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Document and Entity Information - shares	3 Months Ended	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2013	Sep. 30, 2013	Nov. 05, 2013
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	Sep. 30, 2013
Document Fiscal Year Focus		2013
Document Fiscal Period Focus		Q3
Amendment Flag		false
Entity Common Stock, Shares Outstanding			141,121,253

Consolidated Statement of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net sales	$ 507.4	$ 462.1	$ 1,605.5	$ 1,237.3
Operating costs and expenses:
Cost of sales	416.3	364.4	1,221.7	1,026.9
Depreciation and amortization	25.8	18.8	65.0	55.5
Selling and administrative	33.5	30.5	103.6	92.1
(Gain) loss on sale or impairment of long-lived assets, net	0.3	4.3	(0.4)	4.5
Other operating credits and charges, net	(16.1)	1.2	(9.1)	1.2
Total operating costs and expenses	459.8	419.2	1,380.8	1,180.2
Income from operations	47.6	42.9	224.7	57.1
Non-operating income (expense):
Interest expense, net of capitalized interest	(7.6)	(10.7)	(28.0)	(36.4)
Investment income	1.7	4.1	8.3	11.7
Early debt extinguishment	(0.8)	0.0	(0.8)	(52.2)
Gain on acquisition	0.0	0.0	35.9	0.0
Other non-operating items	1.0	0.4	(3.3)	(2.3)
Total non-operating expense	(5.7)	(6.2)	12.1	(79.2)
Income (loss) from continuing operations before taxes and equity in (income) loss of unconsolidated affiliates	41.9	36.7	236.8	(22.1)
Provision (benefit) for income taxes	4.4	7.7	51.6	(5.6)
IncomeLossFromEquityMethodInvestments	0.0	2.0	11.3	(2.6)
Income (loss) from continuing operations	37.5	31.0	196.5	(19.1)
Income from discontinued operations before taxes	1.0	0.5	1.6	2.8
Provision for income taxes	0.4	0.2	0.6	1.0
Income from discontinued operations	0.6	0.3	1.0	1.8
Net income (loss)	$ 38.1	$ 31.3	$ 197.5	$ (17.3)
Income (loss) per share of common stock (basic):
Income (loss) from continuing operations	$ 0.27	$ 0.23	$ 1.41	$ (0.14)
Income from discontinued operations	0.00	0.00	0.01	0.01
Net income (loss) per share	0.27	0.23	1.42	(0.13)
Net income (loss) per share of common stock (diluted):
Income (loss) from continuing operations	0.26	0.22	1.36	(0.14)
Income from discontinued operations	0.00	0.00	0.01	0.01
Net income (loss) per share	$ 0.26	$ 0.22	$ 1.37	$ (0.13)
Average shares of stock outstanding - basic	140.0	137.1	139.1	136.9
Average shares of stock outstanding - diluted	144.0	142.6	144.1	136.9

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income (loss)	$ 38.1	$ 31.3	$ 197.5	$ (17.3)
Other comprehensive income (loss)
Foreign currency translation adjustments	0.3	2.9	(6.8)	1.7
Unrealized loss on derivative instrument	(0.1)	(0.5)	(0.1)	(0.7)
Unrealized gain (loss) on marketable securities, net of reversals	(0.2)	0.5	1.0	0.7
Defined benefit pension plans	1.0	0.7	4.0	2.7
Other comprehensive income (loss), net of tax	1.0	3.6	(1.9)	4.4
Comprehensive income (loss)	$ 39.1	$ 34.9	$ 195.6	$ (12.9)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 669.5	$ 560.9
Receivables, net of allowance for doubtful accounts of $1.1 million at September 30, 2013 December 31, 2012	109.2	82.7
Inventories	225.0	209.8
Other current assets	10.2	6.0
Deferred income taxes	13.7	12.3
Current portion of notes receivable from asset sales	0.0	91.4
Assets held for sale	31.4	32.5
Total current assets	1,059.0	995.6
Timber and timberlands	72.2	40.1
Property, plant and equipment, at cost	2,214.3	2,061.6
Accumulated depreciation	(1,350.3)	(1,310.8)
Net property, plant and equipment	864.0	750.8
Goodwill	9.7	0.0
Notes receivable from asset sales	432.2	432.2
Long-term investments	3.8	2.0
Restricted cash	11.2	12.0
Investments in and advances to affiliates	4.2	68.6
Deferred debt costs	7.4	9.2
Other assets	33.8	15.5
Long-term deferred tax asset	0.0	5.0
Total assets	2,497.5	2,331.0
LIABILITIES AND EQUITY
Current portion of long-term debt	2.3	7.8
Current portion of limited recourse notes payable	0.0	90.0
Accounts payable and accrued liabilities	173.5	139.5
Current portion of contingency reserves	2.0	2.0
Total current liabilities	177.8	239.3
Long-term debt, excluding current portion	763.3	782.7
Contingency reserves, excluding current portion	12.4	12.8
Other long-term liabilities	171.8	168.8
Deferred income taxes	148.4	93.6
Stockholders' equity:
Common stock	152.0	150.4
Additional paid-in capital	505.7	533.6
Retained earnings	908.1	710.6
Treasury stock	(232.2)	(252.9)
Accumulated comprehensive loss	(109.8)	(107.9)
Total stockholders' equity	1,223.8	1,033.8
Total liabilities and stockholders' equity	$ 2,497.5	$ 2,331.0

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2013	Dec. 31, 2012
Allowance for doubtful accounts	$ 1.1	$ 1.1

Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 38.1	$ 31.3	$ 197.5	$ (17.3)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	25.8	18.8	65.0	55.5
(Income) loss from unconsolidated affiliates	0.0	(2.0)	(11.3)	2.6
(Gain) loss on sale or impairment of long-lived assets	0.3	4.3	(0.4)	4.5
Gain on acquisition	0.0	0.0	(35.9)	0.0
Gain on sale of dicontinued operation	(1.7)	0.0	(1.7)	0.0
Early debt extinguishment	(0.8)	0.0	(0.8)	(52.2)
Payment of long-term deposit		0.0	(17.1)	0.0
Other operating credits and charges, net	(16.1)	1.2	(9.1)	1.2
Stock-based compensation related to stock plans	2.4	1.8	6.6	6.4
Exchange (gain) loss on remeasurement	(0.4)	5.7	(0.5)	4.8
Cash settlement of contingencies	0.0	(0.4)	(0.4)	(1.6)
Cash settlements of warranties	(3.4)	(3.0)	(7.7)	(6.9)
Pension expense, net of cash payments	(0.1)	2.2	2.5	6.3
Non-cash interest expense, net	1.2	0.5	1.8	1.9
Other adjustments, net of acquisition	0.3	(1.7)	1.2	(0.3)
Increase in receivables	(7.9)	(2.8)	(25.8)	(38.3)
(Increase) decrease in inventories	15.8	(5.6)	(12.3)	(41.6)
(Increase) decrease in other current assets	1.7	0.6	(4.3)	(2.4)
Increase in accounts payable and accrued liabilities	17.1	7.2	26.0	26.6
Increase (decrease) in deferred income taxes	2.4	7.7	47.9	(4.8)
Net cash provided by operating activities	59.2	65.8	222.8	48.8
CASH FLOWS FROM INVESTING ACTIVITIES:
Property, plant, and equipment additions	(17.7)	(9.3)	(43.3)	(16.1)
Investments in and advances to joint ventures	0.0	8.8	13.9	6.6
Proceeds from sales of assets	15.0	0.0	16.7	9.1
Acquisition, net of cash	0.0	0.0	(67.4)	0.0
Payment of long-term deposit	(17.1)
Receipt of proceeds from notes receivable	91.4	0.0	91.4	0.0
(Increase) decrease in restricted cash under letters of credit/credit facility	(0.7)	0.0	0.7	1.0
Net cash provided by (used in) investing activities	88.0	(0.5)	12.0	0.6
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowing long-term debt	0.0	0.0	0.0	350.0
Repayment of long-term debt	(109.5)	(0.2)	(113.1)	(242.3)
Taxes paid related to net share settlement of equity awards	0.0	0.0	(12.0)	0.0
Payments of debt Issuance fees	0.0	0.0	0.0	6.3
Other, net	(0.1)	0.8	(0.1)	1.2
Net cash provided by (used in) financing activities	(109.6)	0.6	(125.2)	102.6
EFFECT OF EXCHANGE RATE ON CASH AND CASH EQUIVALENTS	1.2	(2.5)	(1.0)	(1.5)
Net increase in cash and cash equivalents	38.8	63.4	108.6	150.5
Cash and cash equivalents at beginning of period	630.7	427.1	560.9	340.0
Cash and cash equivalents at end of period	$ 669.5	$ 490.5	$ 669.5	$ 490.5

Consolidated Statements of Stockholders' Equity - 9 months ended Sep. 30, 2013 - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Comprehensive Loss
Proceeds from Warrant Exercises		$ 1.6
Adjustments to Additional Paid in Capital, Warrant Issued	$ 0.0			$ (1.6)
Balance, Beginning Value at Dec. 31, 2012	1,033.8	$ 150.4	$ (252.9)	533.6	$ 710.6	$ (107.9)
Balance, Beginning Value, Shares at Dec. 31, 2012		150.4	(11.9)
Net income (loss)	197.5				197.5
Issuance of shares for employee stock plans and stock based compensation	0.1		$ 32.7	(32.6)
Taxes paid related to net share settlement of equity awards			(0.6)
Taxes paid related to net share settlement of equity awards	(12.0)		$ (12.0)
Stock Issued During Period, Shares, Conversion of Convertible Securities		1.6
Issuance of shares for employee stock plans and stock-based compensation			1.6
Compensation expense associated with stock awards	6.3			6.3
Other comprehensive income	(1.9)					(1.9)
Balance, Ending Value, Shares at Sep. 30, 2013		152.0	(10.9)
Balance, Ending Value at Sep. 30, 2013	$ 1,223.8	$ 152.0	$ (232.2)	$ 505.7	$ 908.1	$ (109.8)

Basis For Presentation	9 Months Ended
Basis For Presentation	Sep. 30, 2013
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, except for other operating credits and charges, net referred to in Note 10) necessary to present fairly, in all material respects, the consolidated financial position, results of operations and cash flows of LP and its 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 LP’s Annual Report on Form 10-K for the year ended December 31, 2012. During the third quarter of 2013, LP sold its moulding operations and has included the results of operations of this business in discontinued operations for all periods presented.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

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+ Details

Stock-Based Compensation

9 Months Ended

Sep. 30, 2013

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

Stock-Based Compensation

STOCK-BASED COMPENSATION

At September 30, 2013, LP had stock-based employee compensation plans as described below. The total compensation expense related to all of LP’s stock-based compensation plans was $2.4 million for the quarter ended September 30, 2013 as compared to $1.8 million for the quarter ended September 30, 2012 and $6.6 million for the nine months ended September 30, 2013 and $6.4 million for the nine months ended September 30, 2012.

Stock Compensation Plans

LP grants options to purchase LP common stock and stock settled stock appreciation rights (SSARs) to key employees and directors. On exercise, LP generally issues shares from treasury to settle these awards. The options and SSARs are granted at market price at the date of grant. For employees, SSARs become exercisable ratably over a three year period and expire ten years after the date of grant. For directors, these options historically have become exercisable in 10% increments every three months, starting three months after the date of grant, and expire ten years after the date of grant. At September 30, 2013, 5.6 million shares were available under the current stock award plans for stock-based awards.

The following table sets out the weighted average assumptions used to estimate the fair value of the options and SSARs granted using the Black-Scholes option-pricing model in the first nine months of the respective years noted:



	2013	2012
Expected stock price volatility	69.2%	63.6%
Expected dividend yield	—%	—%
Risk-free interest rate	0.9%	0.7%
Expected life of options	5 years	5 years
Weighted average fair value of options and SSARs granted	$11.68	$4.75

The following table summarizes stock options and SSARs outstanding as of September 30, 2013, as well as activity during the nine month period then ended.



Share amounts in thousands	Options and SSARs		Weighted Average Exercise Price		Weighted Average Contractual Term (in years)	Aggregate Intrinsic Value (in millions)
Options / SSARs outstanding at January 1, 2013	8,475		$	12.88
SSARs granted	343		20.49
Options / SSARs exercised	(1,854	)	9.03
Options /SSARs canceled	—		—
Options/SSARs outstanding at September 30, 2013	6,964		$	14.28	5.2	$	37.4
Vested and expected to vest at September 30, 2013	6,615		—		—	$	35.5
Options/SSARS exercisable at September 30, 2013	5,724		$	14.72	—	$	29.9

The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value (the difference between LP's closing stock price on the last trading day of the third quarter of 2013 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 September 30, 2013. This amount changes based on the market value of LP's stock as reported by the New York Stock Exchange.

