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Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Basic and diluted earnings per share [Abstract]
Income (loss) from continuing operations	$ 10		$ (22)
Weighted average common shares outstanding	93.9		91.8
Add: Weighted average restricted stock awards outstanding	0.4	[1]	0.7	[1]
Basic weighted average common shares outstanding	94.3		92.5
Add: Dilutive impact of stock options	1.4
Diluted weighted average common shares outstanding	95.7		92.5
Basic earnings (loss) per share from continuing operation	$ 0.11		$ (0.23)
Diluted earnings (loss) per share from continuing operation	$ 0.11		$ (0.23)
[1] Restricted stock awards containing rights to non-forfeitable dividends which participate in undistributed earnings with common shareholders are considered participating securities for purposes of computing earnings per share.

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