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Earnings per Share (Details) (USD $) In Millions, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Loss Attributed to LP Common Shares [Abstract]
Income (loss) from continuing operations	$ (33.0)	$ 23.5	$ (56.0)	$ 1.2
Loss from discontinued operations	(2.5)	(1.2)	(2.5)	(1.4)
Net income (loss)	$ (35.5)	$ 22.3	$ (58.5)	$ (0.2)
Denominator:
Basic - weighted average common shares outstanding	131.4	128.5	131.3	127.2
Dilutive effect of stock warrants	0	9.5	0	9.3
Dilutive effect of stock plans	0	1.8	0	1.7
Diluted shares outstanding	131.4	139.8	131.3	138.2
Basic earnings per share:
Income (loss) from continuing operations	$ (0.25)	$ 0.18	$ (0.43)	$ 0.01
Loss from discontinued operations	$ (0.02)	$ (0.01)	$ (0.02)	$ (0.01)
Net income (loss) per share	$ (0.27)	$ 0.17	$ (0.45)	$ 0.00
Diluted earnings per share:
Income (loss) from continuing operations	$ (0.25)	$ 0.17	$ (0.43)	$ 0.01
Loss from discontinued operations	$ (0.02)	$ (0.01)	$ (0.02)	$ (0.01)
Net income (loss) per share	$ (0.27)	$ 0.16	$ (0.45)	$ 0.00
Antidilutive securities excluded from computation of earnings per share	9.0	5.6	9.2	5.4

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