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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 |  | $ 432.2 us-gaap_NotesReceivableNet |  |
Capitalized interest | (1.3)us-gaap_InterestCostsIncurredCapitalized | (1.6)us-gaap_InterestCostsIncurredCapitalized | 0.2 us-gaap_InterestCostsIncurredCapitalized |
Amortization of financing costs and discounts | 1.2 us-gaap_AmortizationOfFinancingCostsAndDiscounts | 1.4 us-gaap_AmortizationOfFinancingCostsAndDiscounts | 1.5 us-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 | 368.7 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = lpx_NonRecourseNotesPayable2018Member | 368.7 us-gaap_NotesPayable / us-gaap_LongtermDebtTypeAxis = lpx_NonRecourseNotesPayable2018Member |  |
Deferred loss on early debt extinguishment |  |  |  |
Entity Information [Line Items] |  |  |  |
Write off of Deferred Debt Issuance Cost |  | 1.4 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_DebtInstrumentAxis = us-gaap_DeferredLossOnEarlyExtinguishmentOfDebtMember | 4.5 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_DebtInstrumentAxis = us-gaap_DeferredLossOnEarlyExtinguishmentOfDebtMember | 4.5 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_DebtInstrumentAxis = us-gaap_DeferredLossOnEarlyExtinguishmentOfDebtMember
Senior Notes 2018 [Member] |  |  |  |
Entity Information [Line Items] |  |  |  |
Notes Receivable | $ 410.0 us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = lpx_SeniorNotes2018Member | $ 410.0 us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = lpx_SeniorNotes2018Member |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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