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Stock-Based Employee Compensation (Other Equity) (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
Weighted-Average Grant Date Fair Value      
Total unrecognized compensation cost | $ $ 0    
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 800,585    
Granted (in shares) | shares 293,707    
Vested (in shares) | shares (267,134)    
Canceled (in shares) | shares (25,323)    
Non-vested share units, ending balance (in shares) | shares 801,835 800,585  
Weighted-Average Grant Date Fair Value      
Non-vested share units, beginning balance (in dollars per share) $ 103.32    
Granted (in dollars per share) 112.13 $ 122.12 $ 99.03
Vested (in dollars per share) 96.96    
Canceled (in dollars per share) 109.32    
Non-vested share units, ending balance (in dollars per share) 88.97 103.32  
Weighted-average estimated fair value of restricted stock units granted (in dollars per share) $ 112.13 $ 122.12 $ 99.03
Fair value of shares released on vesting of restricted stock units | $ $ 30,800,000 $ 33,900,000 $ 38,700,000
Total unrecognized compensation cost | $ $ 37,100,000    
Weighted-average period of unrecognized compensation cost to be recognized (Years) 1 year 4 months 20 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 302,561    
Granted (in shares) | shares 187,924    
Vested (in shares) | shares (198,537)    
Canceled (in shares) | shares (5,931)    
Non-vested share units, ending balance (in shares) | shares 286,017 302,561  
Weighted-Average Grant Date Fair Value      
Non-vested share units, beginning balance (in dollars per share) $ 88.57    
Granted (in dollars per share) 87.39 $ 97.98 $ 84.16
Vested (in dollars per share) 62.49    
Canceled (in dollars per share) 95.12    
Non-vested share units, ending balance (in dollars per share) 105.76 88.57  
Weighted-average estimated fair value of restricted stock units granted (in dollars per share) $ 87.39 $ 97.98 $ 84.16
Fair value of shares released on vesting of restricted stock units | $ $ 23,000,000.0 $ 27,300,000 $ 10,000,000.0
Total unrecognized compensation cost | $ $ 10,000,000.0    
Weighted-average period of unrecognized compensation cost to be recognized (Years) 1 year 21 days    
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 194,486    
Weighted-Average Grant Date Fair Value      
Granted (in dollars per share)   $ 129.23 $ 95.04
Weighted-average estimated fair value of restricted stock units granted (in dollars per share)   $ 129.23 $ 95.04
Total unrecognized compensation cost | $ $ 3,200,000    
Weighted-average period of unrecognized compensation cost to be recognized (Years) 1 year 2 months 26 days    
Maximum actual number of shares underlying each performance share award as a percentage of target performance shares 200.00%    
Restricted Stock | Senior Officers      
Number of Awards      
Non-vested share units, beginning balance (in shares) | shares 390,198    
Granted (in shares) | shares 194,486    
Vested (in shares) | shares (120,329)    
Canceled (in shares) | shares (11,899)    
Non-vested share units, ending balance (in shares) | shares 452,456 390,198  
Weighted-Average Grant Date Fair Value      
Non-vested share units, beginning balance (in dollars per share) $ 96.03    
Granted (in dollars per share) 118.08    
Vested (in dollars per share) 66.93    
Canceled (in dollars per share) 66.93    
Non-vested share units, ending balance (in dollars per share) 114.01 $ 96.03  
Weighted-average estimated fair value of restricted stock units granted (in dollars per share) $ 118.08