding current portion	14.5	11.7
Other long-term liabilities	184.0	178.0
Stockholders' equity:
Common stock, $1 par value, 200,000,000 shares authorized, 153,358,542 shares issued	153.4	153.4
Additional paid-in capital	462.7	470.6
Retained earnings	1,364.4	1,280.1
Treasury stock, 8,181,151 shares and 8,462,949 shares, at cost	(173.2)	(177.5)
Accumulated comprehensive loss	(134.9)	(122.1)
Total stockholders' equity	1,672.4	1,604.5
Total liabilities and stockholders' equity	$ 2,499.2	$ 2,448.5

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts	$ 0.9	$ 0.9

Consolidated Statement of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net sales	$ 691.3	$ 610.9
Operating costs and expenses:
Cost of sales	514.5	482.8
Gross Profit	176.8	128.1
Selling and administrative	50.6	48.7
(Gain) loss on sale or impairment of long lived assets, net	(0.6)	0.6
Other operating credits and charges, net	(0.4)	3.4
Income from operations	127.2	75.4
Non-operating income (expense):
Interest expense, net of capitalized interest	(4.4)	(5.0)
Investment income	3.2	2.0
Other non-operating items	(1.4)	(1.9)
Total non-operating income (expense)	(2.6)	(4.9)
Income from continuing operations before taxes	124.6	70.5
Provision for income taxes	29.7	15.5
Income from continuing operations	94.9	55.0
Loss from discontinued operations before tax	(5.3)	0.0
Benefit for income taxes	(1.3)	0.0
Loss from discontinued operations	(4.0)	0.0
Net income	$ 90.9	$ 55.0
Net income per share of common stock:
Income per share continuing operations	$ 0.66	$ 0.38
Loss per share discontinued operations	(0.03)	0.0
Net income per share - basic	0.63	0.38
Diluted net income per share of common stock
Income per share continuing operations	0.65	0.38
Loss per share discontinued operations	(0.03)	0.00
Net income per share - diluted	$ 0.62	$ 0.38
Weighted average shares of stock outstanding - basic	144.7	144.2
Weighted average shares of stock outstanding - diluted	146.7	145.9

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net income	$ 90.9	$ 55.0
Other comprehensive income (loss)
Foreign currency translation adjustments	2.3	2.8
Unrealized gain on investments, net of tax	0.2	0.3
Defined benefit pension plans:
Amortization of amounts included in net periodic benefit cost, net of tax	1.2	1.1
Other comprehensive income	3.9	4.0
Comprehensive income	94.8	59.0
Actuarial loss, net of tax
Defined benefit pension plans:
Change benefit obligations, translation adjustment	0.2	(0.2)
Amortization of amounts included in net periodic benefit cost, net of tax	1.1	0.9
Other comprehensive income	1.3	0.7
Prior service cost, net of tax
Defined benefit pension plans:
Amortization of amounts included in net periodic benefit cost, net of tax	0.1	0.2
Other comprehensive income	$ 0.1	$ 0.2

Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 90.9	$ 55.0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	31.0	30.6
Equity in income of unconsolidated affiliates, including dividends	(0.8)	(0.6)
(Gain) loss on sale or impairment of long lived assets, net	(0.6)	0.6
Other operating credits and charges, net	(0.4)	3.4
Stock-based compensation related to stock plans	2.2	4.1
Exchange (gain) loss on remeasurement	(0.1)	0.2
Cash settlements of warranties, net of accruals	(0.9)	(3.2)
Loss Contingency Accrual, Provision	4.8	0.0
Pension expense, net of contributions	1.6	1.4
Non-cash interest expense, net	0.8	0.1
Other adjustments, net	0.1	0.3
Increase in receivables	(29.2)	(39.7)
Increase in inventories	(54.0)	(24.8)
Increase in prepaid expenses	(1.2)	(0.6)
Decrease in accounts payable and accrued liabilities	(38.0)	(19.9)
Increase in income taxes	24.5	13.9
Net cash provided by operating activities	30.7	20.8
CASH FLOWS FROM INVESTING ACTIVITIES:
Property, plant, and equipment additions	(43.2)	(26.1)
Proceeds from sales of assets	0.8	0.0
Other investing activities	(0.2)	0.2
Net cash used in investing activities	(42.6)	(25.9)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of long-term debt	(0.1)	(1.2)
Payment of cash dividend	(18.9)	0.0
Sale of common stock, net of cash payments under equity plans	0.1	0.4
Taxes paid related to net share settlement of equity awards	5.7	4.7
Proceeds from (Payments for) Other Financing Activities	3.1	0.0
Net cash used in financing activities	(21.5)	(5.5)
EFFECT OF EXCHANGE RATE ON CASH, CASH EQUIVALENTS AND RESTRICTED CASH	1.2	0.7
Net decrease in cash, cash equivalents and restricted cash	(32.2)	(9.9)
Cash, cash equivalents and restricted cash at beginning of period	941.3	672.5
Cash, cash equivalents and restricted cash at end of period	$ 909.1	$ 662.6

Statement of Shareholders Equity Statement - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Accumulated comprehensive loss	$ (137.2)
Net income	55.0
Dividends paid	0.0
Accumulated comprehensive loss	(133.2)
Common Stock, Shares, Outstanding		153.4
Common Stock, Value, Outstanding		$ 153.4
Treasury Stock, Common, Shares			8.4
Treasury Stock, Value	177.5		$ (177.5)
Additional Paid in Capital, Common Stock	470.6			$ 470.6
Retained earnings	1,280.1				$ 1,280.1
Accumulated comprehensive loss	(122.1)					$ (122.1)
Total stockholders' equity	1,604.5
Effects of adoption of new accounting pronouncements \| Accounting Standards Update 2014-09 [Member]	(4.4)				(4.4)
Effects of adoption of new accounting pronouncements \| Accounting Standards Update 2018-02 [Member]	0.0				16.7	(16.7)
Net income	90.9				90.9
Dividends paid	(18.9)				(18.9)
Issuance of shares for stock plans and stock-based compensation, shares			(0.5)
Issuance of shares for stock plans and stock-based compensation, value	0.0		$ 10.1	(10.1)
Compensation expense associated with stock-based compensation	2.2			2.2
Taxes paid related to net settlement of stock-based awards, shares			0.3
Taxes paid related to net settlement of stock-based awards, value	(5.8)		$ (5.8)
Other comprehensive income	3.9					3.9
Common Stock, Shares, Outstanding		153.4
Common Stock, Value, Outstanding		$ 153.4
Treasury Stock, Common, Shares			8.2
Treasury Stock, Value	173.2		$ (173.2)
Additional Paid in Capital, Common Stock	462.7			$ 462.7
Retained earnings	1,364.4				$ 1,364.4
Retained earnings \| Accounting Standards Update 2014-09 [Member]	(4.4)
Retained earnings \| Accounting Standards Update 2018-02 [Member]	16.7
Accumulated comprehensive loss	(134.9)					$ (134.9)
Accumulated comprehensive loss \| Accounting Standards Update 2014-09 [Member]	0.0
Accumulated comprehensive loss \| Accounting Standards Update 2018-02 [Member]	(16.7)
Total stockholders' equity	$ 1,672.4

Basis For Presentation	3 Months Ended
Basis For Presentation	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis for Presentation	BASIS FOR PRESENTATION The accompanying unaudited consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and, in the opinion of management, include all adjustments (consisting of normal recurring adjustments) necessary to present fairly, in all material respects, the consolidated financial position, results of operations and cash flows of us and our subsidiaries for the interim periods presented. Results of operations for interim periods are not necessarily indicative of results to be expected for an entire year. These consolidated financial statements should be read in conjunction with the consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2017.

