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Investments Contractual maturies (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Available-for-sale Securities, Amortized Cost Basis $ 0.3us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 0.4us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale Securities, Fair Value Disclosure 4.6us-gaap_AvailableForSaleSecurities  
Within one year from the balance sheet date [Member]    
Available-for-sale Securities, Amortized Cost Basis 0us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= lpx_WithinoneyearfromthebalancesheetdateMember		  
Available-for-sale Securities, Fair Value Disclosure 0us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= lpx_WithinoneyearfromthebalancesheetdateMember		  
more than one year from balance sheet date [Member]    
Available-for-sale Securities, Amortized Cost Basis 0.3us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= lpx_MoreThanOneYearFromBalanceSheetDateMember		  
Available-for-sale Securities, Fair Value Disclosure $ 4.6us-gaap_AvailableForSaleSecurities
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= lpx_MoreThanOneYearFromBalanceSheetDateMember