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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
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Net Income Per Share        
Net (loss) from continuing operations $ (23.7) $ (29.3)    
Net income from discontinued operations 21.7 0.5    
Net (loss) (2.0) (28.8) (1,200.0) (491.1)
Net (loss) from continuing operations - if converted (23.7) (29.3)    
Net income from discontinued operations - if converted 21.7 0.5    
Net (loss) - if converted $ (2.0) $ (28.8)    
Weighted average common shares 125.1 123.1    
Less: Weighted average unvested restricted stock 2.0 0.8    
Denominator for basic calculation 123.1 122.3    
Convertible notes 44.3 44.3    
Convertible preferred stock - equivalent common shares 195.6 75.6    
Convertible preferred stock - less: share issuance limitation 172.8 52.8    
Convertible preferred stock - net allowable shares 22.8 22.8    
Subtotal 67.1 67.1    
Less: shares excluded in a period of net loss or antidilution 67.1 67.1    
Denominator for diluted calculation 123.1 122.3    
Net (loss) per share from continuing operations - basic and diluted $ (0.19) $ (0.24)    
Net income per share from discontinued operations - basic and diluted $ 0.18      
Net (loss) per share - basic and diluted $ (0.02) $ (0.24)