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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, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loss Attributed to LP Common Shares [Abstract]
Income (loss) from continuing operations									$ (73.4)	$ 177.4	$ 29.5
Loss from discontinued operations									(2.0)	(0.3)	(0.7)
Net income (loss) attributed to Louisiana-Pacific Corporation									$ (75.4)us-gaap_NetIncomeLoss	$ 177.1us-gaap_NetIncomeLoss	$ 28.8us-gaap_NetIncomeLoss
Denominator:
Basic - weighted average common shares outstanding									141.1	139.6	137.1
Dilutive effect of employee stock plans									0	2.5	2.3
Dilutive effect of stock warrants									0	2.2	3.2
Diluted shares outstanding									141.1	144.3	142.6
Basic earnings per share:
Income (loss) from continuing operations	$ (0.30)	$ (0.14)	$ 0.00	$ (0.10)	$ (0.14)	$ 0.27	$ 0.67	$ 0.47	$ (0.52)	$ 1.27	$ 0.22
Loss from discontinued operations									$ (0.01)	$ 0.00	$ (0.01)
Net income (loss) per share - basic	$ (0.30)us-gaap_EarningsPerShareBasic	$ (0.15)us-gaap_EarningsPerShareBasic	$ 0.00us-gaap_EarningsPerShareBasic	$ (0.10)us-gaap_EarningsPerShareBasic	$ (0.15)us-gaap_EarningsPerShareBasic	$ 0.27us-gaap_EarningsPerShareBasic	$ 0.68us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ (0.53)us-gaap_EarningsPerShareBasic	$ 1.27us-gaap_EarningsPerShareBasic	$ 0.21us-gaap_EarningsPerShareBasic
Diluted earnings per share:
Income (loss) from continuing operations	$ (0.30)	$ (0.14)	$ 0.00	$ (0.10)	$ (0.14)	$ 0.26	$ 0.65	$ 0.45	$ (0.52)	$ 1.23	$ 0.20
Loss from discontinued operations									$ (0.01)	$ 0.00	$ 0.00
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Antidilutive securities excluded from computation of earnings per share									2.5	2.3	5.8