Earnings per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Loss Attributed to LP Common Shares [Abstract]
Income (loss) from continuing operations	$ (37.2)	$ (33.0)	$ (48.4)	$ (56.0)
Loss from discontinued operations	(0.1)	(2.5)	(0.2)	(2.5)
Net income (loss)	$ (37.3)	$ (35.5)	$ (48.6)	$ (58.5)
Denominator:
Basic - weighted average common shares outstanding	137.0	131.4	136.8	131.3
Dilutive effect of stock warrants	0	0	0	0
Dilutive effect of stock plans	0	0	0	0
Diluted shares outstanding	137.0	131.4	136.8	131.3
Basic earnings per share:
Income (loss) from continuing operations	$ (0.27)	$ (0.25)	$ (0.35)	$ (0.43)
Loss from discontinued operations	$ 0.00	$ (0.02)	$ 0.00	$ (0.02)
Net income (loss) per share	$ (0.27)	$ (0.27)	$ (0.35)	$ (0.45)
Diluted earnings per share:
Income (loss) from continuing operations	$ (0.27)	$ (0.25)	$ (0.35)	$ (0.43)
Loss from discontinued operations	$ 0.00	$ (0.02)	$ 0.00	$ (0.02)
Net income (loss) per share	$ (0.27)	$ (0.27)	$ (0.35)	$ (0.45)
Antidilutive securities excluded from computation of earnings per share	5.1	9.0	5.2	9.2