As of September 30, 2013, there was $5.0 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 1.4 years. LP recorded compensation expense related to these awards in the first nine months of 2013 of $2.5 million.

Incentive Share Awards

LP has granted incentive share stock awards (restricted stock units) to certain key employees and directors. The employee awards vest three years from date of grant and awards to directors vest one year from date of grant. The awards entitle the participant to receive a specified number of shares of LP common stock at no cost to the participant. The market value at the time of grant approximates the fair value. LP recorded compensation expense related to these awards in the first nine months of 2013 of $2.0 million. As of September 30, 2013, there was $3.9 million of total unrecognized compensation cost related to unvested incentive share awards. This expense will be recognized over a weighted-average period of 1.1 years.

The following table summarizes incentive share awards outstanding as of September 30, 2013 as well as activity during the nine months then ended.



	Shares		Weighted Average Contractual Term (in years)	Aggregate Intrinsic Value (in millions)
Incentive share awards outstanding at January 1, 2013	960,388
Incentive share awards granted	158,474
Incentive share awards vested	(346,107	)
Incentive share awards canceled	(478	)
Incentive shares outstanding at September 30, 2013	772,277		1.1	$	13.5
Vested and expected to vest at September 30, 2013	733,663		—	$	12.8

Restricted Stock

LP grants restricted stock to certain senior employees. The shares for employees vest three years from the date of grant and for directors vest five years from 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 vesting period. As of September 30, 2013, there was $2.9 million of total unrecognized compensation costs related to restricted stock. This expense will be recognized over the next 1.3 years. LP recorded compensation expense related to these awards in the first nine months of 2013 of $1.3 million.

The following table summarizes the restricted stock outstanding as of September 30, 2013 as well as activity during the nine months then ended.



	Number of Shares		Weighted Average Grant Date Fair Value
Restricted stock awards outstanding at January 1, 2013	556,987		$	8.51
Restricted stock awards granted	108,174		20.49
Restrictions lapsed	(205,739	)	7.00
Restricted stock awards at September 30, 2013	459,422		$	12.01

LP annually grants to each director restricted stock units with a one year vesting period. As of September 30, 2013, LP has 93,179 shares (or restricted stock units) outstanding under this program. Compensation expense recognized in the first nine months of 2013 related to these grants was $0.2 million.

Performance share awards

In connection with Mr. Stevens' appointment to Chief Executive Officer on May 4, 2012, he was awarded 300,000 performance shares. LP recorded compensation expense related to these awards of $0.3 million in the first nine months of 2013. As of September 30, 2013, there was $0.9 million of total unrecognized compensation costs related to this award. This expense will be recognized over the next 2.6 years.

Phantom stock

During 2011 and 2012, LP made annual grants of phantom stock units to its directors. Subsequent to the approval of the 2013 Omnibus Plan, phantom stock units are no longer granted to directors. The director does not receive rights of a shareholder, nor is any stock transfered. The units will be paid out in cash at the end of the five year vesting period. The value of one unit is based on the market value of one share of common stock on the vesting date. The cost of the grants is recognized over the vesting period and is included in stock-based compensation expense. Since these awards are settled in cash, such awards are required to be remeasured based upon the changes in LP's stock price. As of September 30, 2013, LP had 75,816 shares outstanding under this program. LP recorded compensation expense related to these awards of $0.3 million in the first nine months of 2013.

Fair Value Measurements

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

Fair Value Measurements

FAIR VALUE MEASUREMENTS

LP’s investments that are measured at fair value on a recurring basis are categorized below using the fair value hierarchy. LP also measures the contingent consideration associated with the business combination (as discussed further in Note 19) using the fair value hierarchy. The fair value hierarchy has three levels based on the reliability of the inputs used to determine fair value. Level 1 refers to fair values determined based on quoted prices in active markets for identical assets. Level 2 refers to fair values estimated using significant other observable inputs and Level 3 includes fair values estimated using significant non-observable inputs.

The following table summarizes assets and liabilities measured on a recurring basis for each of the three hierarchy levels presented below.



Dollar amounts in millions	September 30, 2013		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	$	3.8	$	—	$	—	$	3.8
Trading securities	2.0		2.0		—		—
Contingent consideration	7.2		—		—		7.2
Total	$	13.0	$	2.0	$	—	$	11.0
Dollar amounts in millions	December 31, 2012		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	$	2.0	$	—	$	—	$	2.0
Trading securities	1.7		1.7		—		—
Total	$	3.7	$	1.7	$	—	$	2.0

Due to the lack of observable market quotations on a portion of LP’s auction rate securities (ARS) portfolio, LP evaluates the structure of its ARS holdings and current market estimates of fair value, including fair value estimates from issuing 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 LP’s ARS investment portfolio is subject to uncertainties that are difficult to predict. Factors that may impact LP’s 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.

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 nine months ended September 30, 2013 and 2012.



Dollar amounts in millions	Available for sale securities		Contingent consideration
Balance at December 31, 2011	$	0.7	$	—
Total realized/unrealized gains included in other comprehensive income	1.1		—
Balance at September 30, 2012	$	1.8	$	—

Balance at December 31, 2012	$	2.0	$	—
Contingent consideration pursuant to business combination (see Note 19)	—		24.3
Adjustment to contingent consideration fair value	—		(17.3		)
Total realized/unrealized gains included in other comprehensive income	1.8		—
Foreign currency gain	—		0.2
Balance at September 30, 2013	$	3.8	$	7.2

Carrying amounts reported on the balance sheet for cash, cash equivalents, receivables and accounts payable approximate fair value due to the short-term maturity of these items.

During the third quarter of 2013, LP recognized a gain of $17.3 million as a fair value adjustment to the contingent consideration associated with a business combination (as discussed in Note 19). The fair value of the contingent consideration was reduced during the third quarter of 2013 due to the decline in projected OSB prices and resulting reduction in the estimated payment obligation The fair value adjustment is recorded in Other Operating Credits and Charges, Net. This fair value was determined based upon the income approach using significant non-observable inputs such as projected OSB pricing taking into consideration volatility of such projections.

During the third quarter of 2012, LP recognized an impairment charge of $4.4 million on an OSB mill in Quebec, Canada, based upon a change in the plan of sale of various assets held for sale to reduce their carrying value to the estimated selling price less selling costs. The valuation of these assets was determined using Level 2 inputs under the market approach.

- 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

9 Months Ended

Sep. 30, 2013

Earnings Per Share [Abstract]

Earnings per Share

EARNINGS PER SHARE

Basic earnings per share are based on the weighted-average number of shares of common stock outstanding. Diluted earnings per share are based upon the weighted-average number of shares of common stock outstanding plus all potentially dilutive securities that were assumed to be converted into common shares at the beginning of the period under the treasury stock method. This method requires that the effect of potentially dilutive common stock equivalents (stock options, stock settled stock appreciation rights, incentive shares and warrants) be excluded from the calculation of diluted earnings per share for the periods in which LP recognizes losses from continuing operations or at such time that the exercise prices of such awards are in excess of the weighted average market price of LP's common stock during these periods because the effect is anti-dilutive. Performance share awards are included in the calculation of earnings per share using the contingently issuable method. The following table sets forth the computation of basic and diluted earnings per share:



Dollar and share amounts in millions, except per share amounts	Quarter Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Numerator:
Income (loss) attributed to LP common shares:
Income (loss) from continuing operations	$	37.5	$	31.0	$	196.5	$	(19.1	)
Income from discontinued operations	0.6		0.3		1.0		1.8
Net income (loss)	$	38.1	$	31.3	$	197.5	$	(17.3	)
Denominator:
Basic - weighted average common shares outstanding	140.0		137.1		139.1		136.9
Dilutive effect of stock warrants	1.8		3.0		2.5		—
Dilutive effect of stock plans	2.2		2.5		2.5		—
Diluted shares outstanding	144.0		142.6		144.1		136.9
Basic earnings per share:
Income (loss) from continuing operations	$	0.27	$	0.23	$	1.41	$	(0.14	)
Income from discontinued operations	—		—		0.01		0.01
Net income (loss) per share	$	0.27	$	0.23	$	1.42	$	(0.13	)
Diluted earnings per share:
Income (loss) from continuing operations	$	0.26	$	0.22	$	1.36	$	(0.14	)
Income from discontinued operations	—		—		0.01		0.01
Net income (loss) per share	$	0.26	$	0.22	$	1.37	$	(0.13	)

For the quarter and nine months ended September 30, 2013, stock options and SSARs related to approximately 2.4 million and 2.3 million shares of LP common stock were considered not in-the-money for purposes of LP's earnings per share calculation. For the quarter ended September 30, 2012, stock options, stock warrants and SSARs relating to approximately 4.4 million share of LP common stock were considered not in-the-money for purposes of LP's earnings per share calculation. For the nine months ended September 30, 2012, stock options, stock warrants and SSARs related to approximately 11.1 million shares of LP common stock were considered anti-dilutive for purposes of LP’s earnings per share calculation due to LP’s loss position from continuing operations.

At September 30, 2013, outstanding warrants were exercisable to purchase approximately 1,462,119 shares.

Receivables

9 Months Ended

Sep. 30, 2013

Receivables [Abstract]

Receivables

RECEIVABLES

Receivables consist of the following:



Dollar amounts in millions	September 30, 2013			December 31, 2012
Trade receivables	$	102.1		$	76.0
Interest receivables	0.7			0.8
Income tax receivable	0.8			1.8
Other receivables	6.7			5.2
Allowance for doubtful accounts	(1.1		)	(1.1		)
Total	$	109.2		$	82.7

Other receivables at September 30, 2013 and December 31, 2012 primarily consist of sales tax receivables, receivables from joint ventures, accrued receivables and other items.

- 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

9 Months Ended

Sep. 30, 2013

Inventory Disclosure [Abstract]

Inventories

INVENTORIES

Inventories are valued at the lower of cost or market. 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	September 30, 2013			December 31, 2012
Logs	$	42.9		$	37.6
Other raw materials	20.3			17.7
Finished products	148.5			142.7
Supplies	14.3			12.8
LIFO reserve	(1.0		)	(1.0		)
Total	$	225.0		$	209.8

Assets Held for Sale

9 Months Ended

Sep. 30, 2013

Property, Plant and Equipment Assets Held-for-sale Disclosure [Abstract]

Assets Held for Sale

ASSETS HELD FOR SALE

Over the last several years, LP has adopted and implemented plans to sell selected assets in order to improve its operating results. LP is required to classify assets held for sale which are not part of a discontinued business separately on the face of the financial statements outside of “Property, plant and equipment.” As of September 30, 2013 and December 31, 2012, LP included two OSB mills and various assets at a third OSB mill, as well as various non-operating sites, in its held for sale category. During the third quarter of 2012, LP recognized an impairment charge of $4.4 million on an OSB mill in Quebec, Canada, based upon a change in the plan of sale of various assets held for sale to reduce their carrying value. The current book values of assets held for sale by category is as follows:



Dollars in millions	September 30, 2013			December 31, 2012
Property, plant and equipment, at cost:
Land, land improvements and logging roads, net of road amortization	$	9.9		$	10.0
Buildings	15.6			17.1
Machinery and equipment	140.7			140.8
	166.2			167.9
Accumulated depreciation	(134.8		)	(135.4		)
Net property, plant and equipment	$	31.4		$	32.5

Income Taxes

9 Months Ended

Sep. 30, 2013

Current Income Tax Expense (Benefit), Continuing Operations [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 bases 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 quarter 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.

The income tax components and associated effective income tax rates for the quarter and nine months ended September 30, 2013 and 2012 are as follows:



	Quarter Ended September 30,
	2013				2012
Dollars in millions	Tax Provision		Tax Rate		Tax Provision			Tax Rate
Continuing operations	$	4.4	11	%	$	7.7		20	%
Discontinued operations	0.4		35	%	0.2			35	%
	$	4.8	11	%	$	7.9		20	%

	Nine Months Ended September 30,
	2013				2012
	Tax Provision		Tax Rate		Tax Provision/(Benefit)			Tax Rate
Continuing operations	$	51.6	21	%	$	(5.6	)	23	%
Discontinued operations	0.6		35	%	1.0			35	%
	$	52.2	21	%	$	(4.6	)	21	%

For the first nine months of 2013, the primary differences between the U.S. statutory rate of 35% and the effective rate applicable to LP’s continuing operations relate to the effect of foreign tax rates and decreases in valuation allowances attributed to net operating loss carryforwards in various jurisdictions which are either anticipated to be utilized in the current year based upon projected income or recognized due to the recording of additional deferred tax liabilities. For the first nine months of 2012, the primary differences between the U.S. statutory rate of 35% and the effective rate applicable to LP’s continuing operations relate to the effect of foreign tax rates, increases in valuation allowances attributed to net operating loss carryforwards in various jurisdictions and increases in our reserves for uncertain tax positions.

