Earnings per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income (loss) attributed to LP common shares [Abstract]
Income (loss) from continuing operations	$ 37.5	$ 31.0	$ 196.5	$ (19.1)
Income from discontinued operations	0.6	0.3	1.0	1.8
Net income (loss)	$ 38.1	$ 31.3	$ 197.5	$ (17.3)
Denominator:
Basic - weighted average common shares outstanding	140,000,000	137,100,000	139,100,000	136,900,000
Dilutive effect of stock warrants	1,800,000	3,000,000	2,500,000	0
Dilutive effect of stock plans	2,200,000	2,500,000	2,500,000	0
Diluted shares outstanding	144,000,000	142,600,000	144,100,000	136,900,000
Basic earnings per share:
Income (loss) from continuing operations	$ 0.27	$ 0.23	$ 1.41	$ (0.14)
Income from discontinued operations	$ 0.00	$ 0.00	$ 0.01	$ 0.01
Net income (loss) per share	$ 0.27	$ 0.23	$ 1.42	$ (0.13)
Diluted earnings per share:
Income (loss) from continuing operations	$ 0.26	$ 0.22	$ 1.36	$ (0.14)
Income from discontinued operations	$ 0.00	$ 0.00	$ 0.01	$ 0.01
Net income (loss) per share	$ 0.26	$ 0.22	$ 1.37	$ (0.13)
Antidilutive securities excluded from computation of earnings per share	2,400,000	4,400,000	2,300,000	11,100,000
Warrants outstanding	1,462,119		1,462,119