Earnings per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income (loss) attributed to LP common shares [Abstract]
Income (loss) from continuing operations	$ 65.4	$ (11.2)
Loss from discontinued operations	(0.1)	(0.1)
Net income (loss)	$ 65.3	$ (11.3)
Denominator:
Basic - weighted average common shares outstanding	138,400,000	136,600,000
Dilutive effect of stock warrants	3,000,000	0
Dilutive effect of stock plans	3,000,000	0
Diluted shares outstanding	144,400,000	136,600,000
Basic earnings per share:
Income (loss) from continuing operations	$ 0.47	$ (0.08)
Loss from discontinued operations	$ 0.00	$ 0.00
Net income (loss) per share	$ 0.47	$ (0.08)
Diluted earnings per share:
Income (loss) from continuing operations	$ 0.45	$ (0.08)
Loss from discontinued operations	$ 0.00	$ 0.00
Net income (loss) per share	$ 0.45	$ (0.08)
Antidilutive securities excluded from computation of earnings per share	2,200,000	7,400,000
Warrants outstanding	3,211,707