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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended									12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Tax positions taken in current year										$ 0.1us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	$ 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	$ 0.1us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Payment of long-term deposit								17.1us-gaap_IncreaseDecreaseInDeposits		0us-gaap_IncreaseDecreaseInDeposits	17.1us-gaap_IncreaseDecreaseInDeposits	0us-gaap_IncreaseDecreaseInDeposits
Excess Tax Benefit from Share-based Compensation										13.9us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	13.2us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Income Tax Refunds										1.6us-gaap_ProceedsFromIncomeTaxRefunds	0.9us-gaap_ProceedsFromIncomeTaxRefunds	1.9us-gaap_ProceedsFromIncomeTaxRefunds
Income Taxes Paid										3.7us-gaap_IncomeTaxesPaid	6.8us-gaap_IncomeTaxesPaid	1.6us-gaap_IncomeTaxesPaid
Deferred Tax Assets, Operating Loss Carryforwards	(134.0)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards				(97.1)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards					(134.0)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards	(97.1)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Valuation Allowance, Amount	32.3us-gaap_DeferredTaxAssetsValuationAllowance				23.5us-gaap_DeferredTaxAssetsValuationAllowance					32.3us-gaap_DeferredTaxAssetsValuationAllowance	23.5us-gaap_DeferredTaxAssetsValuationAllowance
Valuation Allowances and Reserves, Period Increase (Decrease)										22.1us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease
U.S. Federal tax rate										(35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Continuing operations tax benefit	(11.3)us-gaap_IncomeTaxExpenseBenefit	(3.6)us-gaap_IncomeTaxExpenseBenefit	(6.7)us-gaap_IncomeTaxExpenseBenefit	(5.6)us-gaap_IncomeTaxExpenseBenefit	(10.5)us-gaap_IncomeTaxExpenseBenefit	4.4us-gaap_IncomeTaxExpenseBenefit	24.3us-gaap_IncomeTaxExpenseBenefit		22.9us-gaap_IncomeTaxExpenseBenefit	(27.2)us-gaap_IncomeTaxExpenseBenefit	41.1us-gaap_IncomeTaxExpenseBenefit	7.0us-gaap_IncomeTaxExpenseBenefit
Effective tax rate (%)										(27.00%)us-gaap_EffectiveIncomeTaxRateContinuingOperations	19.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations	19.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Deferred Tax Liabilities, Undistributed Foreign Earnings	51.0us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings									51.0us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
State and local income taxes										(2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	2.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	2.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Effective Income Tax Rate Reconciliation, Other Adjustments										0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(3.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Adjustment to previously recorded deferred tax liabilities										0.00%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	(12.00%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
Uncertain tax positions										1.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies	0.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies	(1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies
Valuation allowance										10.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	(12.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	1.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Income Taxes Receivable	1.4us-gaap_IncomeTaxReceivable				1.2us-gaap_IncomeTaxReceivable					1.4us-gaap_IncomeTaxReceivable	1.2us-gaap_IncomeTaxReceivable
Year 2031
Deferred Tax Assets, Operating Loss Carryforwards	(36.1)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = lpx_Year2029Member									(36.1)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = lpx_Year2029Member
State and Local Jurisdiction | indefinite
Deferred Tax Assets, Operating Loss Carryforwards	(31.8)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxCreditCarryforwardAxis = lpx_IndefinateMember									(31.8)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxCreditCarryforwardAxis = lpx_IndefinateMember
State and Local Jurisdiction | Years through 2032
Deferred Tax Assets, Capital Loss Carryforwards	0.9us-gaap_DeferredTaxAssetsCapitalLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxCreditCarryforwardAxis = lpx_YearsThrough2026Member									0.9us-gaap_DeferredTaxAssetsCapitalLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxCreditCarryforwardAxis = lpx_YearsThrough2026Member
Foreign tax rate
Effect of foreign tax rates / foreign exhchange										5.00%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential / us-gaap_IncomeTaxAuthorityAxis = lpx_ForeigntaxrateMember	(3.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential / us-gaap_IncomeTaxAuthorityAxis = lpx_ForeigntaxrateMember	(1.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential / us-gaap_IncomeTaxAuthorityAxis = lpx_ForeigntaxrateMember
Foreign Currency Gain (Loss)
Effect of foreign tax rates / foreign exhchange										(6.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCurrencyGainLossMember	(3.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCurrencyGainLossMember	(2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCurrencyGainLossMember
Foreign Country | Years through 2032
Deferred Tax Assets, Operating Loss Carryforwards	(54.3)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = lpx_YearsThrough2026Member									(54.3)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = lpx_YearsThrough2026Member
Foreign Country | Carried Forward Indefinitely
Deferred Tax Assets, Operating Loss Carryforwards	(10.9)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = lpx_CarriedForwardIndefinetlyMember									(10.9)us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = lpx_CarriedForwardIndefinetlyMember
State NOL
Valuation Allowance, Amount	9.9us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = lpx_StateNolMember									9.9us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = lpx_StateNolMember
State Capital Losses
Valuation Allowance, Amount	0.9us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = lpx_StateCapitalLossesMember									0.9us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = lpx_StateCapitalLossesMember
Canadian NOL [Member]
Valuation Allowance, Amount	5.6us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = lpx_CanadianNolMember									5.6us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = lpx_CanadianNolMember
Canadian Capital Losses
Valuation Allowance, Amount	13.7us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = lpx_CanadianCapitalLossesMember									13.7us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = lpx_CanadianCapitalLossesMember
State Tax Credit
Valuation Allowance, Amount	0.8us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = lpx_StateTaxCreditMember									0.8us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = lpx_StateTaxCreditMember
Other Items
Valuation Allowance, Amount	$ 1.4us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = lpx_OtherItemsMember									$ 1.4us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = lpx_OtherItemsMember

X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards.

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Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable.

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The net cash inflow or outflow for the increase (decrease) in the beginning and end of period deposits balances.

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The amount of cash received during the period as refunds for the overpayment of taxes.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Total increases or decreases in allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

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