LP periodically reviews the need for valuation allowances against deferred tax assets and recognizes these deferred tax assets to the extent that the realization is more likely than not. Based solely upon the future reversal of existing deferred tax liabilities, LP believes that the valuation allowances provided are appropriate. If LP were to determine that it would not be able to realize a portion of an existing net deferred tax asset in excess of an existing valuation allowance, an adjustment to the net deferred tax asset would be charged to earnings in the period in which such determination was made. Conversely, if it were to make a determination that it is more likely than not that an existing deferred tax asset for which there is currently a valuation allowance would be realized, the related valuation allowance would be reduced and a benefit to earnings would be recorded in the period in which such determination was made.

As a result of certain recognition requirements of ASC 718 Compensation -- Stock Compensation, certain deferred tax assets as of September 30, 2013 are not recognized in relation to amounts of tax deductions for equity compensation that are greater than the compensation recognized for financial reporting. Equity will be increased by $13.5 million if and when such deferred tax assets are ultimately realized. LP uses the "with and without" method for determining when excess tax benefits have been realized.

LP and its domestic subsidiaries are subject to U.S. federal income tax as well as income taxes of multiple state jurisdictions. Its foreign subsidiaries are subject to income tax in Canada, Chile, Peru and Brazil. During 2011, the U.S. Internal Revenue Service (IRS) initiated an audit of tax years 2007 - 2009 for which field work has been completed. LP has protested certain proposed adjustments and requested review by the IRS Appeals Office. During the third quarter of 2013, LP deposited $17.1 million with the IRS to suspend the accrual of interest pending the resolution of this matter. The deposit is included within other assets on the Condensed Consolidated Balance Sheet. All U.S. federal audits of prior years have been completed. LP remains subject to state and local tax examinations for the tax years 2005 through 2012. Canadian federal income tax returns have been audited and effectively settled through 2008, and no examinations are currently in progress. Quebec provincial audits have been effectively settled through 2011. As of September 30, 2013, the Chilean Tax Office was in process of auditing tax year 2011.

Long-term Debt

9 Months Ended

Sep. 30, 2013

Debt Disclosure [Abstract]

Long-term Debt

LONG-TERM DEBT

LP’s long-term debt consists of the following:



Dollars in millions	September 30, 2013			December 31, 2012
Debentures:
Senior notes, maturing 2020	$	350.0		$	350.0
Bank credit facilities:
Chilean term credit facility, maturing 2019, denominated in UF	16.2			39.3
Brazilian export financing facility, maturing 2017	8.0			10.0
Limited recourse notes payable:
Senior notes, payable 2013 - 2018	22.0			112.0
Other financing
Non-recourse notes, payable 2018	368.7			368.7
Other	0.7			0.5
Total	765.6			880.5
Less: current portion	(2.3		)	(97.8		)
Net long-term portion	$	763.3		$	782.7

LP issued $348.6 million of senior notes in 1998 in a private placement to institutional investors. The remaining $22.0 million of the notes payable will mature in 2018 and are secured by $22.3 million of notes receivable from Green Diamond that will mature in 2018. Pursuant to the terms of the notes payable, in the event of a default by Green Diamond, LP would be liable to pay only 10% of the indebtedness represented by the notes payable.

LP issued $368.7 million of senior notes in 2003 in a private placement to unrelated third parties. The senior notes mature in 2018 and are supported by a bank letter of credit. LP’s reimbursement obligations under the letter of credit are secured by $410.0 million in notes receivable from asset sales. In general, the creditors under this arrangement have no recourse to LP’s assets, other than the notes receivable. However, under certain circumstances, LP may be liable for certain liabilities (including liabilities associated with the marketing or remarketing of the senior debt and reimbursement obligations, which are fully cash collateralized under the letter of credit supporting the notes payable) in an amount not to exceed 10% of the aggregate principal amount of the notes receivable.

In December 2009, LP entered into a term loan agreement with a Chilean bank. This loan is denominated in UF (inflation adjusted Chilean pesos) and is secured by substantially all of the property owned by LP Chile S.A. The loan was required to be repaid in 16 equal semi-annual payments that began in June 2012 and end in December 2019. Payments of $21.0 million were made during the year which included a scheduled payment of $2.6 million in the second quarter of 2013 and an optional prepayment of $18.4 million during the third quarter of 2013. The next scheduled payment is not due until June 2017. In connection with the prepayment, LP recorded a loss on early debt extinguishment of $0.8 million, which included $0.5 million associated with the unamortized financing costs associated with the loan. Any additional increases or decreases in the loan balance shown are related to changes in the underlying foreign currency exchange rates or required inflation adjustments.

In August 2011, LP entered into an export financing loan agreement with a Brazilian bank pursuant to which it borrowed $10.0 million. This loan is denominated in U.S. dollars, is to be repaid in 10 equal semi-annual payments that began in January 2013 and end in July 2017.

In May 2012, LP issued $350.0 million of 7.5% Senior Notes due 2020. LP used a portion of the proceeds to fully retire the remaining balance outstanding on its Senior Secured Notes due in 2017. In connection with this repurchase, LP recorded a loss on early debt extinguishment of $52.2 million which included $4.5 million associated with the unamortized financing costs associated with the Senior Secured Notes. On or after June 1, 2016, LP may, at its option on one or more occasions, redeem all or any portion of the Notes at specified redemption rates.

Obligations under the indenture governing LP's Senior Notes due 2020 are unsecured and not presently guaranteed by any of its subsidiaries. The indenture contains customary covenants applicable to LP and its 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 LP's obligations to repay the indebtedness outstanding thereunder.

LP estimated the Senior Notes maturing in 2020 to have a fair value of $378.9 million at September 30, 2013 and $397.3 million at December 31, 2012 based upon market quotations.

Additional descriptions of LP’s indebtedness are included in consolidated financial statements and the notes thereto included in LP’s Annual Report on Form 10-K for the year ended December 31, 2012.

Other Operating Credits and Charges, Net

9 Months Ended

Sep. 30, 2013

Other Operating Credits And Charges, Net [Abstract]

Other Operating Credits and Charges, Net

OTHER OPERATING CREDITS AND CHARGES, NET

The major components of “Other operating credits and charges, net” in the Consolidated Statements of Income for the third quarter and nine months ended September 30, 2013 and September 30, 2012 are reflected in the table below and are described in the paragraphs following the table:



	Quarter Ended September 30,						Nine Months Ended September 30,
Dollar amounts in millions	2013			2012			2013			2012
Other operating charges and credits net:
Adjustment related to prior year inventory	$	—		$	—		$	(1.6	)	$	—
Adjustment related to prior year depreciation	—			—			(1.5		)	—
Construction related legal reserve	—			—			—			0.5
Addition to warranty reserves	(2.0		)	(1.0		)	(6.1		)	(1.0		)
Refundable value added tax receivable	1.4			—			1.4			—
Insurance recovery	0.4			—			0.4			—
Contingent consideration fair value adjustment	17.3			—			17.3			—
Addition to workers compensation reserves	(1.0		)	—			(1.0		)	—
Other	—			(0.2		)	0.2			(0.7		)
	$	16.1		$	(1.2	)	$	9.1		$	(1.2	)
Other operating charges and credits associated with unconsolidated affiliates:
Valuation allowance associated with deferred taxes	$	—		$	—		$	(1.8	)	$	—
Addition to contingency reserves	—			—			(0.9		)	—
	$	—		$	—		$	(2.7	)	$	—

During the third quarter of 2013, LP recorded a gain of $0.4 million related to proceeds received from an insurance claim associated with an OSB mill and a reduction in the fair value of $17.3 million payable in relation to the contingent consideration associated with a business combination (as discussed in Note 19). LP also recorded a loss of $1.0 million associated with a workers compensation reserve adjustment. LP recorded a loss of $2.0 million during the quarter related to an increase in product related warranty reserves associated with CanExel products sold in certain geographic areas from 2004 through 2008. During the third quarter of 2013, LP recorded a receivable of $1.4 million related to value added taxes.

During the second quarter of 2013, LP recorded a loss of $1.5 million related to a correction of prior years depreciation amounts associated with LP's South American operations. During the second quarter of 2013, LP recorded a loss of $4.1 million related to an increase in product related warranty reserves associated with Canexel products sold in certain geographic areas from 2004 to 2008. Additionally, other operating charges and credits reflected in Equity in (income) loss from unconsolidated affiliates includes a charge of $1.8 million associated with a valuation allowance on the joint venture's books associated with deferred tax assets as well as a loss of $0.9 million associated with the recording of a contingent liability from past years.

During the first quarter of 2013, LP recorded a loss of $1.6 million related to a prior year inventory adjustment.

During the third quarter 2012, LP recorded a loss of $1.0 million related to an increase in product related warranty reserves associated with Canexel products sold in Europe in prior years.

LP recorded losses of $0.2 million and $0.7 million during the third quarter and first nine months of 2012 associated with severance related to an indefinitely curtailed OSB mill in British Columbia.

Transactions with Affiliates	9 Months Ended
Transactions with Affiliates	Sep. 30, 2013
Related Party Transactions [Abstract]
Transactions with Affiliates	TRANSACTIONS WITH AFFILIATES LP has an equity investment in Abitibi-LP, a manufacturer of I-joists with Resolute Forest Products. LP sells products and raw materials to Abitibi-LP and purchases products for resale from Abitibi-LP. LP eliminates 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 quarters ended September 30, 2013 and 2012, LP sold $3.3 million and $2.6 million of products to Resolute-LP and purchased $13.9 million and $11.3 million of I-joists from Resolute-LP. For the nine month period ended September 30, 2013 and 2012, LP sold $10.7 million and $6.3 million of products to Resolute-LP and purchased $38.4 million and $29.7 million of I-joists from Resolute-LP. Included in LP’s Consolidated Balance Sheets at September 30, 2013 and December 31, 2012 are $2.6 million and $1.4 million in accounts receivable from this affiliates and $1.3 million and $6.7 million in accounts payable from this affiliate. LP purchased $42.6 million of OSB from Canfor-LP during the quarter ended September 30, 2012. LP also purchased $98.2 million and $101.9 million of OSB from Canfor-LP during the nine month period ended September 30, 2013 and 2012.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References + Details

Legal and Environmental Matters	9 Months Ended
Legal and Environmental Matters	Sep. 30, 2013
Legal and Environmental Matters [Abstract]
Legal and Environmental Matters	LEGAL AND ENVIRONMENTAL MATTERS Certain environmental matters and legal proceedings are discussed below. Environmental Matters LP maintains 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. LP's estimates of its 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. LP regularly monitors its estimated exposure to environmental loss contingencies and, as additional information becomes known, may change its estimates significantly. 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 the financial position, results of operations, cash flows or liquidity of LP.

Selected Segment Data

9 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

Selected Segment Data

SELECTED SEGMENT DATA

LP operates in four segments: Oriented Strand Board (OSB), Siding, Engineered Wood Products (EWP) and South America. LP’s business units have been aggregated into these four segments based upon the similarity of economic characteristics, customers and distribution methods. LP’s 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 LP’s Annual Report on Form 10-K for the year ended December 31, 2012.



	Quarter Ended September 30,						Nine Months Ended September 30,
Dollar amounts in millions	2013			2012			2013			2012
Net sales:
OSB	$	245.4		$	226.6		$	838.3		$	571.0
Siding	149.0			134.1			435.5			384.2
Engineered Wood Products	71.8			61.5			196.1			161.8
South America	41.5			42.0			130.9			127.1
Other	3.9			3.4			10.3			10.1
Intersegment sales	(4.2		)	(5.5		)	(5.6		)	(16.9		)
	$	507.4		$	462.1		$	1,605.5		$	1,237.3
Operating profit (loss):
OSB	$	30.2		$	49.3		$	223.7		$	66.0
Siding	22.5			20.3			70.3			56.4
Engineered Wood Products	(2.0		)	(3.0		)	(10.6		)	(9.3		)
South America	5.3			4.5			17.8			11.2
Other	(2.1		)	(2.6		)	(6.1		)	(7.8		)
Other operating credits and charges, net	16.1			(1.2		)	9.1			(1.2		)
Other operating credits and charges associated with unconsolidated affiliates	—			—			(2.7		)	—
Gain (loss) on sale or impairment of long-lived assets	(0.3		)	(4.3		)	0.4			(4.5		)
Gain on acquisition	—			—			35.9			—
Early debt extinguishment	(0.8		)	—			(0.8		)	(52.2		)
General corporate and other expenses, net	(22.1		)	(18.1		)	(65.9		)	(56.3		)
Foreign currency gain (loss)	1.0			0.4			(3.3		)	(2.3		)
Investment income	1.7			4.1			8.3			11.7
Interest expense, net of capitalized interest	(7.6		)	(10.7		)	(28.0		)	(36.4		)
Income (loss) from continuing operations before taxes	41.9			38.7			248.1			(24.7		)
Provision (benefit) for income taxes	4.4			7.7			51.6			(5.6		)
Income (loss) from continuing operations	$	37.5		$	31.0		$	196.5		$	(19.1	)

Other operating charges and credits,net presented above includes both those items directly related to LP as well as those reflected in Equity in (income) loss of unconsolidated affiliates

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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+ Details

Potential Impairments	9 Months Ended
Potential Impairments	Sep. 30, 2013
Asset Impairment Charges [Abstract]
Potential Impairments	POTENTIAL IMPAIRMENTS LP continues to review certain operations and investments for potential impairments. LP’s management currently believes it has 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 September 30, 2013, there were no indications of impairment for the asset grouping that includes the company's indefinitely curtailed facilities. As of September 30, 2013, the fair value of facilities that have not been indefinitely curtailed are substantially in excess of its carrying value and supports the conclusion that no impairment is necessary for those facilities. LP also reviews 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, LP may be required to record impairment charges in connection with decisions to dispose of assets.

