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Stock-Based Employee Compensation (Other Equity) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
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, 2015 (Share Units) | shares 981,553    
Granted (Share Units) | shares 298,998    
Vested (Share Units) | shares (361,843)    
Canceled (Share Units) | shares (98,059)    
Non-vested share units expected to vest as of December 31, 2015 (Share Units) | shares 820,649 981,553  
Weighted-Average Grant Date Fair Value      
Non-vested share units at January 1, 2015 (Price per Share) $ 42.68    
Granted (Price per Share) 73.98 $ 54.60 $ 36.07
Vested (Price per Share) 40.04    
Canceled (Price per Share) 45.07    
Non-vested share units expected to vest as of December 31, 2015 (Price per Share) 54.98 42.68  
Weighted-average estimated fair value of restricted stock units granted (Price per Share) $ 73.98 $ 54.60 $ 36.07
Fair value of shares released on vesting of restricted stock units | $ $ 27.6 $ 20.7 $ 19.2
Total unrecognized compensation cost | $ $ 14.4    
Weighted-average period of unrecognized compensation cost to be recognized (Years) 1 year 1 month 18 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, 2015 (Share Units) | shares 658,886    
Granted (Share Units) | shares 161,479 63,771  
Vested (Share Units) | shares (241,288)    
Canceled (Share Units) | shares (74,866)    
Non-vested share units expected to vest as of December 31, 2015 (Share Units) | shares 504,211 658,886  
Weighted-Average Grant Date Fair Value      
Non-vested share units at January 1, 2015 (Price per Share) $ 40.21    
Granted (Price per Share) 71.36 $ 56.72 $ 35.98
Vested (Price per Share) 33.94    
Canceled (Price per Share) 37.59    
Non-vested share units expected to vest as of December 31, 2015 (Price per Share) 53.57 40.21  
Weighted-average estimated fair value of restricted stock units granted (Price per Share) $ 71.36 $ 56.72 $ 35.98
Fair value of shares released on vesting of restricted stock units | $ $ 18.3 $ 0.4 $ 0.1
Total unrecognized compensation cost | $ $ 11.4    
Weighted-average period of unrecognized compensation cost to be recognized (Years) 9 months 23 days