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Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Entity Information [Line Items]
Notes Receivable		$ 432.2us-gaap_NotesReceivableNet
Capitalized interest	(1.3)us-gaap_InterestCostsIncurredCapitalized	(1.6)us-gaap_InterestCostsIncurredCapitalized	0.2us-gaap_InterestCostsIncurredCapitalized
Amortization of financing costs and discounts	1.2us-gaap_AmortizationOfFinancingCostsAndDiscounts	1.4us-gaap_AmortizationOfFinancingCostsAndDiscounts	1.5us-gaap_AmortizationOfFinancingCostsAndDiscounts
Maximum
Entity Information [Line Items]
Equity Method Investment, Ownership Percentage	50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember
Minimum
Entity Information [Line Items]
Equity Method Investment, Ownership Percentage	20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember
All Customers [Member] [Member]
Entity Information [Line Items]
Concentration Risk, Percentage	41.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = lpx_AllCustomersMemberMember	44.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = lpx_AllCustomersMemberMember	46.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = lpx_AllCustomersMemberMember
Home Depot [Member]
Entity Information [Line Items]
Concentration Risk, Percentage		10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ProductOrServiceAxis = lpx_HomeDepotMember
Non recourse notes payable 2018
Entity Information [Line Items]
Notes payable	368.7us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = lpx_NonRecourseNotesPayable2018Member	368.7us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = lpx_NonRecourseNotesPayable2018Member
Deferred loss on early debt extinguishment
Entity Information [Line Items]
Write off of Deferred Debt Issuance Cost		1.4us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_DebtInstrumentAxis = us-gaap_DeferredLossOnEarlyExtinguishmentOfDebtMember	4.5us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_DebtInstrumentAxis = us-gaap_DeferredLossOnEarlyExtinguishmentOfDebtMember	4.5us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_DebtInstrumentAxis = us-gaap_DeferredLossOnEarlyExtinguishmentOfDebtMember
Senior Notes 2018 [Member]
Entity Information [Line Items]
Notes Receivable	$ 410.0us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = lpx_SeniorNotes2018Member	$ 410.0us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = lpx_SeniorNotes2018Member

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Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of interest capitalized, including amount of allowance for funds used during construction.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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