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Retirement Plans and Post Retirement Benefits Pension Costs, Assumptions Used in Net Periodic Costs and Expected Contributions and Payments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]          
Net actuarial loss     $ (7.1)us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss    
Defined Benefit Plan, Benefit Obligation     364.1us-gaap_DefinedBenefitPlanBenefitObligation 322.1us-gaap_DefinedBenefitPlanBenefitObligation 352.0us-gaap_DefinedBenefitPlanBenefitObligation
Defined Benefit Plan, Accumulated Benefit Obligation     361.5us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation 317.7us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation  
Noncurrent pension assets, included in “Other assets”     0.6us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent 0.6us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent  
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation     348.0us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation 304.7us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation  
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets     217.9us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets 256.7us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets  
Defined benefit plan, fair value of plan assets     268.0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 270.3us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 259.3us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Defined Benefit Plan, Benefits Paid     17.1us-gaap_DefinedBenefitPlanBenefitsPaid 18.6us-gaap_DefinedBenefitPlanBenefitsPaid  
Maximum benefit amortization period     20 years    
Approximate percentage of assets represented by most significant plans     80.00%lpx_DefinedBenefitPlanSignificantPlansApproximatePercentageOfPlanAssetsAccountedFor    
Approximate percentage of benefit obligations represented by most significant plans     82.00%lpx_DefinedBenefitPlanSignificantPlansApproximatePercentageOfBeneiftObligationAccountedFor    
Rate of eligible compensation increase     4.00%lpx_DefinedBenefitPlanSignificantPlansAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease    
Trust assets, corporate owned life insurance policies     9.7us-gaap_LifeInsuranceCorporateOrBankOwnedAmount 9.7us-gaap_LifeInsuranceCorporateOrBankOwnedAmount  
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]          
Service cost     3.5us-gaap_DefinedBenefitPlanServiceCost 3.4us-gaap_DefinedBenefitPlanServiceCost 3.7us-gaap_DefinedBenefitPlanServiceCost
Interest cost     14.1us-gaap_DefinedBenefitPlanInterestCost 12.7us-gaap_DefinedBenefitPlanInterestCost 14.6us-gaap_DefinedBenefitPlanInterestCost
Expected return on plan assets     (16.9)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (16.5)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (16.8)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Amortization of prior service cost     0us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit 0.3us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit 0.3us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
Amortization of net actuarial loss     5.5us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses 7.3us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses 6.6us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
Net periodic pension cost     6.2us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost 7.2us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost 8.4us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments     0us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments 0us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments 2.2us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments
Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Discount rate     4.59%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate 3.80%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate 4.41%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
Rate of compensation increase     0.80%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease 0.70%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease 0.70%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease
Expected return on plan assets     6.72%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets 6.64%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets 6.87%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Other changes in plan assets and benefit obligations recognized in other comprehensive incom [Abstract]          
Net actuarial (gain) loss     44.2us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax (35.9)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax 11.3us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
Amortization of net actuarial loss     (5.5)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax (7.3)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax (6.6)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
Amortization of prior service cost     9.4us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax (0.3)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax (0.3)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax
Settlement     0us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationBeforeTax 0us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationBeforeTax (2.2)us-gaap_OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationBeforeTax
Foreign exchange rate changes     0lpx_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansForeignExchangeRateChangesBeforeTax 0.2lpx_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansForeignExchangeRateChangesBeforeTax 0lpx_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansForeignExchangeRateChangesBeforeTax
Total recognized in OCI     48.1us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax (43.3)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax 2.2us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
Benefits Expected to be Paid from Benefit Plans [Abstract]          
2014     22.7us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths    
2015     24.3us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo    
2016     30.1us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree    
2017     20.0us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour    
2018     20.6us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive    
2019 - 2023     108.1us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter    
Defined Benefit Plan, Actuarial Gain (Loss)     37.4us-gaap_DefinedBenefitPlanActuarialGainLoss (24.1)us-gaap_DefinedBenefitPlanActuarialGainLoss  
Defined Benefit Plan, Transfers 0lpx_DefinedBenefitPlanTransfers 0.3lpx_DefinedBenefitPlanTransfers 0lpx_DefinedBenefitPlanTransfers 0.3lpx_DefinedBenefitPlanTransfers  
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets     (5.0)us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesPlanAssets (3.2)us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesPlanAssets  
Defined Benefit Plan, Curtailments     9.4us-gaap_DefinedBenefitPlanCurtailments 0us-gaap_DefinedBenefitPlanCurtailments  
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)     (5.3)us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation (3.6)us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation  
Defined Benefit Plan, Actual Return on Plan Assets     10.2us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets 28.3us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets  
Defined Benefit Plan, Contributions by Employer     9.6us-gaap_DefinedBenefitPlanContributionsByEmployer 4.2us-gaap_DefinedBenefitPlanContributionsByEmployer  
Defined Benefit Plan, Funded Status of Plan     (96.1)us-gaap_DefinedBenefitPlanFundedStatusOfPlan (51.8)us-gaap_DefinedBenefitPlanFundedStatusOfPlan  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate     3.82%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate 4.58%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase     0.57%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease 0.63%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease  
Current pension liabilities, included in “Accounts payable and accrued liabilities”     2.7us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities 0.2us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities  
