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Retirement Plans and Post Retirement Benefits Defined Contribution Plans and Other Benefit Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2009
Defined Contribution Plans [Abstract] |  |  |  |
Expenses related to defined contribution plans and multiemployer plan | $ 5.6 us-gaap_MultiemployerPlanPeriodContributions | $ 8.3 us-gaap_MultiemployerPlanPeriodContributions | $ 5.2 us-gaap_MultiemployerPlanPeriodContributions |
Funded status | (96.1)us-gaap_DefinedBenefitPlanFundedStatusOfPlan | (51.8)us-gaap_DefinedBenefitPlanFundedStatusOfPlan |  |
Deferred Compensation Arrangements [Abstract] |  |  |  |
Deferred compensation plan maximum deferral percentage | 90.00%lpx_DeferredCompensationArrangementMaximumDeferralPercentage |  |  |
Deferred compensation plan, employer contributions and related earnings, maximum vesting period | 5 years |  |  |
Deferred compensation liability included in "Other long-term liabilities" | (2.1)us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent | (1.9)us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent |  |
U.S. 401(k) Plans |  |  |  |
Defined Contribution Plans [Abstract] |  |  |  |
Maximum percentage of employee's wages eligible for company match |  |  |  | 3.50%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = lpx_UnitedStatesDefinedContributionPlansMember
Shares of LP common stock included in plan assets | 2.5 us-gaap_DefinedBenefitPlanNumberOfSharesOfEquitySecuritiesIssuedByEmployerAndRelatedPartiesIncludedInPlanAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = lpx_UnitedStatesDefinedContributionPlansMember |  |  |
Total market value of plan assets represented by LP common stock | 12.40%lpx_DefinedBenefitPlanPercentageOfEmployerAndRelatedPartySecuritiesIncludedInPlanAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = lpx_UnitedStatesDefinedContributionPlansMember |  |  |
Canada Defined Contribution Plans |  |  |  |
Defined Contribution Plans [Abstract] |  |  |  |
Maximum percentage of employee's wages eligible for company match | 3.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = lpx_CanadaDefinedContributionPlansMember |  |  |
Percentage of base contribution | 2.50%lpx_DefinedContributionPlanBaseAnnualContributionPerEmployeePercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = lpx_CanadaDefinedContributionPlansMember |  |  |
Employer matching percentage | 50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = lpx_CanadaDefinedContributionPlansMember |  |  |
Other Postretirement Benefits |  |  |  |
Defined Contribution Plans [Abstract] |  |  |  |
Funded status | $ 8.0 us-gaap_DefinedBenefitPlanFundedStatusOfPlan / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember | $ 8.2 us-gaap_DefinedBenefitPlanFundedStatusOfPlan / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  |

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- Definition Deferred Compensation Arrangement, Employer Contributions and Earnings, Maximum Vesting Period + References No definition available. + Details
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- Definition Deferred Compensation Arrangement, Maximum Deferral Percentage + References No definition available. + Details
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- Definition Defined Benefit Plan, Percentage of Employer and Related Party Securities Included in Plan Assets + References No definition available. + Details
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- Definition Defined Contribution Plan, Base Annual Contribution Per Employee, Percent + References No definition available. + Details
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- Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
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- Definition The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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- Definition The number of employer shares or related party shares included in plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (n) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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