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Gain (loss) on sales or impairment of long lived assets (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, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Impaired Long-Lived Assets Held and Used [Line Items]                      
Asset Impairment Charges                 $ 0us-gaap_AssetImpairmentCharges $ (0.1)us-gaap_AssetImpairmentCharges $ (4.4)us-gaap_AssetImpairmentCharges
Gain (Loss) on Sale of Property Plant Equipment 0.6us-gaap_GainLossOnSaleOfPropertyPlantEquipment 3.7us-gaap_GainLossOnSaleOfPropertyPlantEquipment             3.1us-gaap_GainLossOnSaleOfPropertyPlantEquipment (0.1)us-gaap_GainLossOnSaleOfPropertyPlantEquipment (0.5)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Gain Loss On Sale Or Impairment Of Long Lived Assets, Net (1.0)lpx_GainLossOnSaleOrImpairmentOfLongLivedAssetsNet 3.6lpx_GainLossOnSaleOrImpairmentOfLongLivedAssetsNet 0.5lpx_GainLossOnSaleOrImpairmentOfLongLivedAssetsNet 0lpx_GainLossOnSaleOrImpairmentOfLongLivedAssetsNet (0.6)lpx_GainLossOnSaleOrImpairmentOfLongLivedAssetsNet (0.3)lpx_GainLossOnSaleOrImpairmentOfLongLivedAssetsNet 0.7lpx_GainLossOnSaleOrImpairmentOfLongLivedAssetsNet 0lpx_GainLossOnSaleOrImpairmentOfLongLivedAssetsNet 3.1lpx_GainLossOnSaleOrImpairmentOfLongLivedAssetsNet (0.2)lpx_GainLossOnSaleOrImpairmentOfLongLivedAssetsNet (4.9)lpx_GainLossOnSaleOrImpairmentOfLongLivedAssetsNet
Fair Value, Inputs, Level 2                      
Impaired Long-Lived Assets Held and Used [Line Items]                      
Impairment of Long-Lived Assets to be Disposed of                   $ 4.4us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueInputsLevel2Member