Earnings per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income (loss) attributed to LP common shares [Abstract]
Income (loss) from continuing operations	$ 2.1	$ 94.1	$ (12.1)	$ 159.1
Income from discontinued operations	0	0.2	0	0.3
Net income (loss)	$ 2.1	$ 94.3	$ (12.1)	$ 159.4
Denominator:
Basic - weighted average common shares outstanding	140,800,000	139,100,000	140,800,000	138,800,000
Dilutive effect of stock warrants	1,300,000	2,700,000	0	2,900,000
Dilutive effect of stock plans	1,900,000	2,300,000	0	2,600,000
Diluted shares outstanding	144,000,000	144,100,000	140,800,000	144,300,000
Basic earnings per share:
Income (loss) from continuing operations	$ 0.01	$ 0.67	$ (0.09)	$ 1.14
Income from discontinued operations	$ 0.00	$ 0.01	$ 0.00	$ 0.01
Net income (loss) per share	$ 0.01	$ 0.68	$ (0.09)	$ 1.15
Diluted earnings per share:
Income (loss) from continuing operations	$ 0.01	$ 0.65	$ (0.09)	$ 1.10
Income from discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Net income (loss) per share	$ 0.01	$ 0.65	$ (0.09)	$ 1.10
Antidilutive securities excluded from computation of earnings per share	4,100,000	2,400,000	3,500,000	2,300,000
Warrants outstanding	1,462,119		1,462,119