Contingency Reserves

9 Months Ended

Sep. 30, 2013

Commitments and Contingencies Disclosure [Abstract]

Contingency Reserves

CONTINGENCY RESERVES

LP maintains reserves for various contingent liabilities as follows:



Dollar amounts in millions	September 30, 2013			December 31, 2012
Environmental reserves	$	13.9		$	14.1
Other reserves	0.5			0.7
Total contingency reserves	14.4			14.8
Current portion of contingency reserves	(2.0		)	(2.0		)
Long-term portion of contingency reserves	$	12.4		$	12.8

See Note 12 for discussion of environmental matters.

Defined Benefit Pension Plans

9 Months Ended

Sep. 30, 2013

Compensation and Retirement Disclosure [Abstract]

Compensation and Employee Benefit Plans

DEFINED BENEFIT PENSION PLANS

The following table sets forth the net periodic pension cost for LP’s defined benefit pension plans during the quarter ended September 30, 2013 and 2012. The net periodic pension cost included the following components:



	Quarter Ended September 30,						Nine Months Ended September 30,
Dollar amounts in millions	2013			2012			2013			2012
Service cost	$	0.8		$	0.9		$	2.5		$	2.7
Interest cost	3.2			3.7			9.7			11.0
Expected return on plan assets	(4.1		)	(4.3		)	(12.4		)	(12.7		)
Amortization of prior service cost	0.1			0.1			0.2			0.2
Amortization of net loss	1.8			1.7			5.5			5.0
Net periodic pension cost	$	1.8		$	2.1		$	5.5		$	6.2

During the nine months ended September 30, 2013, LP made $3.2 million in pension contributions for LP’s Canadian defined benefit plans. LP presently anticipates making approximately $1.9 million in additional pension contributions for the plans during the remainder of 2013.

Guarantees and Indemnifications

9 Months Ended

Sep. 30, 2013

Commitments and Contingencies Disclosure [Abstract]

Guarantees and Indemnifications

GUARANTEES AND INDEMNIFICATIONS

LP is a party to contracts in which LP agrees 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 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. LP cannot estimate the potential amount of future payments under these agreements until events arise that would trigger the liability. See Note 21 of the Notes to the financial statements included in LP’s Annual Report on Form 10-K for the year ended December 31, 2012 for further discussion of LP’s guarantees and indemnifications.

LP provides warranties on the sale of most of its 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 first nine months of 2013 and 2012 are summarized in the following table:



	Quarter Ended September 30,						Nine Months Ended September 30,
Dollar amounts in millions	2013			2012			2013			2012
Beginning balance	$	21.0		$	26.5		$	21.4		$	30.3
Accrued to expense	0.4			0.4			0.7			0.9
Adjusted to other operating credits and charges	2.0			1.0			6.1			1.0
Payments made	(3.8		)	(4.5		)	(8.6		)	(8.8		)
Total warranty reserves	19.6			23.4			19.6			23.4
Current portion of warranty reserves	(12.0		)	(12.0		)	(12.0		)	(12.0		)
Long-term portion of warranty reserves	$	7.6		$	11.4		$	7.6		$	11.4

LP increased the warranty reserves related to CanExel siding products by $2.0 million and $6.1 million for the third quarter and the first nine months of 2013. The additional reserves reflect revised estimates of future claim payments based upon an increase in Canexel warranty claims related to a specific geographic location and for a specific time period. LP continues to monitor warranty and other claims associated with these products and believes as of September 30, 2013 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 LP’s Condensed Consolidated Balance Sheets.

Other Comprehensive Income Other Comprehensive Income (Notes)

9 Months Ended

Sep. 30, 2013

Other Comprehensive Income [Abstract]

Comprehensive Income (Loss) Note

OTHER COMPREHENSIVE INCOME

In February 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2013-02 "Reporting of Amounts Reclassified Out of Accumulated Comprehensive Income." The amendments do not change the current requirement for reporting net income or other comprehensive income in financial statements; however, the amendment requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. The new disclosure requirements were effective for all periods beginning after December 15, 2012 and adopted by LP effective January 1, 2013. The adoption of the amendments concerns presentation and disclosure only and did not have an impact on LP's consolidated financial statements.

Other comprehensive income activity, net of tax, is provided in the following table for the quarter ended September 30, 2013:



Dollar amounts in millions	Foreign currency translation adjustments			Pension adjustments			Unrealized gain (loss) on derivative instruments			Unrealized gain (loss) on investments			Other			Total
Balance at June 30, 2013	$	(14.7	)	$	(96.0	)	$	(0.3	)	$	2.2		$	(2.0	)	$	(110.8	)
Other comprehensive income before reclassifications	0.3			2.3			(0.1		)	(0.2		)	—			$	2.3
Amounts reclassified from accumulated comprehensive income	—			(1.3		)	—			—			—			$	(1.3	)
Net current-period other comprehensive income	0.3			1.0			(0.1		)	(0.2		)	—			1.0
Balance at September 30, 2013	$	(14.4	)	$	(95.0	)	$	(0.4	)	$	2.0		$	(2.0	)	$	(109.8	)

Reclassifications from accumulated other comprehensive loss for the quarter ended September 30, 2013 are summarized, in millions of dollars, in the following table:



Details about accumulated other comprehensive income components	Amount reclassified from accumulated comprehensive income			Affected line item in the statement where net income (loss) is presented
Amortization of defined benefit pension plans
Prior service cost	$	0.1		^(a)
Actuarial loss	1.8			^(a)
Transition obligation	(0.1		)	^(a)
	1.8			Total before tax
	0.5			Tax (provision) benefit
Total reclassifications for the quarter ended September 30, 2013	$	1.3		Net of tax

____________

^(a)These accumulated other comprehensive income components are included in the computation of net periodic pension cost, see Note 16 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.

Other comprehensive income activity, net of tax, is provided in the following table for the nine months ended September 30, 2013:



Dollar amounts in millions	Foreign currency translation adjustments			Pension adjustments			Unrealized gain (loss) on derivative instruments			Unrealized gain (loss) on investments		Other			Total
Balance at December 31, 2012	$	(7.6	)	$	(99.0	)	$	(0.3	)	$	1.0	$	(2.0	)	$	(107.9	)
Other comprehensive income before reclassifications	(6.8		)	8.0			(0.1		)	1.0		—			2.1
Amounts reclassified from accumulated comprehensive income	—			(4.0		)	—			—		—			(4.0		)
Net current-period other comprehensive income	(6.8		)	4.0			(0.1		)	1.0		—			(1.9		)
Balance at September 30, 2013	$	(14.4	)	$	(95.0	)	$	(0.4	)	$	2.0	$	(2.0	)	$	(109.8	)

Reclassifications from accumulated other comprehensive loss for the nine months ended September 30, 2013 are summarized, in millions of dollars, in the following table:



Details about accumulated other comprehensive income components	Amount reclassified from accumulated comprehensive income			Affected line item in the statement where net income (loss) is presented
Amortization of defined benefit pension plans
Prior service cost	$	0.2		^(a)
Actuarial loss	5.5			^(a)
Transition obligation	(0.2		)	^(a)
	5.5			Total before tax
	1.5			Tax (provision) benefit
Total reclassifications for the nine months ended September 30, 2013	$	4.0		Net of tax

____________

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

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+ Details

Business Combinations (Notes)	9 Months Ended
Business Combinations (Notes)	Sep. 30, 2013
Business Combinations [Abstract]
Business Combination Disclosure [Text Block]	On May 31, 2013, LP acquired full control of the Peace Valley OSB joint venture in which LP previously maintained a 50% interest. Peace Valley OSB's results of operations have been fully consolidated in all periods subsequent to May 31, 2013. Since LP previously served as the exclusive distributor of all OSB produced by this venture, this acquisition will not have a material impact on LP's consolidated net sales. Due to the pre-existing 50% ownership interest in Peace Valley OSB, this acquisition was accounted for as a step acquisition in accordance with ASC 805, Business Combinations (“ASC 805”). Accordingly, LP recognized a gain of $35.9 million in connection with this transaction to record its 50% ownership interest in Peace Valley at fair value on the acquisition date. The fair value of LP's existing 50% interest ($95.9 million) was determined using a combination of the income and market approach. In completing this valuation, management considered future earnings and cash flow potential of the business, earnings multiples, and recent market transactions of similar businesses. This gain is included in "Non-operating income (expense)." The purchase price of the 50% acquired interest was $74.6 million (including working capital) paid in cash. Additionally, as part of the purchase consideration, LP agreed to pay contingent consideration equal to a pre-defined percentage of the operation's earnings before interest, taxes, depreciation and amortization (EBITDA) over a pre-defined threshold for each of the next three years. As of May 31, 2013, the fair value of the contingent consideration payable was valued at $24.3 million and was recorded in “accounts payable and accrued liabilities” and “other long term liabilities”. The fair value of the contingent consideration payable will be remeasured at the end of each reporting period. During the third quarter of 2013, the fair value of the contingent consideration payable was remeasured and reduced by $17.3 million due to the decline in projected OSB prices and therefore resulting reduction in the estimated EBITDA of the operation. Including the 50% interest previously owned by LP, LP acquired net assets of $194.8 million, consisting of $22.7 million in current assets, $146.4 million in fixed asset, $43.8 million of intangible assets (comprised of $34.1 million of timber licenses and $9.7 million of goodwill) and $8.7 million in current liabilities and $9.4 million in long term liabilities. Certain information about Peace Valley OSB (e.g., pro forma financial information and allocation of purchase price) is not presented because such information is not material to LP's results of operations and financial position. While LP uses its best estimates and assumptions as part of the purchase price allocation process to value assets acquired and liabilities assumed at the business combination date, its estimates and assumptions are subject to refinement. As a result, during the preliminary purchase price allocation period, which may be up to one year from the business combination date, LP may record adjustments to the assets acquired and liabilities assumed with a corresponding offset to goodwill. LP will record adjustments to assets acquired or liabilities assumed subsequent to the measurement period in its operating results in the period in which the adjustments were determined.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

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+ Details

Proposed Acquisition of Ainsworth Lumber Co Ltd (Notes)	9 Months Ended
Proposed Acquisition of Ainsworth Lumber Co Ltd (Notes)	Sep. 30, 2013
Proposed Acquisition [Abstract]
Proposed Acquisition [Text Block]	PROPOSED ACQUISITION OF AINSWORTH LUMBER CO. LTD. LP announced that it signed an Arrangement Agreement (the “Arrangement Agreement”) with Ainsworth Lumber Co. Ltd., a British Columbia corporation (“Ainsworth”), providing an arrangement under British Columbia law whereby a wholly owned subsidiary of the Company will acquire all of the outstanding shares of Ainsworth capital stock in exchange for 0.114 shares of LP common stock (“LP Shares”) and C$1.94 in cash per Ainsworth common share (“Ainsworth Shares”) subject to certain terms and conditions. Although the Arrangement Agreement provides for Ainsworth shareholders to elect among cash consideration, share consideration and mixed consideration, proration provisions will ensure that the aggregate amounts of cash and LP Shares issued in the Transaction are fixed at approximately C$467.0 million and 27.5 million LP Shares, respectively. On November 1, 2013, we entered into a commitment letter (the "Commitment Letter") with American AgCredit, FLCA ("AAC"), CoBank, ACB ("CoBank"), Farm Credit Services of America, PCA ("FCSA"), and AgFirst Farm Credit Bank ("AgFirst") pursuant to which AAC and FCSA (collectively, the "Lenders") have severally committed to provide senior secured revolving financing to the Company in an aggregate amount of up to $200 million on the terms and subject to the conditions set forth therein. The proceeds of the facility will be used by us to fund a portion of the purchase price for the previously announced acquisition (the "Acquisition") by the Company of Ainsworth Lumber Company Ltd. ("Ainsworth") and will otherwise be available for working capital purposes. The obligations of the Lenders to provide such financing are subject to the execution and delivery of mutually acceptable definitive loan documents, which are expected to contain customary representations, warranties, covenants and events of default, including a minimum liquidity covenant and a maximum capitalization ratio covenant. The commitments of the Lenders will expire on, and definitive loan documents must be executed and delivered by, December 2, 2013. The consummation of the Acquisition is not a condition to the closing of the financing. As of November 5, 2013, LP anticipates the Transaction to be completed in either late fourth quarter of 2013 or early first quarter 2014, subject to the receipt of required regulatory approvals.

