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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
Mar. 31, 2012
Mar. 31, 2011
Net Income Per Share    
Net (loss) $ (28.8) $ (16.6)
Net income (loss) if-converted $ (28.8) $ (16.6)
Weighted average common shares 123.1 121.4
Less: Weighted average unvested restricted stock 0.8 1.8
Denominator for basic calculation 122.3 119.6
Stock compensation awards   6.2
Convertible notes 44.3 44.9
Convertible preferred stock - equivalent common shares 75.6 13.6
Convertible preferred stock - less: share issuance limitation 52.8  
Convertible preferred stock - net allowable shares 22.8 13.6
Subtotal 67.1 64.7
Less: shares excluded in a period of net loss (e) 67.1 64.7
Denominator for diluted calculation 122.3 119.6
Net (loss) per share - basic $ (0.24) $ (0.14)
Net (loss) per share - diluted $ (0.24) $ (0.14)