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Summary of Significant Accounting Policies Earnings per share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Loss Attributed to LP Common Shares [Abstract]      
Loss from continuing operations $ (172.1) $ (32.6) $ (115.6)
Loss from discontinued operations (9.2) (6.4) (5.3)
Net loss attributed to Louisiana-Pacific Corporation $ (181.3) $ (39.0) $ (120.9)
Denominator:      
Basic - weighted average common shares outstanding 133.2 129.1 108.5
Dilutive effect of employee stock plans 0 0 0
Dilutive effect of stock warrants 0 0 0
Diluted shares outstanding 133.2 129.1 108.5
Basic earnings per share:      
Loss from continuing operations $ (1.29) $ (0.25) $ (1.06)
Loss from discontinued operations $ (0.07) $ (0.05) $ (0.05)
Net loss per share $ (1.36) $ (0.30) $ (1.11)
Diluted earnings per share:      
Loss from continuing operations $ (1.29) $ (0.25) $ (1.06)
Loss from discontinued operations $ (0.07) $ (0.05) $ (0.05)
Net income (loss) per share diluted $ (1.36) $ (0.30) $ (1.11)
Antidilutive securities excluded from computation of earnings per share 7.1 9.1 7.4