Present and Prospective Accounting Pronouncements (Notes)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

New Accounting Pronouncements, Policy [Policy Text Block]

NOTE 2 - NEW ACCOUNTING STANDARDS AND CERTAIN RECLASSIFICATIONS

On January 1, 2018, we adopted ASU 2014-09, "Revenue from Contracts with Customers" (ASC 606), and all the related amendments to all contracts using the modified retrospective method. We recognized the cumulative effect of initially applying the new revenue standard as an adjustment to the opening balance of retained earnings. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. We expect the impact of the adoption of the new revenue standard to be immaterial to our net income on an ongoing basis. Recognition of a portion of our sales revenue has been delayed due to the timing of satisfying the performance obligations. The new revenue standard also provided additional clarity that resulted in reclassifications to or from Net sales and Selling, general and administrative expenses.

On January 1, 2018, we adopted ASU 2018-02, “Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” The guidance allows us to reclassify the stranded tax effects within Accumulated other comprehensive income to Retained earnings in each period in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Cuts and Jobs Act is recorded.

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



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

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

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



	Quarter Ended March 31, 2018
Dollar amounts in millions	As reported		Balances without adoption of ASC 606		Effect of Change Higher (Lower)
Consolidated Statement of Income
Net sales	$	691.3	$	702.4	$	(11.1	)
Cost of sales	514.5		521.0		(6.5		)
Selling, general and administrative expenses	50.6		51.4		(0.8		)
Provision for income taxes	29.7		30.6		(0.9		)
Net income	90.9		93.8		(2.9		)

Consolidated Balance Sheet
Receivables, net of allowance for doubtful accounts	149.3		181.3		(32.0		)
Inventory	329.4		307.1		22.3
Income taxes payable	21.6		22.5		(0.9		)
Retained earnings	1,364.4		1,367.3		(2.9		)

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

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



	Quarter Ended March 31, 2017
Dollar amounts in millions	As reported			ASU 2017-07			Reclassifications			As adjusted
Consolidated Statement of Income
Cost of sales (exclusive of depreciation and amortization shown separately below)	$	453.9		$	(1.0	)	$	29.9		$	482.8
Depreciation and amortization	30.6			—			(30.6		)	—
Selling, general and administrative expenses	48.6			(0.6		)	0.7			48.7
Income from operations	73.8			1.6			—			75.4

Total non-operating income (expense)	(3.3		)	(1.6		)	—			(4.9		)

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

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



	Quarter Ended March 31, 2017
Dollar amounts in millions	As reported			ASU 2016-18		As adjusted
Consolidated Statement of Cash Flows
Net cash provided by (used in) investing activities	$	(26.0	)	0.1		$	(25.9	)
Effect of exchange rate on cash, cash equivalents and restricted cash	$	0.9		(0.2	)	$	0.7
Net decrease in cash, cash equivalents and restricted cash	$	(9.8	)	(0.1	)	$	(9.9	)
Cash, cash equivalents and restricted cash at beginning of period	$	659.3		13.2		$	672.5
Cash, cash equivalents and restricted cash at end of period	$	649.5		13.1		$	662.6

Stock-Based Compensation

3 Months Ended

Mar. 31, 2018

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

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

STOCK-BASED COMPENSATION

We have a Management Incentive Plan (MIP) that is administered by the Compensation Committee of the Board of Directors. The Compensation Committee authorizes the grants of restricted stock (shares or units), performance share awards payable in stock based upon the attainment of specified performance goals and stock settled stock appreciation rights (SSARs). As of March 31, 2018, 2.4 million shares were available for grant under the 2013 Omnibus Plan.



	Quarter Ended March 31,
Dollar amounts in millions	2018			2017
Total stock-based compensation expense (cost of sales and general and administrative)	$	2.2		$	4.1
Income tax provision (benefit) related to stock-based compensation	$	(2.2	)	$	—
Impact on cash flow due to taxes paid related to net share settlement of equity awards	$	5.7		$	4.7

At March 31, 2018, $20.0 million of compensation cost related to unvested performance shares, restricted stock and SSARs attributable to future service had not yet been recognized.

Grants of awards

During the first three months of 2018, we granted 164,546 performance units at an average grant date fair value of $29.31 per share and 281,752 restricted stock awards (shares or units) at an average grant date fair value of $26.72 per share.

Fair Value Measurements	3 Months Ended
Fair Value Measurements	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Text Block]	FAIR VALUE MEASUREMENTS We estimated our Senior Notes due in 2024 to have a fair value of $350.9 million at March 31, 2018 and $363.9 million at December 31, 2017 based upon market quotations. Carrying amounts reported on the balance sheet for cash and cash equivalents, accounts receivables, current portion notes receivable from asset sales, accounts payable and current portion of limited recourse notes payable approximate fair value due to the short-term maturity of these items.

- 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

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings per Share

EARNINGS PER SHARE

Basic earnings per share are based upon 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. Our potentially dilutive securities consist of restricted stock, restricted stock units, performance share awards and SSARs.



Share amounts in millions	Quarter Ended March 31,
Share amounts in millions	2018	2017
Denominator for basic earnings per share:
Weighted average common shares outstanding - basic	144.7	144.2
Effect of dilutive securities:
Dilutive effect of employee stock plans	2.0	1.7
Denominator for diluted earnings per share:
Weighted average shares outstanding - diluted	146.7	145.9

For the quarter ended March 31, 2018, there were no restricted stock (shares or units), performance share awards and SSARs that were considered not in-the-money for purposes of our earnings per share calculation.

For the quarter ended March 31, 2017, restricted stock (shares or units), performance share awards and SSARs relating to approximately 0.6 million shares of our common stock were considered not in-the-money for purposes of our earnings per share calculation.

