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Stock-Based Employee Compensation (Other Equity) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based awards conversion ratio 1    
Number of Awards      
Non-vested share units, beginning balance (in shares) | shares 737,899    
Granted (in shares) | shares 392,427    
Vested (in shares) | shares (276,059)    
Canceled (in shares) | shares (53,682)    
Non-vested share units, ending balance (in shares) | shares 800,585 737,899  
Weighted-Average Grant Date Fair Value      
Non-vested share units, beginning balance (in dollars per share) $ 83.78    
Granted (in dollars per share) 122.12 $ 99.03 $ 64.51
Vested (in dollars per share) 78.09    
Canceled (in dollars per share) 101.82    
Non-vested share units, ending balance (in dollars per share) 103.32 83.78  
Weighted-average estimated fair value of restricted stock units granted (in dollars per share) $ 122.12 $ 99.03 $ 64.51
Fair value of shares released on vesting of restricted stock units | $ $ 33.9 $ 38.7 $ 23.2
Total unrecognized compensation cost | $ $ 43.1    
Weighted-average period of unrecognized compensation cost to be recognized (Years) 1 year 8 months 5 days    
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based awards conversion ratio 1    
Number of Awards      
Non-vested share units, beginning balance (in shares) | shares 353,150    
Granted (in shares) | shares 184,550    
Vested (in shares) | shares (218,568)    
Canceled (in shares) | shares (16,571)    
Non-vested share units, ending balance (in shares) | shares 302,561 353,150  
Weighted-Average Grant Date Fair Value      
Non-vested share units, beginning balance (in dollars per share) $ 74.87    
Granted (in dollars per share) 97.98 $ 84.16 $ 65.83
Vested (in dollars per share) 72.79    
Canceled (in dollars per share) 109.46    
Non-vested share units, ending balance (in dollars per share) 88.57 74.87  
Weighted-average estimated fair value of restricted stock units granted (in dollars per share) $ 97.98 $ 84.16 $ 65.83
Fair value of shares released on vesting of restricted stock units | $ $ 27.3 $ 10.0 $ 16.9
Total unrecognized compensation cost | $ $ 7.7    
Weighted-average period of unrecognized compensation cost to be recognized (Years) 1 year    
Maximum actual number of shares underlying each performance share award as a percentage of target performance shares 200.00%    
Restricted Stock      
Number of Awards      
Granted (in shares) | shares 120,022    
Weighted-Average Grant Date Fair Value      
Maximum actual number of shares underlying each performance share award as a percentage of target performance shares 200.00%    
Senior Officers | Restricted Stock      
Number of Awards      
Non-vested share units, beginning balance (in shares) | shares 270,176    
Granted (in shares) | shares 120,022    
Vested (in shares) | shares 0    
Canceled (in shares) | shares 0    
Non-vested share units, ending balance (in shares) | shares 390,198 270,176  
Weighted-Average Grant Date Fair Value      
Non-vested share units, beginning balance (in dollars per share) $ 81.28    
Granted (in dollars per share) 129.23 $ 95.04 $ 66.93
Vested (in dollars per share) 0.00    
Canceled (in dollars per share) 0.00    
Non-vested share units, ending balance (in dollars per share) 96.03 81.28  
Weighted-average estimated fair value of restricted stock units granted (in dollars per share) $ 129.23 $ 95.04 $ 66.93
Total unrecognized compensation cost | $ $ 1.6    
Weighted-average period of unrecognized compensation cost to be recognized (Years) 1 year 29 days