Goodwill and Other Intangible Assets (Notes)

3 Months Ended

9 Months Ended

Sep. 30, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets [Table Text Block]

LP has recorded other intangible assets in its Consolidated Balance Sheets, as follows:



Dollar amounts in millions	September 30, 2013		December 31, 2012
Timber licenses (recorded as part of Timber and timberlands)	$	69.0	$	36.6
Customer relationships, net of amortization	—		0.5
Other	0.1		0.1
Total	$	69.1	$	37.2

Customer relationships and other intangibles are included in Other assets in the Consolidated Balance Sheet.

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



Dollar amounts in millions
2013	$	2.9
2014	2.9
2015	3.6
2016	3.6
2017	3.6

During the second quarter of 2013, LP completed the acquisition of the Peace Valley OSB joint venture. The acquisition resulted in the recognition of $9.7 million of goodwill and included timber licenses of $34.1 million. See Note 19 for further discussion.

Discontinued Operations (Notes)

9 Months Ended

Sep. 30, 2013

Discontinued Operations [Abstract]

Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]

DISCONTINUED OPERATIONS

Over the last several years, LP has adopted and implemented plans to sell selected businesses and assets in order to improve its 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.

During the third quarter of 2013, LP sold its moulding operations. Sales and operating profit included in discontinued operations are as follows:



Dollars amounts in millions	Quarter Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Sales	$	4.1	$	5.8	$	16.1	$	20.2
Operating profit	1.0		0.5		1.6		2.8

A gain of $1.7 million on the sale of the moulding operations was recognized in the third quarter of 2013, and is included in discontinued operations on the Consolidated Statement of Income.

- Definition

The entire disclosure for the facts and circumstances leading to the completed or expected disposal, manner and timing of disposal, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the segment in which the disposal group was reported, and the classification (whether sold or classified as held for sale) and carrying value of the assets and liabilities comprising the disposal group. Includes all disposal groups, including those classified as components of the entity (discontinued operations).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1436-107760

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1012-107759

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
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-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230

+ Details

Other Comprehensive Income New Accounting Pronouncements (Policies)	3 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]
New Accounting Pronouncements and Changes in Accounting Principles	In February 2013, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2013-02 "Reporting of Amounts Reclassified Out of Accumulated Comprehensive Income." The amendments do not change the current requirement for reporting net income or other comprehensive income in financial statements; however, the amendment requires an entity to provide information about the amounts reclassified out of accumulated other comprehensive income by component. The new disclosure requirements were effective for all periods beginning after December 15, 2012 and adopted by LP effective January 1, 2013. The adoption of the amendments concerns presentation and disclosure only and did not have an impact on LP's consolidated financial statements.

- Definition

The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6507316

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6510796

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Indirect Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6515603

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.10-01.(b)(6))
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6503790

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Retrospective Application
-URI http://asc.fasb.org/extlink&oid=6523989

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 01
-Paragraph b
-Subparagraph 6
-Article 10

+ Details

Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2013

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

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



	2013	2012
Expected stock price volatility	69.2%	63.6%
Expected dividend yield	—%	—%
Risk-free interest rate	0.9%	0.7%
Expected life of options	5 years	5 years
Weighted average fair value of options and SSARs granted	$11.68	$4.75

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

The following table summarizes stock options and SSARs outstanding as of September 30, 2013, as well as activity during the nine month period then ended.



Share amounts in thousands	Options and SSARs		Weighted Average Exercise Price		Weighted Average Contractual Term (in years)	Aggregate Intrinsic Value (in millions)
Options / SSARs outstanding at January 1, 2013	8,475		$	12.88
SSARs granted	343		20.49
Options / SSARs exercised	(1,854	)	9.03
Options /SSARs canceled	—		—
Options/SSARs outstanding at September 30, 2013	6,964		$	14.28	5.2	$	37.4
Vested and expected to vest at September 30, 2013	6,615		—		—	$	35.5
Options/SSARS exercisable at September 30, 2013	5,724		$	14.72	—	$	29.9

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

The following table summarizes incentive share awards outstanding as of September 30, 2013 as well as activity during the nine months then ended.



	Shares		Weighted Average Contractual Term (in years)	Aggregate Intrinsic Value (in millions)
Incentive share awards outstanding at January 1, 2013	960,388
Incentive share awards granted	158,474
Incentive share awards vested	(346,107	)
Incentive share awards canceled	(478	)
Incentive shares outstanding at September 30, 2013	772,277		1.1	$	13.5
Vested and expected to vest at September 30, 2013	733,663		—	$	12.8

Restricted Stock Activity [Table Text Block]

The following table summarizes the restricted stock outstanding as of September 30, 2013 as well as activity during the nine months then ended.



	Number of Shares		Weighted Average Grant Date Fair Value
Restricted stock awards outstanding at January 1, 2013	556,987		$	8.51
Restricted stock awards granted	108,174		20.49
Restrictions lapsed	(205,739	)	7.00
Restricted stock awards at September 30, 2013	459,422		$	12.01

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

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

The following table summarizes assets and liabilities measured on a recurring basis for each of the three hierarchy levels presented below.



Dollar amounts in millions	September 30, 2013		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	$	3.8	$	—	$	—	$	3.8
Trading securities	2.0		2.0		—		—
Contingent consideration	7.2		—		—		7.2
Total	$	13.0	$	2.0	$	—	$	11.0
Dollar amounts in millions	December 31, 2012		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	$	2.0	$	—	$	—	$	2.0
Trading securities	1.7		1.7		—		—
Total	$	3.7	$	1.7	$	—	$	2.0

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



Dollar amounts in millions	Available for sale securities		Contingent consideration
Balance at December 31, 2011	$	0.7	$	—
Total realized/unrealized gains included in other comprehensive income	1.1		—
Balance at September 30, 2012	$	1.8	$	—

Balance at December 31, 2012	$	2.0	$	—
Contingent consideration pursuant to business combination (see Note 19)	—		24.3
Adjustment to contingent consideration fair value	—		(17.3		)
Total realized/unrealized gains included in other comprehensive income	1.8		—
Foreign currency gain	—		0.2
Balance at September 30, 2013	$	3.8	$	7.2

Earnings per Share (Tables)

9 Months Ended

Sep. 30, 2013

Earnings Per Share [Abstract]

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:



Dollar and share amounts in millions, except per share amounts	Quarter Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Numerator:
Income (loss) attributed to LP common shares:
Income (loss) from continuing operations	$	37.5	$	31.0	$	196.5	$	(19.1	)
Income from discontinued operations	0.6		0.3		1.0		1.8
Net income (loss)	$	38.1	$	31.3	$	197.5	$	(17.3	)
Denominator:
Basic - weighted average common shares outstanding	140.0		137.1		139.1		136.9
Dilutive effect of stock warrants	1.8		3.0		2.5		—
Dilutive effect of stock plans	2.2		2.5		2.5		—
Diluted shares outstanding	144.0		142.6		144.1		136.9
Basic earnings per share:
Income (loss) from continuing operations	$	0.27	$	0.23	$	1.41	$	(0.14	)
Income from discontinued operations	—		—		0.01		0.01
Net income (loss) per share	$	0.27	$	0.23	$	1.42	$	(0.13	)
Diluted earnings per share:
Income (loss) from continuing operations	$	0.26	$	0.22	$	1.36	$	(0.14	)
Income from discontinued operations	—		—		0.01		0.01
Net income (loss) per share	$	0.26	$	0.22	$	1.37	$	(0.13	)

Receivables (Tables)

9 Months Ended

Sep. 30, 2013

Receivables [Abstract]

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

Receivables consist of the following:



Dollar amounts in millions	September 30, 2013			December 31, 2012
Trade receivables	$	102.1		$	76.0
Interest receivables	0.7			0.8
Income tax receivable	0.8			1.8
Other receivables	6.7			5.2
Allowance for doubtful accounts	(1.1		)	(1.1		)
Total	$	109.2		$	82.7

Inventories (Tables)

9 Months Ended

Sep. 30, 2013

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]



Dollar amounts in millions	September 30, 2013			December 31, 2012
Logs	$	42.9		$	37.6
Other raw materials	20.3			17.7
Finished products	148.5			142.7
Supplies	14.3			12.8
LIFO reserve	(1.0		)	(1.0		)
Total	$	225.0		$	209.8

Assets Held for Sale (Tables)

9 Months Ended

Sep. 30, 2013

Property, Plant and Equipment Assets Held-for-sale Disclosure [Abstract]

Disclosure of Long Lived Assets Held-for-sale [Table Text Block]

The current book values of assets held for sale by category is as follows:



Dollars in millions	September 30, 2013			December 31, 2012
Property, plant and equipment, at cost:
Land, land improvements and logging roads, net of road amortization	$	9.9		$	10.0
Buildings	15.6			17.1
Machinery and equipment	140.7			140.8
	166.2			167.9
Accumulated depreciation	(134.8		)	(135.4		)
Net property, plant and equipment	$	31.4		$	32.5

Income Taxes (Tables)

9 Months Ended

Sep. 30, 2013

Income Tax Disclosure [Abstract]

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

The income tax components and associated effective income tax rates for the quarter and nine months ended September 30, 2013 and 2012 are as follows:



	Quarter Ended September 30,
	2013				2012
Dollars in millions	Tax Provision		Tax Rate		Tax Provision			Tax Rate
Continuing operations	$	4.4	11	%	$	7.7		20	%
Discontinued operations	0.4		35	%	0.2			35	%
	$	4.8	11	%	$	7.9		20	%

	Nine Months Ended September 30,
	2013				2012
	Tax Provision		Tax Rate		Tax Provision/(Benefit)			Tax Rate
Continuing operations	$	51.6	21	%	$	(5.6	)	23	%
Discontinued operations	0.6		35	%	1.0			35	%
	$	52.2	21	%	$	(4.6	)	21	%

Long-term Debt (Tables)

9 Months Ended

Sep. 30, 2013

Debt Disclosure [Abstract]

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

LP’s long-term debt consists of the following:



Dollars in millions	September 30, 2013			December 31, 2012
Debentures:
Senior notes, maturing 2020	$	350.0		$	350.0
Bank credit facilities:
Chilean term credit facility, maturing 2019, denominated in UF	16.2			39.3
Brazilian export financing facility, maturing 2017	8.0			10.0
Limited recourse notes payable:
Senior notes, payable 2013 - 2018	22.0			112.0
Other financing
Non-recourse notes, payable 2018	368.7			368.7
Other	0.7			0.5
Total	765.6			880.5
Less: current portion	(2.3		)	(97.8		)
Net long-term portion	$	763.3		$	782.7

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

Other Operating Credits and Charges, Net (Tables)

9 Months Ended

Sep. 30, 2013

Other Operating Credits And Charges, Net [Abstract]

Other Operating Credits and Charges Net [Table Text Block]



	Quarter Ended September 30,						Nine Months Ended September 30,
Dollar amounts in millions	2013			2012			2013			2012
Other operating charges and credits net:
Adjustment related to prior year inventory	$	—		$	—		$	(1.6	)	$	—
Adjustment related to prior year depreciation	—			—			(1.5		)	—
Construction related legal reserve	—			—			—			0.5
Addition to warranty reserves	(2.0		)	(1.0		)	(6.1		)	(1.0		)
Refundable value added tax receivable	1.4			—			1.4			—
Insurance recovery	0.4			—			0.4			—
Contingent consideration fair value adjustment	17.3			—			17.3			—
Addition to workers compensation reserves	(1.0		)	—			(1.0		)	—
Other	—			(0.2		)	0.2			(0.7		)
	$	16.1		$	(1.2	)	$	9.1		$	(1.2	)
Other operating charges and credits associated with unconsolidated affiliates:
Valuation allowance associated with deferred taxes	$	—		$	—		$	(1.8	)	$	—
Addition to contingency reserves	—			—			(0.9		)	—
	$	—		$	—		$	(2.7	)	$	—

Selected Segment Data (Tables)