Receivables

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Receivables

RECEIVABLES

Receivables consist of the following:



Dollar amounts in millions	March 31, 2018			December 31, 2017
Trade receivables	$	132.3		$	124.6
Income tax receivable	1.9			2.2
Other receivables	16.0			16.6
Allowance for doubtful accounts	(0.9		)	(0.9		)
Total	$	149.3		$	142.5

Other receivables at March 31, 2018 and December 31, 2017 primarily consist of sales tax receivables, vendor rebates, interest receivables, a receivable associated with an affiliate, receivables for tax credits 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

Inventories

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Inventories

INVENTORIES

Inventories are valued at the lower of cost or net realizable value. Inventory cost includes materials, labor and operating overhead. The major types of inventories are as follows (work in process is not material):



Dollar amounts in millions	March 31, 2018		December 31, 2017
Logs	$	88.1	$	60.3
Other raw materials	24.0		20.8
Semi-finished inventory	22.1		24.3
Finished products	195.2		153.7
Total	$	329.4	$	259.1

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES Accounting standards state that companies account for income taxes using the asset and liability approach, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the carrying amounts and the tax basis of assets and liabilities. This method also requires the recognition of future tax benefits, such as net operating loss carryforwards and other tax credits. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to reverse. Valuation allowances are recorded as necessary to reduce deferred tax assets to the amount thereof that is more likely than not to be realized. The likelihood of realizing deferred tax assets is evaluated by, among other things, estimating future taxable income, considering the future reversal of existing deferred tax liabilities to which the deferred tax assets may be applied and assessing the impact of tax planning strategies. For interim periods, accounting standards require that income tax expense be determined by applying the estimated annual effective income tax rate to year-to-date results unless this method does not result in a reliable estimate of year-to-date income tax expense. Each period, the income tax accrual is adjusted to the latest estimate and the difference from the previously accrued year-to-date balance is adjusted to the current quarter. Changes in the profitability estimates in various jurisdictions will impact our quarterly effective income tax rates. For the first three months of 2018, the primary differences between the U.S. statutory rate of 21% and the effective rate applicable to our income relate to state income tax, foreign tax rates and tax deductions related to stock-based compensation. For the first three months of 2017, the primary differences between the U.S. statutory rate of 35% and the effective rate applicable to our continuing operations relate to foreign tax rates, changes in Canadian valuation allowances, and recognition of research and development tax credits from prior years. We periodically review the need for valuation allowances against deferred tax assets and recognize these deferred tax assets to the extent that the 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 in future periods our earnings estimates 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.

Other Operating Credits and Charges, Net	3 Months Ended
Other Operating Credits and Charges, Net	Mar. 31, 2018
Other Operating Credits And Charges, Net [Abstract]
Other Operating Credits and Charges Net [Table Text Block]	OTHER OPERATING CREDITS AND CHARGES During the first quarter of 2018, we recorded a gain of $0.4 million related to a previously-settled claim associated with our hardboard siding. During the first quarter of 2017, we recorded an expense of $3.4 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.

Legal and Environmental Matters	3 Months Ended
Legal and Environmental Matters	Mar. 31, 2018
Legal and Environmental Matters [Abstract]
Legal and Environmental Matters	LEGAL AND ENVIRONMENTAL MATTERS Certain environmental matters and legal proceedings are discussed below. Environmental Matters 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. Other Proceedings LP and its subsidiaries are parties to other legal proceedings. 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.

Selected Segment Data

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Selected Segment Data

SELECTED SEGMENT DATA

We operate in four segments: Siding, North America Oriented Strand Board (OSB), Engineered Wood Products (EWP) and South America. Our business units have been aggregated into these four segments based upon the similarity of economic characteristics, customers and distribution methods. Our results of operations are summarized below for each of these segments separately as well as for the “other” category which comprises other products that are not individually significant. Segment information was prepared in accordance with the same accounting principles as those described in Note 1 of the Notes to the financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2017.



	Quarter Ended March 31,
Dollar amounts in millions	2018			2017
Net Sales
Siding	$	227.0		$	214.0
OSB	313.3			268.4
EWP	100.7			82.1
South America	42.4			37.8
Other	7.9			8.7
Intersegment sales	—			(0.1		)
	$	691.3		$	610.9
Operating profit (loss):
Siding	$	45.3		$	40.7
OSB	97.4			60.8
EWP	2.8			0.8
South America	8.9			5.1
Other	(0.9		)	(0.2		)
Other operating credits and charges, net	0.4			(3.4		)
Gain (loss) on sale or impairment of long-lived assets, net	0.6			(0.6		)
General corporate and other expenses, net	(27.3		)	(27.8		)
Interest expense, net of capitalized interest	(4.4		)	(5.0		)
Investment income	3.2			2.0
Other non-operating items	(1.4		)	(1.9		)
Income before taxes	124.6			70.5
Provision for income taxes	29.7			15.5
Income from continuing operations	$	94.9		$	55.0

Potential Impairments	3 Months Ended
Potential Impairments	Mar. 31, 2018
Asset Impairment Charges [Abstract]
Potential Impairments	POTENTIAL IMPAIRMENTS We continue to review certain operations and investments for potential impairments. We currently believe 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. We also review from time to time possible dispositions of various assets in light of current and anticipated economic and industry conditions, its strategic plan and other relevant circumstances. Because a determination to dispose of particular assets can require management to make assumptions regarding the transaction structure of the disposition and to estimate the net sales proceeds, which may be less than previous estimates of undiscounted future net cash flows, we may be required to record impairment charges in connection with decisions to dispose of assets.

Defined Benefit Pension Plans

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Compensation and Employee Benefit Plans

DEFINED BENEFIT PENSION PLANS

The following table sets forth the net periodic pension cost for our defined benefit pension and postretirement plans during the quarter ended March 31, 2018 and 2017. In accordance with ASU 2017-07, "Retirement Benefits - Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost" (an amendment to ASC 715), all non-service related costs associated with our pension and post retirement plans are recorded outside of operating income. The net periodic pension cost included the following components:



	Quarter Ended March 31,
Dollar amounts in millions	2018			2017
Service cost	$	1.1		$	1.4
Other components of net periodic pension cost:
Interest cost	2.9			3.2
Expected return on plan assets	(3.4		)	(3.3		)
Amortization of prior service cost ¹	0.1			0.2
Amortization of net loss ¹	1.6			1.4
Net periodic pension cost	$	2.3		$	2.9

Net periodic pension cost included in cost of sales	$	0.7		$	0.9
Net periodic pension cost included in selling, general, and administrative expenses	0.4			0.4
Net periodic pension cost included in other non-operating items	1.2			1.6
	$	2.3		$	2.9

¹The amortization of prior service costs and net loss are included in the amounts reclassified from accumulated other comprehensive income (loss). See Note 16 for additional details.

