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Summary of Significant Accounting Policies Assets Held for Sale (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2014
Property, Plant and Equipment [Line Items] |  |  |  |
Capitalized Interest Costs, Including Allowance for Funds Used During Construction | $ 1.3 us-gaap_InterestCostsIncurredCapitalized | $ 1.6 us-gaap_InterestCostsIncurredCapitalized | $ (0.2)us-gaap_InterestCostsIncurredCapitalized |
Sales Price of held-for-sale assets |  |  |  | 11.9 lpx_SalesPriceofheldforsaleassets
Assets Held-for-sale, Property, Plant and Equipment | 59.4 us-gaap_AssetsHeldForSalePropertyPlantAndEquipment | 112.2 us-gaap_AssetsHeldForSalePropertyPlantAndEquipment |  |
Accumulated depreciation | 50.1 lpx_AssetsHeldForSaleAccumulatedDepreciation | 95.9 lpx_AssetsHeldForSaleAccumulatedDepreciation |  |
Net property, plant and equipment | 9.3 lpx_AssetsHeldForSalePropertyPlantAndEquipmentNet | 16.3 lpx_AssetsHeldForSalePropertyPlantAndEquipmentNet |  |
Land, land improvements and logging roads, net of road amortization [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Assets Held-for-sale, Property, Plant and Equipment | 4.5 us-gaap_AssetsHeldForSalePropertyPlantAndEquipment / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = lpx_LandLandImprovementsAndLoggingRoadsNetOfRoadAmortizationMember | 6.9 us-gaap_AssetsHeldForSalePropertyPlantAndEquipment / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = lpx_LandLandImprovementsAndLoggingRoadsNetOfRoadAmortizationMember |  |
Building [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Assets Held-for-sale, Property, Plant and Equipment | 2.9 us-gaap_AssetsHeldForSalePropertyPlantAndEquipment / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = us-gaap_BuildingMember | 6.2 us-gaap_AssetsHeldForSalePropertyPlantAndEquipment / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = us-gaap_BuildingMember |  |
Machinery and equipment [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Assets Held-for-sale, Property, Plant and Equipment | $ 52.0 us-gaap_AssetsHeldForSalePropertyPlantAndEquipment / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = us-gaap_MachineryAndEquipmentMember | $ 99.1 us-gaap_AssetsHeldForSalePropertyPlantAndEquipment / us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis = us-gaap_MachineryAndEquipmentMember |  |

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- Definition Assets Held For Sale Accumulated Depreciation + References No definition available. + Details
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- Definition Assets Held For Sale Property Plant and Equipment Net + References No definition available. + Details
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- Definition Sales Price of held-for-sale assets + References No definition available. + Details
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- Definition Property, plant and equipment that is held for sale apart from normal operations and anticipated to be sold in less than one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 + Details
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- Definition Amount of interest capitalized, including amount of allowance for funds used during construction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433 + Details
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- Details
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- Details
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