Earnings per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income (loss) attributed to LP common shares [Abstract]
Income (loss) from continuing operations	$ 94.2	$ (37.2)	$ 159.6	$ (48.4)
Loss from discontinued operations	(0.1)	(0.1)	(0.2)	(0.2)
Net income (loss)	$ 94.1	$ (37.3)	$ 159.4	$ (48.6)
Denominator:
Basic - weighted average common shares outstanding	139,100,000	137,000,000	138,800,000	136,800,000
Dilutive effect of stock warrants	2,700,000	0	2,900,000	0
Dilutive effect of stock plans	2,300,000	0	2,600,000	0
Diluted shares outstanding	144,100,000	137,000,000	144,300,000	136,800,000
Basic earnings per share:
Income (loss) from continuing operations	$ 0.68	$ (0.27)	$ 1.15	$ (0.35)
Loss from discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Net income (loss) per share	$ 0.68	$ (0.27)	$ 1.15	$ (0.35)
Diluted earnings per share:
Income (loss) from continuing operations	$ 0.65	$ (0.27)	$ 1.10	$ (0.35)
Loss from discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Net income (loss) per share	$ 0.65	$ (0.27)	$ 1.10	$ (0.35)
Antidilutive securities excluded from computation of earnings per share	2,400,000	5,100,000	2,300,000	5,200,000
Warrants outstanding	2,924,770		2,924,770