Earnings per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income (loss) attributed to LP common shares [Abstract]
Income (loss) from continuing operations	$ 31.4	$ (59.3)	$ (17.0)	$ (115.3)
Loss from discontinued operations	(0.1)	(6.3)	(0.3)	(8.8)
Net income (loss)	$ 31.3	$ (65.6)	$ (17.3)	$ (124.1)
Denominator:
Basic - weighted average common shares outstanding	137.1	134.5	136.9	132.4
Dilutive effect of stock warrants	3.0	0	0	0
Dilutive effect of stock plans	2.5	0	0	0
Diluted shares outstanding	142.6	134.5	136.9	132.4
Basic earnings per share:
Income (loss) from continuing operations	$ 0.23	$ (0.44)	$ (0.13)	$ (0.87)
Loss from discontinued operations	$ 0.00	$ (0.05)	$ 0.00	$ (0.07)
Net income (loss) per share	$ 0.23	$ (0.49)	$ (0.13)	$ (0.94)
Diluted earnings per share:
Income (loss) from continuing operations	$ 0.22	$ (0.44)	$ (0.13)	$ (0.87)
Loss from discontinued operations	$ 0.00	$ (0.05)	$ 0.00	$ (0.07)
Net income (loss) per share	$ 0.22	$ (0.49)	$ (0.13)	$ (0.94)
Antidilutive securities excluded from computation of earnings per share	4.4	5.9	11.1	7.3