During the three months ended March 31, 2018, we made $0.7 million in pension contributions to our defined benefit pension plans. We expect to contribute between $10.0 million and $12.0 million to our defined benefit pension plans in the remaining months of 2018.

Product Warranty

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Guarantees and Indemnifications

We provide warranties on the sale of most of our products and records 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 quarter ended March 31, 2018 and 2017 are summarized in the following table:



	Quarter Ended March 31,
Dollar amounts in millions	2018			2017
Beginning balance	$	24.7		$	24.1
Accrued to expense	0.2			0.2
Accrued to other operating credits and charges	—			3.4
Foreign currency translation	0.4			0.2
Payments made	(1.1		)	(3.4		)
Total warranty reserves	24.2			24.5
Current portion of warranty reserves	(9.0		)	(9.0		)
Long-term portion of warranty reserves	$	15.2		$	15.5

We continue to monitor warranty and other claims associated with these products and believe as of March 31, 2018 that the reserves associated with these matters are adequate. However, it is possible that additional charges may be required in the future.

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

Other Comprehensive Income Other Comprehensive Income

3 Months Ended

Mar. 31, 2018

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

Comprehensive Income (Loss) Note [Text Block]

NOTE 16 - OTHER COMPREHENSIVE INCOME

Other comprehensive income activity, net of tax, is provided in the following table for the quarter ended March 31, 2018:



				Pension Adjustments
Dollar amounts in millions	Foreign currency translation adjustments			Actuarial losses			Prior service costs			Unrealized gain (loss) on investments		Other			Total
Balance at December 31, 2017	$	(39.7	)	$	(79.5	)	$	(4.9	)	$	3.5	$	(1.5	)	$	(122.1	)
Effect of adoption of ASU 2018-02	—			(17.4		)	—			0.7		—			(16.7		)
Other comprehensive income before reclassifications	2.3			0.2			—			0.2					2.7
Income taxes	—			—			—					—			—
Net other comprehensive income before reclassifications	2.3			0.2			—			0.2		—			2.7
Amounts reclassified from accumulated comprehensive income	—			1.5			0.1			—		—			1.6
Income taxes	—			(0.4		)	—			—		—			(0.4		)
Net amounts reclassified from cumulative other comprehensive income	—			1.1			0.1			—		—			1.2
Total other comprehensive income	2.3			1.3			0.1			0.2		—			3.9
Balance at March 31, 2018	$	(37.4	)	$	(95.6	)	$	(4.8	)	$	4.4	$	(1.5	)	$	(134.9	)

Other comprehensive income activity, net of tax, is provided in the following table for the quarter ended March 31, 2017:



				Pension Adjustments
Dollar amounts in millions	Foreign currency translation adjustments			Actuarial losses			Prior service costs			Unrealized gain (loss) on investments			Other			Total
Balance at December 31, 2016	$	(46.3	)	$	(87.7	)	$	(5.2	)	$	2.7		$	(0.7	)	$	(137.2	)
Other comprehensive income (loss) before reclassifications	2.8			(0.2		)	—			0.5			—			3.1
Income taxes	—			—			—			(0.2		)	—			(0.2		)
Net other comprehensive income (loss) before reclassifications	2.8			(0.2		)	—			0.3			—			2.9
Amounts reclassified from accumulated other comprehensive income	—			1.4			0.3			—			—			1.7
Income taxes	—			(0.5		)	(0.1		)	—			—			(0.6		)
Net amounts reclassified from cumulative other comprehensive income	—			0.9			0.2			—			—			1.1
Total other comprehensive income	2.8			0.7			0.2			0.3			—			4.0
Balance at March 31, 2017	$	(43.5	)	$	(87.0	)	$	(5.0	)	$	3.0		$	(0.7	)	$	(133.2	)

The amounts reclassified from accumulated other comprehensive income (loss) are included in the computation of net periodic pension cost; see Note 14 for additional details. The net periodic pension cost is included in the captions "Cost of sales", "Selling, general and administrative expenses" and "Other non-operating items" in the Consolidated Statements of Income.

Present and Prospective Accounting Pronouncements Cumulative Effect of Adoption (Tables)

3 Months Ended

Mar. 31, 2018

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

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



	Quarter Ended March 31, 2017
Dollar amounts in millions	As reported			ASU 2017-07			Reclassifications			As adjusted
Consolidated Statement of Income
Cost of sales (exclusive of depreciation and amortization shown separately below)	$	453.9		$	(1.0	)	$	29.9		$	482.8
Depreciation and amortization	30.6			—			(30.6		)	—
Selling, general and administrative expenses	48.6			(0.6		)	0.7			48.7
Income from operations	73.8			1.6			—			75.4

Total non-operating income (expense)	(3.3		)	(1.6		)	—			(4.9		)

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



	Quarter Ended March 31, 2018
Dollar amounts in millions	As reported		Balances without adoption of ASC 606		Effect of Change Higher (Lower)
Consolidated Statement of Income
Net sales	$	691.3	$	702.4	$	(11.1	)
Cost of sales	514.5		521.0		(6.5		)
Selling, general and administrative expenses	50.6		51.4		(0.8		)
Provision for income taxes	29.7		30.6		(0.9		)
Net income	90.9		93.8		(2.9		)

Consolidated Balance Sheet
Receivables, net of allowance for doubtful accounts	149.3		181.3		(32.0		)
Inventory	329.4		307.1		22.3
Income taxes payable	21.6		22.5		(0.9		)
Retained earnings	1,364.4		1,367.3		(2.9		)

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



	Quarter Ended March 31, 2017
Dollar amounts in millions	As reported			ASU 2016-18		As adjusted
Consolidated Statement of Cash Flows
Net cash provided by (used in) investing activities	$	(26.0	)	0.1		$	(25.9	)
Effect of exchange rate on cash, cash equivalents and restricted cash	$	0.9		(0.2	)	$	0.7
Net decrease in cash, cash equivalents and restricted cash	$	(9.8	)	(0.1	)	$	(9.9	)
Cash, cash equivalents and restricted cash at beginning of period	$	659.3		13.2		$	672.5
Cash, cash equivalents and restricted cash at end of period	$	649.5		13.1		$	662.6

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



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

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

Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Disaggregation of Revenue [Line Items]

Disaggregation of Revenue [Table Text Block]

The following tables disaggregate our revenue by product line and product type by segment for the quarters ended March 31, 2018 and March 31, 2017:



Quarter Ended March 31, 2018
By Product family:	Siding		OSB		EWP		South America		Other		Inter-segment		Total
SmartSide^® Strand siding	$	165.1	$	—	$	—	$	6.8	$	—	$	—	$	171.9
SmartSide^® Fiber siding	25.9		—		—		—		—		—		25.9
CanExel^® siding	13.9		—		—		—		—		—		13.9
OSB - commodity	8.7		181.1		2.8		—		—		—		192.6
OSB - value-add	9.2		129.1		4.1		34.9		—		—		177.3
LVL	—		—		36.6		—		—		—		36.6
LSL	—		—		13.3		—		—		—		13.3
I-joist	—		—		32.1		—		—		—		32.1
Plywood	—		—		7.6		—		—		—		7.6
Other	4.2		3.1		4.2		0.7		7.9		—		20.1
	$	227.0	$	313.3	$	100.7	$	42.4	$	7.9	$	—	$	691.3
By Product type:
Commodity	$	8.7	$	181.1	$	10.4	$	—	$	—	$	—	$	200.2
Value-add	214.1		129.1		86.1		41.7		—		—		471.0
Other	4.2		3.1		4.2		0.7		7.9		—		20.1
	$	227.0	$	313.3	$	100.7	$	42.4	$	7.9	$	—	$	691.3



Quarter Ended March 31, 2017
By Product family:	Siding		OSB		EWP		South America		Other		Inter-segment			Total
SmartSide^® Strand siding	$	156.1	$	—	$	—	$	6.2	$	—	$	—		$	162.3
SmartSide^® Fiber siding	28.7		—		—		—		—		—			28.7
CanExel^® siding	14.3		—		—		—		—		—			14.3
OSB - commodity	12.4		151.3		1.1		—		—		—			164.8
OSB - value-add	—		113.1		2.9		30.6		—		—			146.6
LVL	—		—		33.0		—		—		—			33.0
LSL	—		—		10.6		—		—		—			10.6
I-joist	—		—		25.7		—		—		—			25.7
Plywood	—		—		4.8		—		—		—			4.8
Other	2.5		4.0		4.0		1.0		8.7		(0.1		)	20.1
	$	214.0	$	268.4	$	82.1	$	37.8	$	8.7	$	(0.1	)	$	610.9
By Product type:
Commodity	$	12.4	$	151.3	$	5.9	$	—	$	—	$	—		$	169.6
Value-add	199.1		113.1		72.2		36.8		—		—			421.2
Other	2.5		4.0		4.0		1.0		8.7		(0.1		)	20.1
	$	214.0	$	268.4	$	82.1	$	37.8	$	8.7	$	(0.1	)	$	610.9

Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

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

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



	Quarter Ended March 31,
Dollar amounts in millions	2018			2017
Total stock-based compensation expense (cost of sales and general and administrative)	$	2.2		$	4.1
Income tax provision (benefit) related to stock-based compensation	$	(2.2	)	$	—
Impact on cash flow due to taxes paid related to net share settlement of equity awards	$	5.7		$	4.7

Earnings per Share (Tables) (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

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



Share amounts in millions	Quarter Ended March 31,
Share amounts in millions	2018	2017
Denominator for basic earnings per share:
Weighted average common shares outstanding - basic	144.7	144.2
Effect of dilutive securities:
Dilutive effect of employee stock plans	2.0	1.7
Denominator for diluted earnings per share:
Weighted average shares outstanding - diluted	146.7	145.9

Receivables (Tables)

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

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

Receivables consist of the following:



Dollar amounts in millions	March 31, 2018			December 31, 2017
Trade receivables	$	132.3		$	124.6
Income tax receivable	1.9			2.2
Other receivables	16.0			16.6
Allowance for doubtful accounts	(0.9		)	(0.9		)
Total	$	149.3		$	142.5

Inventories (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

The major types of inventories are as follows (work in process is not material):



Dollar amounts in millions	March 31, 2018		December 31, 2017
Logs	$	88.1	$	60.3
Other raw materials	24.0		20.8
Semi-finished inventory	22.1		24.3
Finished products	195.2		153.7
Total	$	329.4	$	259.1

Selected Segment Data (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

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



	Quarter Ended March 31,
Dollar amounts in millions	2018			2017
Net Sales
Siding	$	227.0		$	214.0
OSB	313.3			268.4
EWP	100.7			82.1
South America	42.4			37.8
Other	7.9			8.7
Intersegment sales	—			(0.1		)
	$	691.3		$	610.9
Operating profit (loss):
Siding	$	45.3		$	40.7
OSB	97.4			60.8
EWP	2.8			0.8
South America	8.9			5.1
Other	(0.9		)	(0.2		)
Other operating credits and charges, net	0.4			(3.4		)
Gain (loss) on sale or impairment of long-lived assets, net	0.6			(0.6		)
General corporate and other expenses, net	(27.3		)	(27.8		)
Interest expense, net of capitalized interest	(4.4		)	(5.0		)
Investment income	3.2			2.0
Other non-operating items	(1.4		)	(1.9		)
Income before taxes	124.6			70.5
Provision for income taxes	29.7			15.5
Income from continuing operations	$	94.9		$	55.0

Defined Benefit Pension Plans (Tables)

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

The net periodic pension cost included the following components:



	Quarter Ended March 31,
Dollar amounts in millions	2018			2017
Service cost	$	1.1		$	1.4
Other components of net periodic pension cost:
Interest cost	2.9			3.2
Expected return on plan assets	(3.4		)	(3.3		)
Amortization of prior service cost ¹	0.1			0.2
Amortization of net loss ¹	1.6			1.4
Net periodic pension cost	$	2.3		$	2.9

Net periodic pension cost included in cost of sales	$	0.7		$	0.9
Net periodic pension cost included in selling, general, and administrative expenses	0.4			0.4
Net periodic pension cost included in other non-operating items	1.2			1.6
	$	2.3		$	2.9

Product Warranty (Tables)

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

The activity in warranty reserves for the quarter ended March 31, 2018 and 2017 are summarized in the following table:



	Quarter Ended March 31,
Dollar amounts in millions	2018			2017
Beginning balance	$	24.7		$	24.1
Accrued to expense	0.2			0.2
Accrued to other operating credits and charges	—			3.4
Foreign currency translation	0.4			0.2
Payments made	(1.1		)	(3.4		)
Total warranty reserves	24.2			24.5
Current portion of warranty reserves	(9.0		)	(9.0		)
Long-term portion of warranty reserves	$	15.2		$	15.5

Other Comprehensive Income Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2018

Accumulated Other Comprehensive Income (Loss) [Line Items]

