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v2.4.1.9

Retirement Plans and Post Retirement Benefits Asset Allocation and Fair Value of Plan Assets (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Target Allocations [Abstract] |  |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocation | 100.00%lpx_DefinedBenefitPlanActualPlanAssetAllocation |  | 100.00%lpx_DefinedBenefitPlanActualPlanAssetAllocation |  |
Target allocation | 1 |  |  |  |
Defined benefit plan, fair value of plan assets | $ 268.0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets |  | $ 270.3 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets |  | $ 259.3 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 160.6 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  | 148.7 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  |
Fair Value, Inputs, Level 2 |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 81.3 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  | 79.9 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Significant Unobservable Inputs (Level 3) |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Mangement fees | 0.1 lpx_DefinedBenefitPlanMangementFees / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | (0.5)lpx_DefinedBenefitPlanMangementFees / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Defined benefit plan, fair value of plan assets | 26.1 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 41.7 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 64.7 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Equity Securities |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Equity securities | 47.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocation | 45.70%lpx_DefinedBenefitPlanActualPlanAssetAllocation / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember |  | 46.40%lpx_DefinedBenefitPlanActualPlanAssetAllocation / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember |  |
Debt Securities |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Equity securities | 27.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocation | 43.80%lpx_DefinedBenefitPlanActualPlanAssetAllocation / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember |  | 36.80%lpx_DefinedBenefitPlanActualPlanAssetAllocation / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember |  |
Real Estate |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Equity securities | 8.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocation | 0.00%lpx_DefinedBenefitPlanActualPlanAssetAllocation / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember |  | 6.20%lpx_DefinedBenefitPlanActualPlanAssetAllocation / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember |  |
Domestic stock funds |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 84.5 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_EquityFundsDomesticStockFundsMember | [1] | 83.0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_EquityFundsDomesticStockFundsMember | [1] |
Domestic stock funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 71.4 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_EquityFundsDomesticStockFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | [1] | 68.8 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_EquityFundsDomesticStockFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | [1] |
Domestic stock funds | Fair Value, Inputs, Level 2 |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 13.1 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_EquityFundsDomesticStockFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | [1] | 14.2 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_EquityFundsDomesticStockFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | [1] |
Domestic stock funds | Significant Unobservable Inputs (Level 3) |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_EquityFundsDomesticStockFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | [1] | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_EquityFundsDomesticStockFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | [1] |
International stock funds |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 37.9 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_EquityFundsInternationalStockFundsMember | [1] | 42.4 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_EquityFundsInternationalStockFundsMember | [1] |
International stock funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 12.8 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_EquityFundsInternationalStockFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | [1] | 14.4 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_EquityFundsInternationalStockFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | [1] |
International stock funds | Fair Value, Inputs, Level 2 |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 25.1 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_EquityFundsInternationalStockFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | [1] | 28.0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_EquityFundsInternationalStockFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | [1] |
International stock funds | Significant Unobservable Inputs (Level 3) |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_EquityFundsInternationalStockFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | [1] | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_EquityFundsInternationalStockFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | [1] |
Domestic bond funds |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 62.5 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsDomesticEquitiesMember | [2] | 54.4 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsDomesticEquitiesMember | [1] |
Domestic bond funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 62.5 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsDomesticEquitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | [1] | 54.4 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsDomesticEquitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | [1] |
Domestic bond funds | Fair Value, Inputs, Level 2 |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsDomesticEquitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | [1] | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsDomesticEquitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | [1] |
Domestic bond funds | Significant Unobservable Inputs (Level 3) |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsDomesticEquitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | [1] | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsDomesticEquitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | [1] |
International bond funds |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 40.9 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsInternationalBondFundMemberMember | [2] | 34.2 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsInternationalBondFundMemberMember | [2] |
International bond funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsInternationalBondFundMemberMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | [1] | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsInternationalBondFundMemberMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | [1] |
International bond funds | Fair Value, Inputs, Level 2 |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 40.9 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsInternationalBondFundMemberMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | [1] | 34.2 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsInternationalBondFundMemberMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | [1] |
International bond funds | Significant Unobservable Inputs (Level 3) |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsInternationalBondFundMemberMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | [1] | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsInternationalBondFundMemberMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | [1] |
Diversified real asset funds |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 13.9 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsDiversifiedRealAssetsMember | [2] | 11.1 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsDiversifiedRealAssetsMember | [2] |
Diversified real asset funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 13.9 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsDiversifiedRealAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | [2] | 11.1 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsDiversifiedRealAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | [2] |
Diversified real asset funds | Fair Value, Inputs, Level 2 |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsDiversifiedRealAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | [2] | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsDiversifiedRealAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | [2] |
Diversified real asset funds | Significant Unobservable Inputs (Level 3) |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsDiversifiedRealAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | [2] | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = lpx_FixedIncomeFundsDiversifiedRealAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | [2] |
Real Estate |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateFundsMember | [3] | 16.5 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateFundsMember | [3] |
Real Estate | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | [3] | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | [3] |
Real Estate | Fair Value, Inputs, Level 2 |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | [3] | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | [3] |
Real Estate | Significant Unobservable Inputs (Level 3) |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Mangement fees |  |  | (0.1)lpx_DefinedBenefitPlanMangementFees / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Defined benefit plan, fair value of plan assets | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | [3] | 16.5 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | [3] | 15.2 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Multi-strategy Funds |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 26.1 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMultistrategyMember | [4] | 25.2 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMultistrategyMember | [4] |
Multi-strategy Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMultistrategyMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | [4] | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMultistrategyMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | [4] |
Multi-strategy Funds | Fair Value, Inputs, Level 2 |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Defined benefit plan, fair value of plan assets | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMultistrategyMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | [4] | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMultistrategyMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | [4] |
Multi-strategy Funds | Significant Unobservable Inputs (Level 3) |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Mangement fees | 0.1 lpx_DefinedBenefitPlanMangementFees / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMultistrategyMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | (0.4)lpx_DefinedBenefitPlanMangementFees / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMultistrategyMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |
Defined benefit plan, fair value of plan assets | 26.1 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMultistrategyMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | [4] | 25.2 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMultistrategyMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | [4] | 49.5 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMultistrategyMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Cash and Cash Equivalents |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
Equity securities | 18.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocation | 10.50%lpx_DefinedBenefitPlanActualPlanAssetAllocation / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember |  | 10.60%lpx_DefinedBenefitPlanActualPlanAssetAllocation / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember |  |
Defined benefit plan, fair value of plan assets | 2.2 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember |  | 3.5 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember |  |
Cash and Cash Equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
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Cash and Cash Equivalents | Fair Value, Inputs, Level 2 |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
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Cash and Cash Equivalents | Significant Unobservable Inputs (Level 3) |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |
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[1] | Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.
[2] | Fixed income investments include investments in funds that are primarily invested in a diversified portfolio of investment grade U.S. and international debt securities.
[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.

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