Noncurrent pension liabilities, included in “Other long-term liabilities”     93.8us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent 52.2us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent  
Total     (95.9)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet (51.8)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet  
Net actuarial loss     (149.6)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax (112.1)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax  
Prior service cost     9.5us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax 0.1us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax  
Total     159.1us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax 112.2us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax  
Prior service cost     0.5us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit    
Total     7.6us-gaap_DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear    
Supplemental employee retirement plans, defined benefit          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Benefits Paid         10.4us-gaap_DefinedBenefitPlanBenefitsPaid
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Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]          
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments       (2.2)us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments
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Quoted Prices in Active Markets for Identical Assets (Level 1)          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, fair value of plan assets     160.6us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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148.7us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Fair Value, Inputs, Level 2          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, fair value of plan assets     81.3us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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79.9us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Significant Unobservable Inputs (Level 3)          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, fair value of plan assets     26.1us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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= us-gaap_FairValueInputsLevel3Member
41.7us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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64.7us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Diversified real asset funds          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, fair value of plan assets     13.9us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[1] 11.1us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[1]  
Diversified real asset funds | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, fair value of plan assets     13.9us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[1]  
Diversified real asset funds | Fair Value, Inputs, Level 2          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, fair value of plan assets     0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[1]  
Diversified real asset funds | Significant Unobservable Inputs (Level 3)          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, fair value of plan assets     0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[1]  
Domestic stock funds          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, fair value of plan assets     84.5us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[2] 83.0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[2]  
Domestic stock funds | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, fair value of plan assets     71.4us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[2] 68.8us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[2]  
Domestic stock funds | Fair Value, Inputs, Level 2          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, fair value of plan assets     13.1us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[2]  
Domestic stock funds | Significant Unobservable Inputs (Level 3)          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, fair value of plan assets     0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[2]  
International stock funds          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, fair value of plan assets     37.9us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[2] 42.4us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[2]  
International stock funds | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, fair value of plan assets     12.8us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[2] 14.4us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[2]  
International stock funds | Fair Value, Inputs, Level 2          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, fair value of plan assets     25.1us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[2] 28.0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[2]  
International stock funds | Significant Unobservable Inputs (Level 3)          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, fair value of plan assets     0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[2]  
International bond funds          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, fair value of plan assets     40.9us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[1] 34.2us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[1]  
International bond funds | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, fair value of plan assets     0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[2]  
International bond funds | Fair Value, Inputs, Level 2          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, fair value of plan assets     40.9us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[2]  
International bond funds | Significant Unobservable Inputs (Level 3)          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, fair value of plan assets     0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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[2]  
Real Estate          
Defined Benefit Plan Disclosure [Line Items]          
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[3]  
Real Estate | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Defined Benefit Plan Disclosure [Line Items]          
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[3]  
Real Estate | Fair Value, Inputs, Level 2          
Defined Benefit Plan Disclosure [Line Items]          
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[3]  
Real Estate | Significant Unobservable Inputs (Level 3)          
Defined Benefit Plan Disclosure [Line Items]          
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Multi-strategy Funds          
Defined Benefit Plan Disclosure [Line Items]          
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[4]  
Multi-strategy Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Defined Benefit Plan Disclosure [Line Items]          
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[4]  
Multi-strategy Funds | Fair Value, Inputs, Level 2          
Defined Benefit Plan Disclosure [Line Items]          
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[4]  
Multi-strategy Funds | Significant Unobservable Inputs (Level 3)          
Defined Benefit Plan Disclosure [Line Items]          
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Cash and Cash Equivalents          
Defined Benefit Plan Disclosure [Line Items]          
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Defined Benefit Plan Disclosure [Line Items]          
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Cash and Cash Equivalents | Fair Value, Inputs, Level 2          
Defined Benefit Plan Disclosure [Line Items]          
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Cash and Cash Equivalents | Significant Unobservable Inputs (Level 3)          
Defined Benefit Plan Disclosure [Line Items]          
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[1] Fixed income investments include investments in funds that are primarily invested in a diversified portfolio of investment grade U.S. and international debt securities.
[2] Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.
[3] Real estate investments are primarily invested in U.S. commercial real estate.
[4] The multi-strategy funds invest in various hedge funds that employ a fund of funds strategy.