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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, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Net Income Per Share                      
Net income (loss) $ (496.0) $ (6.9) $ (21.2) $ (16.6) $ 9.0 $ 1.0 $ 7.2 $ (9.7) $ (540.7) $ 7.5 $ 58.5
Net interest expense on convertible notes and convertible preferred stock dividends                     0.1
Net income (loss) if-converted                 $ (540.7) $ 7.5 $ 58.6
Weighted average common shares                 122.5 114.7 112.9
Less: Weighted average unvested restricted stock                 1.7 1.9 1.5
Denominator for basic calculation 121.3 121.3 121.1 119.6 113.2 113.2 112.9 111.7 120.8 112.8 111.4
Stock compensation awards                 0.1 0.5 0.6
Convertible notes                 44.5 48.1 48.1
Convertible preferred stock - net allowable shares                 19.2 5.2  
Subtotal                 63.8 53.8 48.7
Less: shares excluded in a period of net loss (e)                 63.8    
Weighted average effect of dilutive securities                   53.8 48.7
Denominator for diluted calculation 121.3 121.3 121.1 119.6 177.6 166.4 161.4 111.7 120.8 166.6 160.1
Net income (loss) per share - basic $ (4.09) $ (0.06) $ (0.18) $ (0.14) $ 0.08 $ 0.01 $ 0.06 $ (0.09) $ (4.48) $ 0.07 $ 0.53
Net income (loss) per share - diluted $ (4.09) $ (0.06) $ (0.18) $ (0.14) $ 0.05 $ 0.01 $ 0.04 $ (0.09) $ (4.48) $ 0.05 $ 0.37