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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