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Stock-Based Employee Compensation (Other Equity) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
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 972,592    
Granted (in shares) | shares 568,107    
Vested (in shares) | shares (448,469)    
Canceled (in shares) | shares (97,192)    
Non-vested share units, ending balance (in shares) | shares 995,038 972,592  
Weighted-Average Grant Date Fair Value      
Non-vested share units, beginning balance (in dollars per share) $ 91.26    
Granted (in dollars per share) 85.08 $ 78.51 $ 112.13
Vested (in dollars per share) 90.90    
Canceled (in dollars per share) 89.73    
Non-vested share units, ending balance (in dollars per share) 88.19 91.26  
Weighted-average estimated fair value of restricted stock units granted (in dollars per share) $ 85.08 $ 78.51 $ 112.13
Fair value of shares released on vesting of restricted stock units | $ $ 36.1 $ 31.2 $ 30.8
Total unrecognized compensation cost | $ $ 42.3    
Weighted-average period of unrecognized compensation cost to be recognized (Years) 1 year 1 month 28 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 267,722    
Granted (in shares) | shares 296,798    
Vested (in shares) | shares (66,377)    
Canceled (in shares) | shares (31,791)    
Non-vested share units, ending balance (in shares) | shares 466,352 267,722  
Weighted-Average Grant Date Fair Value      
Non-vested share units, beginning balance (in dollars per share) $ 109.34    
Granted (in dollars per share) 84.83 $ 95.81 $ 87.39
Vested (in dollars per share) 123.49    
Canceled (in dollars per share) 98.78    
Non-vested share units, ending balance (in dollars per share) 92.45 109.34  
Weighted-average estimated fair value of restricted stock units granted (in dollars per share) $ 84.83 $ 95.81 $ 87.39
Fair value of shares released on vesting of restricted stock units | $ $ 5.6 $ 24.6 $ 23.0
Total unrecognized compensation cost | $ $ 14.8    
Weighted-average period of unrecognized compensation cost to be recognized (Years) 1 year 6 months 3 days    
Maximum actual number of shares underlying each performance share award as a percentage of target performance shares 200.00%    
Restricted Stock      
Weighted-Average Grant Date Fair Value      
Granted (in dollars per share)   $ 110.21 $ 118.08
Weighted-average estimated fair value of restricted stock units granted (in dollars per share)   $ 110.21 $ 118.08
Total unrecognized compensation cost | $ $ 3.3    
Weighted-average period of unrecognized compensation cost to be recognized (Years) 1 year 4 months 9 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 575,432    
Granted (in shares) | shares 350,996    
Vested (in shares) | shares (60,011)    
Canceled (in shares) | shares (69,205)    
Non-vested share units, ending balance (in shares) | shares 797,212 575,432  
Weighted-Average Grant Date Fair Value      
Non-vested share units, beginning balance (in dollars per share) $ 116.83    
Granted (in dollars per share) 84.83    
Vested (in dollars per share) 129.23    
Canceled (in dollars per share) 123.33    
Non-vested share units, ending balance (in dollars per share) 101.25 $ 116.83  
Weighted-average estimated fair value of restricted stock units granted (in dollars per share) $ 84.83