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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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