Gain for Reductions in Reserves Associated With Canadian Timber Obligations

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The amount added to the accrual for newly incurred environmental loss contingencies. These additions include remediation expense and interest accretion. These additions do not relate to changes in the environmental accrual related to a business acquisition or divestiture, to currency movements, or revisions in previously existing estimates.

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The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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-Glossary Plan Curtailment

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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.

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Amount of increase (decrease) in loss contingency liability.

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The amount of costs recognized during the period for non-pension postretirement benefits, such as medical, dental and life insurance.

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The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

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Total increases or decreases in the standard and extended product warranty liability during the period.

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Segment Information Additional Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Product Warranty Accrual, Period Increase (Decrease)			$ 11.3	$ 17.7	$ (1.8)
Gain on settlement of litigation related to ARS			0	0	20.0
Adjustments related to prior year inventory	4.8us-gaap_InventoryWriteDown	1.6us-gaap_InventoryWriteDown	0us-gaap_InventoryWriteDown	4.8us-gaap_InventoryWriteDown	0us-gaap_InventoryWriteDown
Adjustments to retirement accounts			0	0	3.8
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments			0	0	2.2
Termination indemnities in South America				1.6
Reductions, net of additions, to product related contingency reserves			0	0	(5.0)
Reserves For Timber Obligations			0lpx_ReservesForTimberObligations	0lpx_ReservesForTimberObligations	0.8lpx_ReservesForTimberObligations
Addition to environmental related contingency reserves			(0.5)	(1.0)	0
Fair Value, Inputs, Level 2
Segment Reporting Information [Line Items]
Impairment of Long-Lived Assets to be Disposed of				4.4
Supplemental employee retirement plans, defined benefit
Segment Reporting Information [Line Items]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments				(2.2)
Siding
Segment Reporting Information [Line Items]
Product Warranty Accrual, Period Increase (Decrease)				$ 1.0