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v2.4.1.9

Investments in and Advances to Affiliates (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Related Party Transaction [Line Items] |  |  |
Gain on sale of joint venture | $ 0 us-gaap_GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee | $ (1.2)us-gaap_GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee | $ 0 us-gaap_GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee
Due from affiliates | 0.7 us-gaap_DueFromRelatedPartiesCurrent | 0.8 us-gaap_DueFromRelatedPartiesCurrent |
Due to affiliates | 0.4 us-gaap_DueToRelatedPartiesCurrent |  |
AbitibiBowater LP |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from affiliates | 9.8 us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = lpx_AbitibibowaterLpMember | 13.7 us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = lpx_AbitibibowaterLpMember | 8.7 us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = lpx_AbitibibowaterLpMember
AbitibiBowater LP | I-Joist |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses from affiliates | 55.4 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_ProductOrServiceAxis = lpx_IJoistMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = lpx_AbitibibowaterLpMember | 52.0 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_ProductOrServiceAxis = lpx_IJoistMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = lpx_AbitibibowaterLpMember | 37.9 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_ProductOrServiceAxis = lpx_IJoistMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = lpx_AbitibibowaterLpMember
Canfor-LP | OSB |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses from affiliates |  | $ 98.2 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_ProductOrServiceAxis = lpx_OsbMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = lpx_CanforLpMember | $ 148.0 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_ProductOrServiceAxis = lpx_OsbMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = lpx_CanforLpMember

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