9 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

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



	Quarter Ended September 30,						Nine Months Ended September 30,
Dollar amounts in millions	2013			2012			2013			2012
Net sales:
OSB	$	245.4		$	226.6		$	838.3		$	571.0
Siding	149.0			134.1			435.5			384.2
Engineered Wood Products	71.8			61.5			196.1			161.8
South America	41.5			42.0			130.9			127.1
Other	3.9			3.4			10.3			10.1
Intersegment sales	(4.2		)	(5.5		)	(5.6		)	(16.9		)
	$	507.4		$	462.1		$	1,605.5		$	1,237.3
Operating profit (loss):
OSB	$	30.2		$	49.3		$	223.7		$	66.0
Siding	22.5			20.3			70.3			56.4
Engineered Wood Products	(2.0		)	(3.0		)	(10.6		)	(9.3		)
South America	5.3			4.5			17.8			11.2
Other	(2.1		)	(2.6		)	(6.1		)	(7.8		)
Other operating credits and charges, net	16.1			(1.2		)	9.1			(1.2		)
Other operating credits and charges associated with unconsolidated affiliates	—			—			(2.7		)	—
Gain (loss) on sale or impairment of long-lived assets	(0.3		)	(4.3		)	0.4			(4.5		)
Gain on acquisition	—			—			35.9			—
Early debt extinguishment	(0.8		)	—			(0.8		)	(52.2		)
General corporate and other expenses, net	(22.1		)	(18.1		)	(65.9		)	(56.3		)
Foreign currency gain (loss)	1.0			0.4			(3.3		)	(2.3		)
Investment income	1.7			4.1			8.3			11.7
Interest expense, net of capitalized interest	(7.6		)	(10.7		)	(28.0		)	(36.4		)
Income (loss) from continuing operations before taxes	41.9			38.7			248.1			(24.7		)
Provision (benefit) for income taxes	4.4			7.7			51.6			(5.6		)
Income (loss) from continuing operations	$	37.5		$	31.0		$	196.5		$	(19.1	)

Contingency Reserves (Tables)

9 Months Ended

Sep. 30, 2013

Commitments and Contingencies Disclosure [Abstract]

Schedule of Loss Contingencies by Contingency [Table Text Block]

LP maintains reserves for various contingent liabilities as follows:



Dollar amounts in millions	September 30, 2013			December 31, 2012
Environmental reserves	$	13.9		$	14.1
Other reserves	0.5			0.7
Total contingency reserves	14.4			14.8
Current portion of contingency reserves	(2.0		)	(2.0		)
Long-term portion of contingency reserves	$	12.4		$	12.8

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14472-108349

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-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12021-110248

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14453-108349

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12053-110248

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14394-108349

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14615-108349

+ Details

Defined Benefit Pension Plans (Tables)

9 Months Ended

Sep. 30, 2013

Compensation and Retirement Disclosure [Abstract]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

The net periodic pension cost included the following components:



	Quarter Ended September 30,						Nine Months Ended September 30,
Dollar amounts in millions	2013			2012			2013			2012
Service cost	$	0.8		$	0.9		$	2.5		$	2.7
Interest cost	3.2			3.7			9.7			11.0
Expected return on plan assets	(4.1		)	(4.3		)	(12.4		)	(12.7		)
Amortization of prior service cost	0.1			0.1			0.2			0.2
Amortization of net loss	1.8			1.7			5.5			5.0
Net periodic pension cost	$	1.8		$	2.1		$	5.5		$	6.2

Guarantees and Indemnifications (Tables)

9 Months Ended

Sep. 30, 2013

Commitments and Contingencies Disclosure [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

The activity in warranty reserves for the first nine months of 2013 and 2012 are summarized in the following table:



	Quarter Ended September 30,						Nine Months Ended September 30,
Dollar amounts in millions	2013			2012			2013			2012
Beginning balance	$	21.0		$	26.5		$	21.4		$	30.3
Accrued to expense	0.4			0.4			0.7			0.9
Adjusted to other operating credits and charges	2.0			1.0			6.1			1.0
Payments made	(3.8		)	(4.5		)	(8.6		)	(8.8		)
Total warranty reserves	19.6			23.4			19.6			23.4
Current portion of warranty reserves	(12.0		)	(12.0		)	(12.0		)	(12.0		)
Long-term portion of warranty reserves	$	7.6		$	11.4		$	7.6		$	11.4

Other Comprehensive Income Other Comprehensive Income (Tables)

3 Months Ended

9 Months Ended

Sep. 30, 2013

Accumulated Other Comprehensive Income [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 quarter ended September 30, 2013:



Dollar amounts in millions	Foreign currency translation adjustments			Pension adjustments			Unrealized gain (loss) on derivative instruments			Unrealized gain (loss) on investments			Other			Total
Balance at June 30, 2013	$	(14.7	)	$	(96.0	)	$	(0.3	)	$	2.2		$	(2.0	)	$	(110.8	)
Other comprehensive income before reclassifications	0.3			2.3			(0.1		)	(0.2		)	—			$	2.3
Amounts reclassified from accumulated comprehensive income	—			(1.3		)	—			—			—			$	(1.3	)
Net current-period other comprehensive income	0.3			1.0			(0.1		)	(0.2		)	—			1.0
Balance at September 30, 2013	$	(14.4	)	$	(95.0	)	$	(0.4	)	$	2.0		$	(2.0	)	$	(109.8	)

Other comprehensive income activity, net of tax, is provided in the following table for the nine months ended September 30, 2013:



Dollar amounts in millions	Foreign currency translation adjustments			Pension adjustments			Unrealized gain (loss) on derivative instruments			Unrealized gain (loss) on investments		Other			Total
Balance at December 31, 2012	$	(7.6	)	$	(99.0	)	$	(0.3	)	$	1.0	$	(2.0	)	$	(107.9	)
Other comprehensive income before reclassifications	(6.8		)	8.0			(0.1		)	1.0		—			2.1
Amounts reclassified from accumulated comprehensive income	—			(4.0		)	—			—		—			(4.0		)
Net current-period other comprehensive income	(6.8		)	4.0			(0.1		)	1.0		—			(1.9		)
Balance at September 30, 2013	$	(14.4	)	$	(95.0	)	$	(0.4	)	$	2.0	$	(2.0	)	$	(109.8	)

Disclosure of Reclassification Amount [Text Block]

Reclassifications from accumulated other comprehensive loss for the quarter ended September 30, 2013 are summarized, in millions of dollars, in the following table:



Details about accumulated other comprehensive income components	Amount reclassified from accumulated comprehensive income			Affected line item in the statement where net income (loss) is presented
Amortization of defined benefit pension plans
Prior service cost	$	0.1		^(a)
Actuarial loss	1.8			^(a)
Transition obligation	(0.1		)	^(a)
	1.8			Total before tax
	0.5			Tax (provision) benefit
Total reclassifications for the quarter ended September 30, 2013	$	1.3		Net of tax

____________

Reclassifications from accumulated other comprehensive loss for the nine months ended September 30, 2013 are summarized, in millions of dollars, in the following table:



Details about accumulated other comprehensive income components	Amount reclassified from accumulated comprehensive income			Affected line item in the statement where net income (loss) is presented
Amortization of defined benefit pension plans
Prior service cost	$	0.2		^(a)
Actuarial loss	5.5			^(a)
Transition obligation	(0.2		)	^(a)
	5.5			Total before tax
	1.5			Tax (provision) benefit
Total reclassifications for the nine months ended September 30, 2013	$	4.0		Net of tax

____________

- Definition

The entire disclosure for any adjustments made during the period to avoid double counting in comprehensive income items displayed as part of net income that also had been displayed as part of other comprehensive income in that period or earlier periods. These adjustments include reclassifications to net income of items in accumulated comprehensive income, such as deferred gains or losses on qualifying hedges when hedged item reported in net income, holding gains or losses on available-for-sale securities transferred into trading category, unrealized holding gains or losses on debt securities transferred from held-to-maturity category into available-for-sale category and accumulated translation adjustment attributable to foreign subsidiary or investment in foreign entity upon sale or liquidation.

+ References + Details

Goodwill and Other Intangible Assets (Tables)

3 Months Ended

9 Months Ended

Sep. 30, 2013

Goodwill [Line Items]

Goodwill and Intangible Assets Disclosure [Text Block]

GOODWILL AND OTHER INTANGIBLE ASSETS

Changes in goodwill for the third quarter and the nine months ended September 30, 2013 are provided in the following table:



Dollar amounts in millions	2013
Beginning balance, December 31, 2012	$	—
Additions	9.7
Total goodwill	$	9.7

LP has recorded other intangible assets in its Consolidated Balance Sheets, as follows:



Dollar amounts in millions	September 30, 2013		December 31, 2012
Timber licenses (recorded as part of Timber and timberlands)	$	69.0	$	36.6
Customer relationships, net of amortization	—		0.5
Other	0.1		0.1
Total	$	69.1	$	37.2

Customer relationships and other intangibles are included in Other assets in the Consolidated Balance Sheet.

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



Dollar amounts in millions
2013	$	2.9
2014	2.9
2015	3.6
2016	3.6
2017	3.6

Goodwill and Intangible Assets Disclosure [Text Block]

Changes in goodwill for the third quarter and the nine months ended September 30, 2013 are provided in the following table:



Dollar amounts in millions	2013
Beginning balance, December 31, 2012	$	—
Additions	9.7
Total goodwill	$	9.7

Schedule of Finite-Lived Intangible Assets [Table Text Block]

LP has recorded other intangible assets in its Consolidated Balance Sheets, as follows:



Dollar amounts in millions	September 30, 2013		December 31, 2012
Timber licenses (recorded as part of Timber and timberlands)	$	69.0	$	36.6
Customer relationships, net of amortization	—		0.5
Other	0.1		0.1
Total	$	69.1	$	37.2

Customer relationships and other intangibles are included in Other assets in the Consolidated Balance Sheet.

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



Dollar amounts in millions
2013	$	2.9
2014	2.9
2015	3.6
2016	3.6
2017	3.6

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Discontinued Operations (Tables)

9 Months Ended

Sep. 30, 2013

Discontinued Operations [Abstract]

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

Sales and operating profit included in discontinued operations are as follows:



Dollars amounts in millions	Quarter Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Sales	$	4.1	$	5.8	$	16.1	$	20.2
Operating profit	1.0		0.5		1.6		2.8

Stock-Based Compensation (Details) $ in Millions	3 Months Ended	9 Months Ended
Stock-Based Compensation (Details) $ in Millions	Sep. 30, 2013 USD ($)	Sep. 30, 2013 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SSARS Expiration Date	P10Y
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense		$ 2.0
Unrecognized compensation costs	$ 3.9	$ 3.9
Weighted-average period of years costs are expected to be recognied over		1 year 1 month 6 days
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense		$ 0.3
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense		1.3
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period	3 years
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Starting Term When Options Become Exercisable After Grant Date	3 months
Director [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of months for options to vest at an incremental rate of ten percent for directors	3 months
Director [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	$ 2.9	$ 2.9
Weighted-average period of years costs are expected to be recognied over		1 year 3 months 18 days
Chief Executive Officer [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	$ 0.9	$ 0.9
Weighted-average period of years costs are expected to be recognied over		2 years 7 months 6 days

Stock-Based Compensation Valuation Assumptions (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation related to stock plans	$ 2.4	$ 1.8	$ 6.6	$ 6.4
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period	3 years
Options and SSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected sock price volatility		63.60%	69.20%
Expected dividend yield		0.00%	0.00%
Risk-free interest rate		0.70%	0.90%
Expected life of options		5 years	5 years
Weighted average fair value of options and SSARs granted		$ 4.75	$ 11.68

Stock-Based Compensation Outstanding Options and SSARs (Details) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2013 USD ($) $ / shares shares	Sep. 30, 2013 USD ($) years $ / shares shares	Dec. 31, 2012 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Options / SSARs outstanding at January 1, 2012		8,475
Incentive shares granted		343
Options / SSARs exercised		(1,854)
Options / SSARs cancelled		0
Options / SSARs outstanding at September 30, 2012	6,964	6,964
Options / SSARs outstanding Weighted Average Exercise Price \| $ / shares	$ 14.28	$ 14.28	$ 12.88
SSARs granted Weighted Average Exercise Price \| $ / shares	20.49	20.49
Options / SSARs exercised Weighted Average Exercise Price \| $ / shares	9.03	9.03
Options / SSARs cancelled Weighted Average Exercise Price \| $ / shares	$ 0.00	$ 0.00
Options / SSARs outstanding Weighted Average Contractual Term (in years) \| years		5.2
Options / SSARs outstanding Aggregate Intrinsic Value (in millions) \| $	$ 37.4	$ 37.4
Vested and expected to vest	6,615	6,615
Vested and expected to vest Aggregate Intrinsic Value (in millions) \| $	$ 35.5	$ 35.5
Options / SSARs exercisable	5,724	5,724
Options / SSARs exercisable Weighted Average Exercise Price \| $ / shares	$ 14.72	$ 14.72
Options / SSARs exercisable Aggregate Intrinsic Value (in millions) \| $	$ 29.9	$ 29.9
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Starting Term When Options Become Exercisable After Grant Date	3 months
Employee Stock Option [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of months for options to vest at an incremental rate of ten percent for directors	3 months
Options and SSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Weighted-average period of years costs are expected to be recognied over	1 year 4 months 24 days
Compensation Expense \| $		2.5
Unrecognized compensation costs \| $	$ 5.0	$ 5.0
Number of Shares Available for Grant	5,600	5,600
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vesting Period	3 years

