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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
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Net Income Per Share |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ (1,084.3) | $ 4.5 | $ (92.0) | $ (28.8) | $ (446.4) | $ (6.9) | $ (21.2) | $ (16.6) | $ (1,200.6) | $ (491.1) | $ 7.5
Net income (loss) if-converted |  |  |  |  |  |  |  |  | $ (1,200.6) | $ (491.1) |
Weighted average common shares |  |  |  |  |  |  |  |  | 124.1 | 122.5 |
Less: Weighted average unvested restricted stock |  |  |  |  |  |  |  |  | 2.1 | 1.7 |
Denominator for basic calculation |  |  |  |  |  |  |  |  | 122.0 | 120.8 | 112.8
Stock compensation awards |  |  |  |  |  |  |  |  |  | 0.1 |
Convertible notes |  |  |  |  |  |  |  |  | 44.3 | 44.5 |
Convertible preferred stock - equivalent common shares |  |  |  |  |  |  |  |  | 102.7 |  |
Convertible preferred stock - less: share issuance limitation |  |  |  |  |  |  |  |  | 79.9 |  |
Convertible preferred stock - net allowable shares |  |  |  |  |  |  |  |  | 22.8 | 19.2 |
Subtotal |  |  |  |  |  |  |  |  | 67.1 | 63.8 |
Less: shares excluded in a period of net loss (e) |  |  |  |  |  |  |  |  | 67.1 | 63.8 |
Denominator for diluted calculation | 122.6 | 122.6 | 121.7 | 122.3 | 121.3 | 121.3 | 121.1 | 119.6 | 122.0 | 120.8 | 166.6
Net income (loss) per share - basic |  |  |  |  |  |  |  |  | $ (9.84) | $ (4.07) | $ 0.07
Net income (loss) per share - diluted | $ (8.84) | $ 0.04 | $ (0.76) | $ (0.24) | $ (3.68) | $ (0.06) | $ (0.18) | $ (0.14) | $ (9.84) | $ (4.07) | $ 0.05

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