Earnings per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014
Income (loss) attributed to LP common shares [Abstract]
Income (loss) from continuing operations	$ (18.3)	$ 37.5	$ (30.4)	$ 196.5
Income (loss) from discontinued operations	(2.1)	0.6	(2.1)	1.0
Net income (loss)	$ (20.4)	$ 38.1	$ (32.5)	$ 197.5
Denominator:
Basic - weighted average common shares outstanding	140,800,000	140,000,000	140,900,000	139,100,000
Dilutive effect of stock warrants	0	1,800,000	0	2,500,000
Dilutive effect of stock plans	0	2,200,000	0	2,500,000
Diluted shares outstanding	140,800,000	144,000,000	140,900,000	144,100,000
Basic earnings per share:
Income (loss) from continuing operations	$ (0.13)	$ 0.27	$ (0.22)	$ 1.41
Income (loss) from discontinued operations	$ (0.01)	$ 0.00	$ (0.01)	$ 0.01
Net income (loss) per share	$ (0.14)	$ 0.27	$ (0.23)	$ 1.42
Diluted earnings per share:
Income (loss) from continuing operations	$ (0.13)	$ 0.26	$ (0.22)	$ 1.36
Income from discontinued operations	$ (0.01)	$ 0.00	$ (0.01)	$ 0.01
Net income (loss) per share	$ (0.14)	$ 0.26	$ (0.23)	$ 1.37
Antidilutive securities excluded from computation of earnings per share	3,800,000	2,400,000	2,500,000	2,300,000
Warrants outstanding	1,462,119		1,462,119		573,521