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Net Income Per Share (Schedule of Income Per Share) (Details) (USD $)
In Millions, except Per Share data
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Net Income Per Share        
Net income (loss) $ (21.2) $ 7.2 $ (37.8) $ (2.5)
Net income (loss) if-converted $ (21.2) $ 7.2 $ (37.8) $ (2.5)
Weighted average common shares 122.8 114.9 122.1 114.3
Less: Weighted average unvested restricted stock 1.7 2.0 1.8 2.0
Denominator for basic calculation 121.1 112.9 120.3 112.3
Stock compensation awards   0.4    
Convertible notes   48.1    
Denominator for diluted calculation 121.1 161.4 120.3 112.3
Net income (loss) per share - basic $ (0.18) $ 0.06 $ (0.31) $ (0.02)
Net income (loss) per share - diluted $ (0.18) $ 0.04 $ (0.31) $ (0.02)