Stock-Based Compensation Restricted Stock Units (Details) $ in Millions	9 Months Ended
	Sep. 30, 2013 USD ($) years shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive shares granted	343,000
Incentive shares ouststanding Aggregate Intrinsic Value (in millions) \| $	$ 37.4
Director restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense \| $	0.2
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense \| $	$ 2.0
Incentive share awards outstanding at January 1, 2012	960,388
Incentive shares granted	158,474
Incentive share awards vested	(346,107)
Incentive share awards cancelled	(478)
Incentive shares outstanding at September 30, 2012	772,277
Incentive share awards outstanding Weighted Average Contractual Term (in years)	1 year 1 month 6 days
Incentive shares ouststanding Aggregate Intrinsic Value (in millions) \| $	$ 13.5
Vested and expected to vest at September 30, 2012	733,663
Vested and expected to vest Weighted Average Contractual Term (in years) \| years	0.00
Vested and expected to vest Aggregate Intrinsic Value (in millions) \| $	$ 12.8
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense \| $	$ 1.3
Incentive shares outstanding at September 30, 2012	459,422
Director [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive share awards outstanding at January 1, 2012	556,987
Incentive shares granted	108,174
Incentive share awards cancelled	(205,739)
Incentive shares outstanding at September 30, 2012	93,179
Chief Executive Officer [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive shares outstanding at September 30, 2012	300,000

Stock-Based Compensation Restricted and Phantom Stock (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2013 USD ($) $ / shares shares	Dec. 31, 2012 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted stock awards granted	343,000
Phantom Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense \| $	$ 0.3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Incentive shares outstanding at September 30, 2012	75,816
Phantom Stock [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number Of Units Of Phantom Stock Used As Basis For Market Value Of Common Stock On Vesting Date	1,000,000
Number Of Units Of Common Stock Used To Measure Value Of Phantom Stock On Vesting Date	1,000,000
Years phantom stock vests over	5 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense \| $	$ 1.3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Incentive shares outstanding at September 30, 2012	459,422
Restricted Stock [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs \| $	$ 2.9
Weighted-average period of years costs are expected to be recognied over	1 year 3 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Incentive share awards outstanding at January 1, 2012	556,987
Restricted stock awards granted	108,174
Restrictions lapsed	(205,739)
Incentive shares outstanding at September 30, 2012	93,179
Restricted stock awards outstanding \| $ / shares	$ 12.01	$ 8.51
Restricted stock awards granted Weighted Average Grate Date Fair Value \| $ / shares	20.49
Restrictions lapsing Weighted Average Grant Date Fair Value \| $ / shares	$ 7.00
Restricted Stock [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs \| $	$ 0.9
Weighted-average period of years costs are expected to be recognied over	2 years 7 months 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Incentive shares outstanding at September 30, 2012	300,000

Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 3.8		$ 2.0	$ 1.8	$ 0.7
Assets, Fair Value Disclosure [Abstract]
Business Combination, Contingent Consideration, Liability	7.2	$ 24.3
Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Available for sale securities	3.8		2.0
Trading securities	2.0		1.7
Business Combination, Contingent Consideration, Liability	(7.2)
Total	13.0		3.7
Fair Value, Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets, Fair Value Disclosure [Abstract]
Available for sale securities	0.0		0.0
Trading securities	2.0		1.7
Business Combination, Contingent Consideration, Liability	0.0
Total	2.0		1.7
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Available for sale securities	0.0		0.0
Trading securities	0.0		0.0
Business Combination, Contingent Consideration, Liability	0.0
Total	0.0		0.0
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Available for sale securities	3.8		2.0
Trading securities	0.0		0.0
Business Combination, Contingent Consideration, Liability	(7.2)
Total	$ 11.0		$ 2.0

Fair Value Measurements Unobservable Inputs Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Business Combination, Contingent Consideration, Liability	$ 7.2		$ 7.2		$ 24.3
Adjustment to contingent consideration fair value	(17.3)	$ 0.0	17.3	$ 0.0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			2.0	0.7
Total realized/unrealized gains (losses) Included in other comprehensive income	1.8	1.1
Ending balance	3.8	$ 1.8	$ 3.8	$ 1.8
Foreign Currency Transaction Gain (Loss), Unrealized	$ 0.2

Fair Value Measurements Impairment losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Adjustment to contingent consideration fair value	$ (17.3)	$ 0.0	$ 17.3	$ 0.0
Fair Value, Inputs, Level 2 [Member]
Schedule of Available-for-sale Securities [Line Items]
Impairment of Long-Lived Assets to be Disposed of		$ 4.4

Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income (loss) attributed to LP common shares [Abstract]
Income (loss) from continuing operations	$ 37.5	$ 31.0	$ 196.5	$ (19.1)
Income from discontinued operations	0.6	0.3	1.0	1.8
Net income (loss)	$ 38.1	$ 31.3	$ 197.5	$ (17.3)
Denominator:
Basic - weighted average common shares outstanding	140,000,000	137,100,000	139,100,000	136,900,000
Dilutive effect of stock warrants	1,800,000	3,000,000	2,500,000	0
Dilutive effect of stock plans	2,200,000	2,500,000	2,500,000	0
Diluted shares outstanding	144,000,000	142,600,000	144,100,000	136,900,000
Basic earnings per share:
Income (loss) from continuing operations	$ 0.27	$ 0.23	$ 1.41	$ (0.14)
Income from discontinued operations	0.00	0.00	0.01	0.01
Net income (loss) per share	0.27	0.23	1.42	(0.13)
Diluted earnings per share:
Income (loss) from continuing operations	0.26	0.22	1.36	(0.14)
Income from discontinued operations	0.00	0.00	0.01	0.01
Net income (loss) per share	$ 0.26	$ 0.22	$ 1.37	$ (0.13)
Antidilutive securities excluded from computation of earnings per share	2,400,000	4,400,000	2,300,000	11,100,000
Warrants outstanding	1,462,119		1,462,119

Receivables (Details) - USD ($) $ in Millions	Sep. 30, 2013	Dec. 31, 2012
Receivables [Abstract]
Trade receivables	$ 102.1	$ 76.0
Interest receivables	0.7	0.8
Income Taxes Receivable	0.8	1.8
Other receivables	6.7	5.2
Allowance for doubtful accounts	(1.1)	(1.1)
Total	$ 109.2	$ 82.7

Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Finished products	$ 148.5	$ 142.7
Supplies	14.3	12.8
LIFO reserve	(1.0)	(1.0)
Total	225.0	209.8
Logs [Member]
Inventory Disclosure [Abstract]
Logs	42.9	37.6
Other Raw Materials [Member]
Inventory Disclosure [Abstract]
Logs	$ 20.3	$ 17.7

Assets Held for Sale (Details) - USD ($) $ in Millions	Sep. 30, 2013	Dec. 31, 2012
Property, plant and equipment held for sale [Abstract]
Assets held-for-sale, property, plant and equipment	$ 166.2	$ 167.9
Assets held for sale acumulated depreciation	(134.8)	(135.4)
Assets Held For Sale Property Plant and Equipment Net	31.4	32.5
Land Land Improvements And Logging Roads Net of Road Amortization [Member]
Property, plant and equipment held for sale [Abstract]
Assets held-for-sale, property, plant and equipment	9.9	10.0
Building [Member]
Property, plant and equipment held for sale [Abstract]
Assets held-for-sale, property, plant and equipment	15.6	17.1
Machinery and Equipment [Member]
Property, plant and equipment held for sale [Abstract]
Assets held-for-sale, property, plant and equipment	$ 140.7	$ 140.8

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate			35.00%	35.00%
Continuing operations	$ 4.4	$ 7.7	$ 51.6	$ (5.6)
Discontinued operations	0.4	0.2	0.6	1.0
Total tax benefit	$ 4.8	$ 7.9	$ 52.2	$ (4.6)
Continuing operations effective tax rate	11.00%	20.00%	21.00%	23.00%
Discontinued operation effective tax rate	35.00%	35.00%	35.00%	35.00%
Total effective tax rate	11.00%	20.00%	21.00%	21.00%
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	$ 13.5		$ 13.5
Payment of long-term deposit	$ (17.1)

Long-term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2013	Dec. 31, 2012
Notes and Loans Payable [Abstract]
Notes Payable	$ 0.0	$ 90.0
Other	0.7	0.5
Total	765.6	880.5
Less: current portion	(2.3)	(7.8)
Net long-term portion	763.3	782.7
Senior Notes due 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value	378.9	397.3
Notes and Loans Payable [Abstract]
Notes Payable	$ 350.0	350.0
Debt Instrument, Interest Rate, Stated Percentage	7.50%
Chilian Term Credit Facility Maturing 2019 [Member]
Notes and Loans Payable [Abstract]
Notes Payable	$ 16.2	39.3
Brazilian export financing facility, maturing 2017 [Member]
Notes and Loans Payable [Abstract]
Notes Payable	8.0	10.0
Senior Notes Payable 2013 Thru 2018 [Member]
Notes and Loans Payable [Abstract]
Notes Payable	22.0	112.0
Non Recourse Notes Payable 2018 [Member]
Notes and Loans Payable [Abstract]
Notes Payable	368.7	368.7
Recourse and non recourse [Member]
Notes and Loans Payable [Abstract]
Less: current portion	$ (2.3)	$ (97.8)

Long-term Debt Issuance (Details) $ in Millions	3 Months Ended			9 Months Ended
Long-term Debt Issuance (Details) $ in Millions	Sep. 30, 2013 USD ($)	Jun. 30, 2013 USD ($)	Sep. 30, 2012 USD ($)	Sep. 30, 2013 USD ($) payments	Sep. 30, 2012 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2003 USD ($)	Dec. 31, 1998 USD ($)
Debt Instrument [Line Items]
Notes Payable	$ 0.0			$ 0.0		$ 90.0
Current portion of long-term debt	2.3			2.3		7.8
Repayment of long-term debt	109.5	$ 2.6	$ 0.2	113.1	$ 242.3
Early debt extinguishment	(0.8)		0.0	$ (0.8)	$ (52.2)
Write off of Deferred Debt Issuance Cost	0.5		$ 4.5
Chilean Bank Loan [Member]
Debt Instrument [Line Items]
Number of Future Semi Annual Payments \| payments				16
Repayment of long-term debt	18.4			$ 21.0
Chilian Term Credit Facility Maturing 2019 [Member]
Debt Instrument [Line Items]
Notes Payable	16.2			16.2		39.3
Brazilian Term Credit Facility Maturing 2017 [Member]
Debt Instrument [Line Items]
Amount of loan issuance							$ 10.0
Notes Payable	8.0			$ 8.0		10.0
Number of Future Semi Annual Payments \| payments				10
Senior Notes Payable 2013 Thru 2018 [Member]
Debt Instrument [Line Items]
Amount of loan issuance								$ 348.6
Notes Payable	22.0			$ 22.0		112.0
Maturity in 2018	22.0			22.0
Senior Notes Payable due 2018 [Member]
Debt Instrument [Line Items]
Notes receivable used as collateral on loan	22.3			22.3
Non Recourse Notes Payable 2018 [Member]
Debt Instrument [Line Items]
Amount of loan issuance							$ 368.7
Notes Payable	368.7			368.7		368.7
Notes receivable used as collateral on loan	$ 410.0			$ 410.0
Amount of indebtedness liable for in event of default of notes receivable collateral	10.00%			10.00%
Senior Notes due 2020 [Member]
Debt Instrument [Line Items]
Notes Payable	$ 350.0			$ 350.0		$ 350.0

Other Operating Credits and Charges, Net (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Gain Contingencies [Line Items]
Insurance Recoveries	$ 0.4			$ 0.0	$ 0.4	$ 0.0
Adjustment to contingent consideration fair value	17.3			0.0	(17.3)	0.0
Increase (Decrease) in Workers' Compensation Liabilities	(1.0)			0.0	(1.0)	0.0
Other Cost and Expense, Operating	0.0				(0.2)	0.7
Inventory Write-down	0.0	$ (4.1)	$ (1.6)	0.0	(1.6)	0.0
Depreciation and amortization	0.0	$ (1.5)			(1.5)
Other Expenses	16.1			(1.2)	6.4	(1.2)
Other Operating Income (Expense), Net	16.1			(1.2)	9.1	(1.2)
Product Warranty Accrual, Period Increase (Decrease)	(2.0)			(1.0)	(6.1)	(1.0)
Value Added Tax Receivable	1.4			0.0	1.4	0.0
OSB Mills Construction Related Legal Reserves [Member]
Gain Contingencies [Line Items]
Other Cost and Expense, Operating				0.2
Construction related legal reserves	0.0			0.0	0.0	0.5
AbitibiBowater-LP [Member]
Gain Contingencies [Line Items]
Other Operating Credits and Charges Associated with Unconsolidated Affiliates	0.0			0.0	(1.8)	0.0
Canfor-LP [Member]
Gain Contingencies [Line Items]
Other Operating Credits and Charges Associated with Unconsolidated Affiliates	0.0			0.0	(0.9)	0.0
Unconsolidated Affiliates [Member]
Gain Contingencies [Line Items]
Other Operating Credits and Charges Associated with Unconsolidated Affiliates	$ 0.0			$ 0.0	$ (2.7)	$ 0.0

