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Stock-Based Employee Compensation (Other Equity) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
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, 2013 (Share Units) 1,196,440    
Granted (Share Units) 489,840    
Vested (Share Units) (535,009)    
Canceled (Share Units) (162,266)    
Non-vested share units expected to vest as of December 31, 2013 (Share Units) 989,005 1,196,440  
Weighted-Average Grant Date Fair Value      
Non-vested share units at January 1, 2013 (Price per Share) $ 14.02    
Granted (Price per Share) $ 36.07 $ 30.03 $ 45.67
Vested (Price per Share) $ 35.93    
Canceled (Price per Share) $ 37.38    
Non-vested share units expected to vest as of December 31, 2013 (Price per Share) $ 9.26 $ 14.02  
Weighted-average estimated fair value of restricted stock units granted (Price per Share) $ 36.07 $ 30.03 $ 45.67
Fair value of shares released on vesting of restricted stock units $ 19.2 $ 18.8 $ 25.1
Total unrecognized compensation cost 9.4    
Weighted-average period of unrecognized compensation cost to be recognized (Years) 1 year 2 months 9 days    
Performance Shares
     
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, 2013 (Share Units) 288,493    
Granted (Share Units) 242,352    
Vested (Share Units) (3,021)    
Canceled (Share Units) (67,895)    
Non-vested share units expected to vest as of December 31, 2013 (Share Units) 459,929    
Weighted-Average Grant Date Fair Value      
Non-vested share units at January 1, 2013 (Price per Share) $ 30.78    
Granted (Price per Share) $ 35.98    
Vested (Price per Share) $ 41.79    
Canceled (Price per Share) $ 38.13    
Non-vested share units expected to vest as of December 31, 2013 (Price per Share) $ 32.36    
Weighted-average estimated fair value of restricted stock units granted (Price per Share) $ 35.98    
Total unrecognized compensation cost $ 8.1    
Weighted-average period of unrecognized compensation cost to be recognized (Years) 1 year 7 months 6 days