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Accumulated Comprehensive Loss (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
ACCUMULATED COMPREHENSIVE LOSS [Abstract]        
Amortization of prior service cost $ 0us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit $ 0.3us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit $ 0.3us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit  
Amounts reclassified from accumulated comprehensive income 6.1us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax (4.6)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax (5.4)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax  
Foreign currency translation adjustment (14.5)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (11.6)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 0.6us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax (14.5)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax (11.6)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax 0.6us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax  
Net gain (loss) (25.5)lpx_Othercomprehensiveincomelosspensionandpostretirementbenefitsbeforereclassifications 33.3lpx_Othercomprehensiveincomelosspensionandpostretirementbenefitsbeforereclassifications 2.4lpx_Othercomprehensiveincomelosspensionandpostretirementbenefitsbeforereclassifications  
Foreign currency translation adjustments, beginning of period (19.2)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax (7.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax (8.2)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax  
Pension adjustments, beginning of period (70.3)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (99.0)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (96.0)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax  
Unrealized gain (loss) on derivative instruments, beginning of period 0us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax (0.3)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax 0.4us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax  
Unreazlied gain (loss) on investments, beginning of period 2.0us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 1.0us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 0.2us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax  
Other, beginning of period (1.7)lpx_AccumulatedOtherComprehensiveIncomeLossOtherNetOfTax (2.0)lpx_AccumulatedOtherComprehensiveIncomeLossOtherNetOfTax (2.6)lpx_AccumulatedOtherComprehensiveIncomeLossOtherNetOfTax  
Accumulated comprehensive loss, net of tax, beginning of period (131.3)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (89.2)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (107.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (106.2)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Pension adjustments, activity 28.7lpx_Othercomprehensiveincomelosspensionandotherpostretirementbeneiftsnetcurrentperiodothercomprehensiveincome (28.7)lpx_Othercomprehensiveincomelosspensionandotherpostretirementbeneiftsnetcurrentperiodothercomprehensiveincome 3.0lpx_Othercomprehensiveincomelosspensionandotherpostretirementbeneiftsnetcurrentperiodothercomprehensiveincome  
Unrealized gain (loss) on derivative financial instruments, activity 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (0.3)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 0.7us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax  
Unrealized gain (loss) on investments, activity (0.6)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (1.0)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax (0.8)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax  
Other, activity 0.5us-gaap_OtherComprehensiveIncomeOtherNetOfTax 0.3us-gaap_OtherComprehensiveIncomeOtherNetOfTax 0.6us-gaap_OtherComprehensiveIncomeOtherNetOfTax  
Foreign currency translation adjustments, end of period (33.7)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax (19.2)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax (7.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax  
Pension adjustments, end of period (99.0)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (70.3)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (99.0)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax  
Unrealized gain (loss) on derivative instruments, end of period 0us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax 0us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax (0.3)us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax  
Unreazlied gain (loss) on investments, end of period 2.6us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 2.0us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 1.0us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax  
Other, end of period (1.2)lpx_AccumulatedOtherComprehensiveIncomeLossOtherNetOfTax (1.7)lpx_AccumulatedOtherComprehensiveIncomeLossOtherNetOfTax (2.0)lpx_AccumulatedOtherComprehensiveIncomeLossOtherNetOfTax  
Accumulated comprehensive loss, net of tax, end of period (131.3)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (89.2)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (107.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (106.2)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Pension adjustments income tax benefit 17.7us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax 15.5us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax 0.9us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax  
Reclassification from accumulated other comprehensive income, current period, before tax (38.9)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax 23.3us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax 3.7us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax  
Other comprehensive income loss net of tax including redeemable non controlling interest (42.1)lpx_OtherComprehensiveIncomeLossNetOfTaxIncludingRedeemableNonControllingInterest 18.7lpx_OtherComprehensiveIncomeLossNetOfTaxIncludingRedeemableNonControllingInterest (1.7)lpx_OtherComprehensiveIncomeLossNetOfTaxIncludingRedeemableNonControllingInterest  
Amortization of net actuarial loss 5.5us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses 7.3us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses 6.6us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses  
Other comprehensive income (loss), transition obligation, before tax 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationBeforeTax (0.4)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationBeforeTax 1.5us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationBeforeTax  
Other comprehensive income (loss), net periodic benefit cost, before tax 6.2us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost 7.2us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost 8.4us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost  
Other comprehensive (income) loss, reclassification adjustment from AOCI, pension and other postretirement benefit plans, for net transition (asset) obligation, tax (2.3)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationTax (2.6)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationTax (3.0)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationTax  
Other comprehensive (income) loss, reclassification adjustment from AOCI, pension and other postretirement benefit plans, for net (gain) loss, net of tax 3.2us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax (4.6)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax (5.4)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax  
Comprehensive income (loss), net of tax, including portion attributable to noncontrolling interest     (1.7)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest  
Other Comprehensive Income (Loss), Tax $ 0.3us-gaap_OtherComprehensiveIncomeLossTax $ 0.6us-gaap_OtherComprehensiveIncomeLossTax $ 0.5us-gaap_OtherComprehensiveIncomeLossTax