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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

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