Transactions with Affiliates (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Related Party Transaction [Line Items]
Ownership in affiliates	50.00%			50.00%
Due from affiliates	$ 2.6			$ 2.6		$ 1.4
Due to affiliates	1.3			1.3		$ 6.7
AbitibiBowater-LP [Member]
Related Party Transaction [Line Items]
Revenue from affiliates	3.3	$ 2.6		10.7	$ 6.3
AbitibiBowater-LP [Member] \| I Joist [Member]
Related Party Transaction [Line Items]
Expenses from affiliates	$ 13.9	$ 11.3		38.4	29.7
Canfor-LP [Member] \| OSB [Member]
Related Party Transaction [Line Items]
Expenses from affiliates			$ 42.6	$ 98.2	$ 101.9

Selected Segment Data (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Selected Segment Data (Details) - USD ($) $ in Millions	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Net sales:	$ 507.4	$ 462.1	$ 1,605.5	$ 1,237.3
Operating profit (loss):	47.6	42.9	224.7	57.1
Other operating credits and charges, net	16.1	(1.2)	9.1	(1.2)
(Gain) loss on sale or impairment of long-lived assets	(0.3)	(4.3)	0.4	(4.5)
Gain on acquisition	0.0	0.0	35.9	0.0
Early debt extinguishment	(0.8)	0.0	(0.8)	(52.2)
General corporate and other expenses, net	(22.1)	(18.1)	(65.9)	(56.3)
Foreign currency gains (losses)	1.0	0.4	(3.3)	(2.3)
Investment income	1.7	4.1	8.3	11.7
Interest expense, net of capitalized interest	(7.6)	(10.7)	(28.0)	(36.4)
Income (loss) from continuing operations before taxes	41.9	38.7	248.1	(24.7)
Provision (benefit) for income taxes	4.4	7.7	51.6	(5.6)
Income (loss) from continuing operations	37.5	31.0	196.5	(19.1)
OSB [Member]
Segment Reporting Information [Line Items]
Net sales:	245.4	226.6	838.3	571.0
Operating profit (loss):	30.2	49.3	223.7	66.0
Siding [Member]
Segment Reporting Information [Line Items]
Net sales:	149.0	134.1	435.5	384.2
Operating profit (loss):	22.5	20.3	70.3	56.4
Engineered Wood Products [Member]
Segment Reporting Information [Line Items]
Net sales:	71.8	61.5	196.1	161.8
Operating profit (loss):	(2.0)	(3.0)	(10.6)	(9.3)
South America [Member]
Segment Reporting Information [Line Items]
Net sales:	41.5	42.0	130.9	127.1
Operating profit (loss):	5.3	4.5	17.8	11.2
Other [Member]
Segment Reporting Information [Line Items]
Net sales:	3.9	3.4	10.3	10.1
Operating profit (loss):	(2.1)	(2.6)	(6.1)	(7.8)
Intersegment elimination [Member]
Segment Reporting Information [Line Items]
Net sales:	(4.2)	(5.5)	(5.6)	(16.9)
Unconsolidated Affiliates [Member]
Segment Reporting Information [Line Items]
Other Operating Credits and Charges Associated with Unconsolidated Affiliates	$ 0.0	$ 0.0	$ (2.7)	$ 0.0

Contingency Reserves (Details) - USD ($) $ in Millions	Sep. 30, 2013	Dec. 31, 2012
Loss Contingencies [Line Items]
Loss contingency accrual	$ 14.4	$ 14.8
Current portion of contingency reserves	(2.0)	(2.0)
Long-term portion of contingency reserves	12.4	12.8
Environmental reserves [Member]
Loss Contingencies [Line Items]
Loss contingency accrual	13.9	14.1
Hardboard Siding Reserves [Member]
Loss Contingencies [Line Items]
Loss contingency accrual	$ 0.5	$ 0.7

Contingency Reserves Hardboard Contingencies Rollforward (Details) $ in Millions	Sep. 30, 2013 USD ($)
Loss Contingency Accrual [Roll Forward]
Beginning Balance, December 31	$ 14.8
Ending Balance	14.4
Hardboard Siding Reserves [Member]
Loss Contingency Accrual [Roll Forward]
Beginning Balance, December 31	0.7
Ending Balance	$ 0.5

Defined Benefit Pension Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 0.8	$ 0.9	$ 2.5	$ 2.7
Interest cost	3.2	3.7	9.7	11.0
Expected return on plan assets	(4.1)	(4.3)	(12.4)	(12.7)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0.1	0.1	0.2	0.2
Defined Benefit Plan, Amortization of Gains (Losses)	1.8	1.7	5.5	5.0
Net periodic pension cost	1.8	$ 2.1	5.5	$ 6.2
Pension Contributions			3.2
Anticipated Pension Contributions	$ 1.9		$ 1.9

Guarantees and Indemnifications (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Beginning Balance	$ 21.0	$ 26.5	$ 21.4	$ 30.3
Accrued to expense	0.4	0.4	0.7	0.9
Product Warranty Accrual, Period Increase (Decrease)	2.0	1.0	6.1	1.0
Payments made	(3.8)	(4.5)	(8.6)	(8.8)
Total warranty reserves	$ 21.0	$ 26.5	$ 21.4	$ 30.3	$ 19.6	$ 23.4
Current portion of warranty reserves					(12.0)	(12.0)
Long-term portion of warranty reserves					$ 7.6	$ 11.4

Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income [Line Items]
Foreign Currency Translation Adjustment, Net of Tax	$ (14.4)		$ (14.4)		$ (14.7)	$ (7.6)
Pension and Other Postretirement Benefit Plans, Net of Tax	(95.0)		(95.0)		(96.0)	(99.0)
Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(0.4)		(0.4)		(0.3)	(0.3)
Available-for-sale Securities Adjustment, Net of Tax	2.0		2.0		2.2	1.0
Other, Net of Tax	(2.0)		(2.0)		(2.0)	(2.0)
Accumulated comprehensive loss	(109.8)		(109.8)		$ (110.8)	$ (107.9)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0.1	$ 0.1	0.2	$ 0.2
Defined Benefit Plan, Amortization of Gains (Losses)	1.8	1.7	5.5	5.0
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Transition Asset (Obligation), Recognized in Net Periodic Benefit Cost, before Tax	(0.1)		(0.2)
Defined Benefit Plan, Net Periodic Benefit Cost	1.8	2.1	5.5	6.2
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Transition Asset (Obligation), Recognized in Net Periodic Benefit Cost, Tax	0.5		1.5
Foreign currency translation adjustments	0.3	2.9	(6.8)	1.7
Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	2.3		8.0
Unrealized loss on derivative instrument	(0.1)	(0.5)	(0.1)	(0.7)
Unrealized gain (loss) on marketable securities, net of reversals	(0.2)	0.5	1.0	0.7
Other Comprehensive Income, Other, Net of Tax	0.0		0.0
Other comprehensive income	2.3		2.1
Pension and Other Postretirement Benefit Plans, Net Prior Service Costs Arising During Period, Net of Tax	(1.3)		(4.0)
Other comprehensive income (loss), net of tax	1.0	3.6	(1.9)	4.4
Defined benefit pension plans	1.0	$ 0.7	4.0	$ 2.7
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax	$ 1.3		$ 4.0

Business Combinations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Business Combinations (Details) - USD ($) $ in Millions	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Dec. 31, 2012
Business Combination [Abstract]
Gain on acquisition	$ 0.0	$ 0.0	$ 35.9	$ 0.0
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value	95.9
Business Acquisition, Cost of Acquired Entity, Purchase Price	74.6		74.6
Business Combination, Contingent Consideration, Liability	7.2		7.2		$ 24.3
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net	194.8		194.8
Business Acquisition, Purchase Price Allocation, Current Assets	22.7		22.7
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment	146.4		$ 146.4
Business Combination Disclosure [Text Block]			On May 31, 2013, LP acquired full control of the Peace Valley OSB joint venture in which LP previously maintained a 50% interest. Peace Valley OSB's results of operations have been fully consolidated in all periods subsequent to May 31, 2013. Since LP previously served as the exclusive distributor of all OSB produced by this venture, this acquisition will not have a material impact on LP's consolidated net sales. Due to the pre-existing 50% ownership interest in Peace Valley OSB, this acquisition was accounted for as a step acquisition in accordance with ASC 805, Business Combinations (“ASC 805”). Accordingly, LP recognized a gain of $35.9 million in connection with this transaction to record its 50% ownership interest in Peace Valley at fair value on the acquisition date. The fair value of LP's existing 50% interest ($95.9 million) was determined using a combination of the income and market approach. In completing this valuation, management considered future earnings and cash flow potential of the business, earnings multiples, and recent market transactions of similar businesses. This gain is included in "Non-operating income (expense)." The purchase price of the 50% acquired interest was $74.6 million (including working capital) paid in cash. Additionally, as part of the purchase consideration, LP agreed to pay contingent consideration equal to a pre-defined percentage of the operation's earnings before interest, taxes, depreciation and amortization (EBITDA) over a pre-defined threshold for each of the next three years. As of May 31, 2013, the fair value of the contingent consideration payable was valued at $24.3 million and was recorded in “accounts payable and accrued liabilities” and “other long term liabilities”. The fair value of the contingent consideration payable will be remeasured at the end of each reporting period. During the third quarter of 2013, the fair value of the contingent consideration payable was remeasured and reduced by $17.3 million due to the decline in projected OSB prices and therefore resulting reduction in the estimated EBITDA of the operation. Including the 50% interest previously owned by LP, LP acquired net assets of $194.8 million, consisting of $22.7 million in current assets, $146.4 million in fixed asset, $43.8 million of intangible assets (comprised of $34.1 million of timber licenses and $9.7 million of goodwill) and $8.7 million in current liabilities and $9.4 million in long term liabilities. Certain information about Peace Valley OSB (e.g., pro forma financial information and allocation of purchase price) is not presented because such information is not material to LP's results of operations and financial position. While LP uses its best estimates and assumptions as part of the purchase price allocation process to value assets acquired and liabilities assumed at the business combination date, its estimates and assumptions are subject to refinement. As a result, during the preliminary purchase price allocation period, which may be up to one year from the business combination date, LP may record adjustments to the assets acquired and liabilities assumed with a corresponding offset to goodwill. LP will record adjustments to assets acquired or liabilities assumed subsequent to the measurement period in its operating results in the period in which the adjustments were determined.
Gain on acquisition	0.0	$ 0.0	$ (35.9)	$ 0.0
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets	43.8		43.8
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets	34.1		34.1
Goodwill	9.7		9.7			$ 0.0
Business Acquisition, Purchase Price Allocation, Current Liabilities	8.7		8.7
Business Acquisition, Purchase Price Allocation, Other Noncurrent Liabilities	$ 9.4		$ 9.4

Proposed Acquisition of Ainsworth Lumber Co Ltd (Details)	3 Months Ended
	Sep. 30, 2013 CAD ($) shares
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares \| shares	0.114
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned \| $	$ 1.94
Aggregate Maximum [Member]
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares \| shares	27.5
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned \| $	$ 467.0

Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2013	Sep. 30, 2013	Dec. 31, 2012
Goodwill [Line Items]
Goodwill		$ 9.7	$ 0.0
Goodwill, Acquired During Period	$ 9.7

Goodwill and Other Intangible Assets Other Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2013	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 2.9
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets	34.1
Finite-Lived Intangible Assets, Amortization Expense, Year Two	2.9
Finite-Lived Intangible Assets, Amortization Expense, Year Three	3.6
Finite-Lived Intangible Assets, Amortization Expense, Year Four	3.6
Finite-Lived Intangible Assets, Amortization Expense, Year Five	3.6
Finite-Lived Intangible Assets, Net	69.1	$ 37.2
Timber Licenses [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	69.0	36.6
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	0.0	0.5
Other Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Net	$ 0.1	$ 0.1

Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Discontinued Operations (Details) - USD ($) $ in Millions	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Sales [Abstract]
Disposal Group, Including Discontinued Operation, Revenue	$ 4.1	$ 5.8	$ 16.1	$ 20.2
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	1.7
Income from discontinued operations before taxes	$ 1.0	$ 0.5	$ 1.6	$ 2.8