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



				Pension Adjustments
Dollar amounts in millions	Foreign currency translation adjustments			Actuarial losses			Prior service costs			Unrealized gain (loss) on investments		Other			Total
Balance at December 31, 2017	$	(39.7	)	$	(79.5	)	$	(4.9	)	$	3.5	$	(1.5	)	$	(122.1	)
Effect of adoption of ASU 2018-02	—			(17.4		)	—			0.7		—			(16.7		)
Other comprehensive income before reclassifications	2.3			0.2			—			0.2					2.7
Income taxes	—			—			—					—			—
Net other comprehensive income before reclassifications	2.3			0.2			—			0.2		—			2.7
Amounts reclassified from accumulated comprehensive income	—			1.5			0.1			—		—			1.6
Income taxes	—			(0.4		)	—			—		—			(0.4		)
Net amounts reclassified from cumulative other comprehensive income	—			1.1			0.1			—		—			1.2
Total other comprehensive income	2.3			1.3			0.1			0.2		—			3.9
Balance at March 31, 2018	$	(37.4	)	$	(95.6	)	$	(4.8	)	$	4.4	$	(1.5	)	$	(134.9	)

Other comprehensive income activity, net of tax, is provided in the following table for the quarter ended March 31, 2017:



				Pension Adjustments
Dollar amounts in millions	Foreign currency translation adjustments			Actuarial losses			Prior service costs			Unrealized gain (loss) on investments			Other			Total
Balance at December 31, 2016	$	(46.3	)	$	(87.7	)	$	(5.2	)	$	2.7		$	(0.7	)	$	(137.2	)
Other comprehensive income (loss) before reclassifications	2.8			(0.2		)	—			0.5			—			3.1
Income taxes	—			—			—			(0.2		)	—			(0.2		)
Net other comprehensive income (loss) before reclassifications	2.8			(0.2		)	—			0.3			—			2.9
Amounts reclassified from accumulated other comprehensive income	—			1.4			0.3			—			—			1.7
Income taxes	—			(0.5		)	(0.1		)	—			—			(0.6		)
Net amounts reclassified from cumulative other comprehensive income	—			0.9			0.2			—			—			1.1
Total other comprehensive income	2.8			0.7			0.2			0.3			—			4.0
Balance at March 31, 2017	$	(43.5	)	$	(87.0	)	$	(5.0	)	$	3.0		$	(0.7	)	$	(133.2	)

Present and Prospective Accounting Pronouncements Present and Prospective Accounting Pronouncements - Cumulative Effect of changes due to adoption of ASU 2014-09 and 2018-02 (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables, net of allowance of doubtful accounts	$ 149.3	$ 142.5
Inventories	329.4	259.1
Deferred tax asset	2.5	2.5
Retained earnings	1,364.4	1,280.1
Accumulated comprehensive loss	(134.9)	$ (122.1)	$ (133.2)	$ (137.2)
Balance upon adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables, net of allowance of doubtful accounts	120.8
Inventories	274.9
Deferred tax asset	4.0
Retained earnings	1,292.4
Accumulated comprehensive loss	(138.8)
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables, net of allowance of doubtful accounts	(21.7)
Inventories	15.8
Deferred tax asset	1.5
Retained earnings	(4.4)
Accumulated comprehensive loss	0.0
Accounting Standards Update 2018-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables, net of allowance of doubtful accounts	0.0
Inventories	0.0
Deferred tax asset	0.0
Retained earnings	16.7
Accumulated comprehensive loss	$ (16.7)

Present and Prospective Accounting Pronouncements Effect of change related to ASU 2014-09 (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	$ 691.3	$ 610.9
Cost of sales	514.5	482.8
Selling, general and administrative expense	50.6	48.7
Provision for income taxes	29.7	15.5
Net income	90.9	$ 55.0
Receivables, net of allowance of doubtful accounts	149.3		$ 142.5
Inventories	329.4		259.1
Income taxes payable	21.6		4.5
Retained earnings	1,364.4		$ 1,280.1
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables, net of allowance of doubtful accounts	(21.7)
Inventories	15.8
Retained earnings	(4.4)
Accounting Standards Update 2014-09 [Member] \| Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	702.4
Cost of sales	521.0
Selling, general and administrative expense	51.4
Provision for income taxes	30.6
Net income	93.8
Receivables, net of allowance of doubtful accounts	181.3
Inventories	307.1
Income taxes payable	22.5
Retained earnings	1,367.3
Accounting Standards Update 2014-09 [Member] \| Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	(11.1)
Cost of sales	(6.5)
Selling, general and administrative expense	(0.8)
Provision for income taxes	(0.9)
Net income	(2.9)
Receivables, net of allowance of doubtful accounts	(32.0)
Inventories	22.3
Income taxes payable	(0.9)
Retained earnings	$ (2.9)

Present and Prospective Accounting Pronouncements Effect of change related to ASU 2017-07 and other reclassifications (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales	$ 514.5	$ 482.8
Depreciation and amortization	31.0	30.6
Selling, general and administrative expense	50.6	48.7
Income from operations	127.2	75.4
Total non-operating income (expense)	$ (2.6)	(4.9)
Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales (exclusive of depreciation and amortization shown separately below)		453.9
Depreciation and amortization		30.6
Selling, general and administrative expense		48.6
Income from operations		73.8
Total non-operating income (expense)		(3.3)
Reclassifications other than adoptions [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Depreciation and amortization		0.0
Reclassifications other than adoptions [Member] \| Scenario, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales		29.9
Depreciation and amortization		(30.6)
Selling, general and administrative expense		0.7
Income from operations		0.0
Total non-operating income (expense)		0.0
Accounting Standards Update 2017-07 [Member] \| Scenario, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales		(1.0)
Depreciation and amortization		0.0
Selling, general and administrative expense		(0.6)
Income from operations		1.6
Total non-operating income (expense)		$ (1.6)

Present and Prospective Accounting Pronouncements Effect of change related to ASU 2016-18 (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash used in investing activities	$ (42.6)	$ (25.9)
Effect of exchange rate on cash, cash equivalents and restricted cash	1.2	0.7
Net decrease in cash, cash equivalents and restricted cash		(9.9)
Cash, cash equivalents and restricted cash at beginning of period	941.3	672.5
Cash, cash equivalents and restricted cash at end of period	$ 909.1	662.6
Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash used in investing activities		(26.0)
Effect of exchange rate on cash, cash equivalents and restricted cash		0.9
Net decrease in cash, cash equivalents and restricted cash		(9.8)
Cash, cash equivalents and restricted cash at beginning of period		659.3
Cash, cash equivalents and restricted cash at end of period		649.5
Accounting Standards Update 2017-07 [Member] \| Scenario, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash used in investing activities		0.1
Effect of exchange rate on cash, cash equivalents and restricted cash		(0.2)
Net decrease in cash, cash equivalents and restricted cash		(0.1)
Cash, cash equivalents and restricted cash at beginning of period		13.2
Cash, cash equivalents and restricted cash at end of period		$ 13.1

Stock-Based Compensation (Details) - USD ($)	3 Months Ended
Stock-Based Compensation (Details) - USD ($)	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (costs of sales and general and administrative)	$ 2,200,000	$ 4,100,000
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	(2,200,000.0)	0.0
Impact on cash flow due to taxes paid related to net share settlement of equity awards	$ 5,700,000	$ 4,700,000

