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Summary of Significant Accounting Policies Earnings per share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Loss Attributed to LP Common Shares [Abstract]                      
Income (loss) from continuing operations                 $ 177.4 $ 29.5 $ (175.7)
Loss from discontinued operations                 (0.3) (0.7) (5.6)
Net income (loss) attributed to Louisiana-Pacific Corporation                 $ 177.1 $ 28.8 $ (181.3)
Denominator:                      
Basic - weighted average common shares outstanding                 139.6 137.1 133.2
Dilutive effect of employee stock plans                 2.5 2.3 0
Dilutive effect of stock warrants                 2.2 3.2 0
Diluted shares outstanding                 144.3 142.6 133.2
Basic earnings per share:                      
Income (loss) from continuing operations $ (0.14) $ 0.27 $ 0.67 $ 0.47 $ 0.35 $ 0.23 $ (0.28) $ (0.08) $ 1.27 $ 0.22 $ (1.32)
Loss from discontinued operations                 $ 0.00 $ (0.01) $ (0.04)
Net income (loss) per share - basic $ (0.15) $ 0.27 $ 0.68 $ 0.47 $ 0.33 $ 0.23 $ (0.27) $ (0.08) $ 1.27 $ 0.21 $ (1.36)
Diluted earnings per share:                      
Income (loss) from continuing operations $ (0.14) $ 0.26 $ 0.65 $ 0.45 $ 0.34 $ 0.22 $ (0.28) $ (0.08) $ 1.23 $ 0.20 $ (1.32)
Loss from discontinued operations                 $ 0.00 $ 0.00 $ (0.04)
Net income (loss) per share - diluted $ (0.15) $ 0.26 $ 0.65 $ 0.45 $ 0.32 $ 0.22 $ (0.27) $ (0.08) $ 1.23 $ 0.20 $ (1.36)
Antidilutive securities excluded from computation of earnings per share                 2.3 5.3 7.1