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Stock-Based Employee Compensation (Details 5) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Restricted stock units
     
Share-based Compensation Arrangement by Share-based Payment Award      
Stock-based awards conversion ratio 1    
Number of Awards      
Non-vested share units at January 1, 2012 1,372,225    
Granted 599,163    
Vested (613,650)    
Canceled (161,298)    
Non-vested share units expected to vest as of December 31, 2012 1,196,440 1,372,225  
Weighted-Average Grant Date Fair Value      
Non-vested share units at January 1, 2012 $ 15.67    
Granted $ 30.03 $ 45.67 $ 25.32
Vested $ 30.19    
Canceled $ 26.00    
Non-vested share units expected to vest as of December 31, 2012 $ 14.02 $ 15.67  
Weighted-average estimated fair value of restricted stock units granted $ 30.03 $ 45.67 $ 25.32
Fair value of shares released on vesting of restricted stock units $ 18.8 $ 25.1 $ 12.0
Total unrecognized compensation cost 9.3    
Weighted-average period of unrecognized compensation cost to be recognized 1 year 1 month 6 days    
Performance Shares
     
Share-based Compensation Arrangement by Share-based Payment Award      
Stock-based awards conversion ratio 1    
Number of Awards      
Granted 329,088    
Canceled (40,595)    
Non-vested share units expected to vest as of December 31, 2012 288,493    
Weighted-Average Grant Date Fair Value      
Granted $ 30.16    
Canceled $ 25.74    
Non-vested share units expected to vest as of December 31, 2012 $ 30.78    
Weighted-average estimated fair value of restricted stock units granted $ 30.16    
Total unrecognized compensation cost $ 6.2    
Weighted-average period of unrecognized compensation cost to be recognized 2 years