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Net Income Per Share (Schedule of Income Per Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Net Income Per Share |  |  |  |
Net (loss) from continuing operations | $ (23.7) | $ (29.3) |  |
Net income from discontinued operations | 21.7 | 0.5 |  |
Net (loss) | (2.0) | (28.8) | (1,200.0) | (491.1)
Net (loss) from continuing operations - if converted | (23.7) | (29.3) |  |
Net income from discontinued operations - if converted | 21.7 | 0.5 |  |
Net (loss) - if converted | $ (2.0) | $ (28.8) |  |
Weighted average common shares | 125.1 | 123.1 |  |
Less: Weighted average unvested restricted stock | 2.0 | 0.8 |  |
Denominator for basic calculation | 123.1 | 122.3 |  |
Convertible notes | 44.3 | 44.3 |  |
Convertible preferred stock - equivalent common shares | 195.6 | 75.6 |  |
Convertible preferred stock - less: share issuance limitation | 172.8 | 52.8 |  |
Convertible preferred stock - net allowable shares | 22.8 | 22.8 |  |
Subtotal | 67.1 | 67.1 |  |
Less: shares excluded in a period of net loss or antidilution | 67.1 | 67.1 |  |
Denominator for diluted calculation | 123.1 | 122.3 |  |
Net (loss) per share from continuing operations - basic and diluted | $ (0.19) | $ (0.24) |  |
Net income per share from discontinued operations - basic and diluted | $ 0.18 |  |  |
Net (loss) per share - basic and diluted | $ (0.02) | $ (0.24) |  |

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