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Selected Segment Data (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Net sales: $ 471.7us-gaap_SalesRevenueNet $ 444.7us-gaap_SalesRevenueNet
Operating profit (loss): (33.2)us-gaap_OperatingIncomeLoss (10.2)us-gaap_OperatingIncomeLoss
Other operating charges and credits, net (11.6)us-gaap_OtherOperatingIncomeExpenseNet 0us-gaap_OtherOperatingIncomeExpenseNet
(Gain) loss on sale or impairment of long-lived assets, net (0.1)lpx_GainLossOnSaleOrImpairmentOfLongLivedAssetsNet 0lpx_GainLossOnSaleOrImpairmentOfLongLivedAssetsNet
Other Selling, General and Administrative Expense (22.7)us-gaap_OtherSellingGeneralAndAdministrativeExpense (27.3)us-gaap_OtherSellingGeneralAndAdministrativeExpense
Other non-operating income (2.2)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax (4.3)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Interest income 1.4us-gaap_InvestmentIncomeNet 1.8us-gaap_InvestmentIncomeNet
Interest expense, net of capitalized interest (7.5)us-gaap_InterestExpense (7.7)us-gaap_InterestExpense
Loss from operations before taxes (40.8)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (19.8)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Benefit for income taxes (6.3)us-gaap_IncomeTaxExpenseBenefit (5.6)us-gaap_IncomeTaxExpenseBenefit
Net loss (34.5)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest (14.2)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
OSB [Member]    
Segment Reporting Information [Line Items]    
Net sales: 190.2us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= lpx_OsbMember
194.9us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= lpx_OsbMember
Operating profit (loss): (28.4)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= lpx_OsbMember
(1.9)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= lpx_OsbMember
Siding [Member]    
Segment Reporting Information [Line Items]    
Net sales: 173.5us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= lpx_SidingMember
143.5us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= lpx_SidingMember
Operating profit (loss): 32.9us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= lpx_SidingMember
19.2us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= lpx_SidingMember
Engineered Wood Products [Member]    
Segment Reporting Information [Line Items]    
Net sales: 64.8us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= lpx_EngineeredWoodProductsMember
62.2us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= lpx_EngineeredWoodProductsMember
Operating profit (loss): (4.1)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= lpx_EngineeredWoodProductsMember
(3.1)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= lpx_EngineeredWoodProductsMember
South America [Member]    
Segment Reporting Information [Line Items]    
Net sales: 35.9us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_SouthAmericaMember
36.6us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_SouthAmericaMember
Operating profit (loss): 2.4us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_SouthAmericaMember
4.2us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_SouthAmericaMember
Other [Member]    
Segment Reporting Information [Line Items]    
Net sales: 7.3us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
7.9us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Operating profit (loss): (0.9)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
(0.7)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember
Intersegment elimination [Member]    
Segment Reporting Information [Line Items]    
Net sales: $ 0us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_IntersegmentEliminationMember
$ (0.4)us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_IntersegmentEliminationMember