Stock-Based Compensation Narrative (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant under the 2013 Omnibus Plan	2,400,000
Compensation cost related to unvested awards, not yet recognized \| $	$ 20.0
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in period	164,546
Weighted Average Grant Date Fair Value, Other than options \| $ / shares	$ 29.31
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in period	281,752
Weighted Average Grant Date Fair Value, Other than options \| $ / shares	$ 26.72

Fair Value Measurements (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes due 2024, Fair Value Disclosure	$ 350.9	$ 363.9

Earnings per Share (Details) - shares shares in Millions	3 Months Ended
Earnings per Share (Details) - shares shares in Millions	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Weighted average common shares outstanding - basic	144.7	144.2
Dilutive effect of employee stock plans	2.0	1.7
Weighted average shares outstanding - diluted	146.7	145.9

Earnings per Share Narrative (Details) - shares shares in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.0	0.6

Receivables (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Trade receivables	$ 132.3	$ 124.6
Income tax receivable	1.9	2.2
Other receivables	16.0	16.6
Allowance for doubtful accounts	(0.9)	(0.9)
Total	$ 149.3	$ 142.5

Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Inventory [Line Items]
Logs	$ 88.1	$ 60.3
Other raw materials	24.0	20.8
Semi-finished inventory	22.1	24.3
Finished products	195.2	153.7
Total	$ 329.4	$ 259.1

Income Taxes (Details)	3 Months Ended
Income Taxes (Details)	Mar. 31, 2018	Mar. 31, 2017
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	21.00%	35.00%

Other Operating Credits and Charges, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Operating Credits And Charges, Net [Abstract]
Gain related to previously-settled claim	$ (0.4)	$ 3.4
Expense related to increase in product-related warranty reserves	$ 0.0	$ 3.4

Selected Segment Data (Details) - USD ($) $ in Millions	3 Months Ended
Selected Segment Data (Details) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Net sales:	$ 691.3	$ 610.9
Operating profit (loss):	127.2	75.4
Other operating credits and charges, net	0.4	(3.4)
Gain (loss) on sale or impairment of long-lived assets, net	0.6	(0.6)
General corporate and other expenses, net	(27.3)	(27.8)
Interest expense, net of capitalized interest	(4.4)	(5.0)
Investment income	3.2	2.0
Other non-operating items	(1.4)	(1.9)
Income before taxes	124.6	70.5
Provision for income taxes	29.7	15.5
Income from continuing operations	94.9	55.0
Siding [Member]
Segment Reporting Information [Line Items]
Net sales:	227.0	214.0
Operating profit (loss):	45.3	40.7
OSB [Member]
Segment Reporting Information [Line Items]
Net sales:	313.3	268.4
Operating profit (loss):	97.4	60.8
EWP [Member]
Segment Reporting Information [Line Items]
Net sales:	100.7	82.1
Operating profit (loss):	2.8	0.8
South America [Member]
Segment Reporting Information [Line Items]
Net sales:	42.4	37.8
Operating profit (loss):	8.9	5.1
Other [Member]
Segment Reporting Information [Line Items]
Net sales:	7.9	8.7
Operating profit (loss):	(0.9)	(0.2)
Intersegment [Member]
Segment Reporting Information [Line Items]
Net sales:	$ 0.0	$ (0.1)

Defined Benefit Pension Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2018
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 1.1	$ 1.4
Interest cost	2.9	3.2
Expected return on plan assets	(3.4)	(3.3)
Amortization of prior service cost 1	0.1	0.2
Amortization of net loss 1	1.6	1.4
Net periodic pension cost	2.3	2.9
Net periodic pension cost included in cost of sales	0.7	0.9
Net periodic pension cost included in selling, general, and administrative expenses	0.4	0.4
Net periodic pension cost included in other non-operating items	1.2	$ 1.6
Pension Contributions	$ 0.7
Minimum [Member] \| Scenario, Forecast [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year			$ 10.0
Maximum [Member] \| Scenario, Forecast [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year			$ 12.0

Product Warranty (Details) - USD ($) $ in Millions	3 Months Ended
Product Warranty (Details) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Beginning Balance	$ 24.7	$ 24.1
Accrued to expense	0.2	0.2
Accrued to other operating credits and charges	0.0	3.4
Foreign currency translation	0.4	0.2
Payments made	(1.1)	(3.4)
Total warranty reserves	24.2	24.5
Current portion of warranty reserves	(9.0)	(9.0)
Long-term portion of warranty reserves	$ 15.2	$ 15.5

Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Beginning Balance	$ (122.1)	$ (137.2)
Other comprehensive income (loss) before reclassifications	2.7	3.1
Income taxes	0.0	(0.2)
Net other comprehensive income (loss) before reclassifications	2.7	2.9
Amounts reclassified from accumulated other comprehensive income (loss)	1.6	1.7
Income taxes	(0.4)	(0.6)
Net amounts reclassified from cumulative other comprehensive income (loss)	1.2	1.1
Total other comprehensive income (loss)	3.9	4.0
Ending Balance	(134.9)	(133.2)
Foreign currency translation adjustments
Beginning Balance	(39.7)	(46.3)
Other comprehensive income (loss) before reclassifications	2.3	2.8
Income taxes	0.0	0.0
Net other comprehensive income (loss) before reclassifications	2.3	2.8
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0
Income taxes	0.0	0.0
Net amounts reclassified from cumulative other comprehensive income (loss)	0.0	0.0
Total other comprehensive income (loss)	2.3	2.8
Ending Balance	(37.4)	(43.5)
Actuarial loss, net of tax
Beginning Balance	(79.5)	(87.7)
Other comprehensive income (loss) before reclassifications		(0.2)
Change benefit obligations, translation adjustment	0.2	(0.2)
Income taxes	0.0	0.0
Net other comprehensive income (loss) before reclassifications	0.2	(0.2)
Amounts reclassified from accumulated other comprehensive income (loss)	1.5	1.4
Income taxes	(0.4)	(0.5)
Net amounts reclassified from cumulative other comprehensive income (loss)	1.1	0.9
Total other comprehensive income (loss)	1.3	0.7
Ending Balance	(95.6)	(87.0)
Prior service cost, net of tax
Beginning Balance	(4.9)	(5.2)
Other comprehensive income (loss) before reclassifications	0.0	0.0
Income taxes	0.0	0.0
Net other comprehensive income (loss) before reclassifications	0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss)	0.1	0.3
Income taxes	0.0	(0.1)
Net amounts reclassified from cumulative other comprehensive income (loss)	0.1	0.2
Total other comprehensive income (loss)	0.1	0.2
Ending Balance	(4.8)	(5.0)
Unrealized gain (loss) on investments
Beginning Balance	3.5	2.7
Other comprehensive income (loss) before reclassifications	0.2	0.5
Income taxes		(0.2)
Net other comprehensive income (loss) before reclassifications	0.2	0.3
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0
Income taxes	0.0	0.0
Net amounts reclassified from cumulative other comprehensive income (loss)	0.0	0.0
Total other comprehensive income (loss)	0.2	0.3
Ending Balance	4.4	3.0
Other
Beginning Balance	(1.5)	(0.7)
Other comprehensive income (loss) before reclassifications		0.0
Income taxes	0.0	0.0
Net other comprehensive income (loss) before reclassifications	0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0
Income taxes	0.0	0.0
Net amounts reclassified from cumulative other comprehensive income (loss)	0.0	0.0
Total other comprehensive income (loss)	0.0	0.0
Ending Balance	(1.5)	$ (0.7)
AOCI Attributable to Parent [Member]
Beginning Balance	(122.1)
Ending Balance	(134.9)
Accounting Standards Update 2018-02 [Member]
Effect of adoption of ASU 2018-02	0.0
Ending Balance	(16.7)
Accounting Standards Update 2018-02 [Member] \| Foreign currency translation adjustments
Effect of adoption of ASU 2018-02	0.0
Accounting Standards Update 2018-02 [Member] \| Actuarial loss, net of tax
Effect of adoption of ASU 2018-02	(17.4)
Accounting Standards Update 2018-02 [Member] \| Prior service cost, net of tax
Effect of adoption of ASU 2018-02	0.0
Accounting Standards Update 2018-02 [Member] \| Unrealized gain (loss) on investments
Effect of adoption of ASU 2018-02	0.7
Accounting Standards Update 2018-02 [Member] \| Other
Effect of adoption of ASU 2018-02	0.0
Accounting Standards Update 2018-02 [Member] \| AOCI Attributable to Parent [Member]
Effect of adoption of ASU 2018-02	$ (16.7)

Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended
Discontinued Operations (Details) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations before tax	$ (5.3)	$ 0.0
Composite decking products [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations before tax	$ 5.0

- 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

Revenue (Details) - USD ($) $ in Millions	3 Months Ended
Revenue (Details) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Rebates accrued	$ 18.7		$ 24.2
Consignment inventory	19.0		$ 18.3
Revenue by product line and product type	691.3	$ 610.9
Siding [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	227.0	214.0
OSB [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	313.3	268.4
EWP [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	100.7	82.1
South America [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	42.4	37.8
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	7.9	8.7
Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	(0.1)
SmartSide Strand siding [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	171.9	162.3
SmartSide Strand siding [Member] \| Siding [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	165.1	156.1
SmartSide Strand siding [Member] \| OSB [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
SmartSide Strand siding [Member] \| EWP [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
SmartSide Strand siding [Member] \| South America [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	6.8	6.2
SmartSide Strand siding [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
SmartSide Strand siding [Member] \| Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
SmartSide Fiber siding [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	25.9	28.7
SmartSide Fiber siding [Member] \| Siding [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	25.9	28.7
SmartSide Fiber siding [Member] \| OSB [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
SmartSide Fiber siding [Member] \| EWP [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
SmartSide Fiber siding [Member] \| South America [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
SmartSide Fiber siding [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
SmartSide Fiber siding [Member] \| Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
CanExel siding [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	13.9	14.3
CanExel siding [Member] \| Siding [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	13.9	14.3
CanExel siding [Member] \| OSB [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
CanExel siding [Member] \| EWP [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
CanExel siding [Member] \| South America [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
CanExel siding [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
CanExel siding [Member] \| Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
OSB - commodity [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	192.6	164.8
OSB - commodity [Member] \| Siding [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	8.7	12.4
OSB - commodity [Member] \| OSB [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	181.1	151.3
OSB - commodity [Member] \| EWP [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	2.8	1.1
OSB - commodity [Member] \| South America [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
OSB - commodity [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
OSB - commodity [Member] \| Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
OSB - value-add [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	177.3	146.6
OSB - value-add [Member] \| Siding [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	9.2	0.0
OSB - value-add [Member] \| OSB [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	129.1	113.1
OSB - value-add [Member] \| EWP [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	4.1	2.9
OSB - value-add [Member] \| South America [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	34.9	30.6
OSB - value-add [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
OSB - value-add [Member] \| Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
LVL [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	36.6	33.0
LVL [Member] \| Siding [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
LVL [Member] \| OSB [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
LVL [Member] \| EWP [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	36.6	33.0
LVL [Member] \| South America [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
LVL [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
LVL [Member] \| Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
LSL [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	13.3	10.6
LSL [Member] \| Siding [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
LSL [Member] \| OSB [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
LSL [Member] \| EWP [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	13.3	10.6
LSL [Member] \| South America [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
LSL [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
LSL [Member] \| Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
I Joist [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	32.1	25.7
I Joist [Member] \| Siding [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
I Joist [Member] \| OSB [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
I Joist [Member] \| EWP [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	32.1	25.7
I Joist [Member] \| South America [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
I Joist [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
I Joist [Member] \| Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
Plywood [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	7.6	4.8
Plywood [Member] \| Siding [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
Plywood [Member] \| OSB [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
Plywood [Member] \| EWP [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	7.6	4.8
Plywood [Member] \| South America [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
Plywood [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
Plywood [Member] \| Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	20.1	20.1
Other [Member] \| Siding [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	4.2	2.5
Other [Member] \| OSB [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	3.1	4.0
Other [Member] \| EWP [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	4.2	4.0
Other [Member] \| South America [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.7	1.0
Other [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	7.9	8.7
Other [Member] \| Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	(0.1)
Commodity [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	200.2	169.6
Commodity [Member] \| Siding [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	8.7	12.4
Commodity [Member] \| OSB [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	181.1	151.3
Commodity [Member] \| EWP [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	10.4	5.9
Commodity [Member] \| South America [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
Commodity [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
Commodity [Member] \| Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
Value-add [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	471.0	421.2
Value-add [Member] \| Siding [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	214.1	199.1
Value-add [Member] \| OSB [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	129.1	113.1
Value-add [Member] \| EWP [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	86.1	72.2
Value-add [Member] \| South America [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	41.7	36.8
Value-add [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
Value-add [Member] \| Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.0	0.0
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	20.1	20.1
Other [Member] \| Siding [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	4.2	2.5
Other [Member] \| OSB [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	3.1	4.0
Other [Member] \| EWP [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	4.2	4.0
Other [Member] \| South America [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	0.7	1.0
Other [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	7.9	8.7
Other [Member] \| Intersegment [Member]
Disaggregation of Revenue [Line Items]
Revenue by product line and product type	$ 0.0	$ (0.1)