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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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net Income Per Share        
Net (loss) $ (92.0) $ (21.2) $ (120.8) $ (37.8)
Net income (loss) if-converted $ (92.0) $ (21.2) $ (120.8) $ (37.8)
Weighted average common shares 124.3 122.8 123.7 122.1
Less: Weighted average unvested restricted stock 2.6 1.7 1.7 1.8
Denominator for basic calculation 121.7 121.1 122.0 120.3
Stock compensation awards   0.1   3.1
Convertible notes 44.3 44.3 44.3 44.6
Convertible preferred stock - equivalent common shares 76.7 17.4 22.8 15.5
Convertible preferred stock - less: share issuance limitation 53.9      
Convertible preferred stock - net allowable shares 22.8 17.4 22.8 15.5
Subtotal 67.1 61.8 67.1 63.2
Less: shares excluded in a period of net loss (e) 67.1 61.8 67.1 63.2
Denominator for diluted calculation 121.7 121.1 122.0 120.3
Net (loss) per share - basic $ (0.76) $ (0.18) $ (0.99) $ (0.31)
Net (loss) per share - diluted $ (0.76) $ (0.18) $ (0.99) $ (0.31)