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Stock-Based Employee Compensation (Other Equity) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
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 801,835    
Granted (in shares) | shares 598,433    
Vested (in shares) | shares (315,541)    
Canceled (in shares) | shares (112,135)    
Non-vested share units, ending balance (in shares) | shares 972,592 801,835  
Weighted-Average Grant Date Fair Value      
Non-vested share units, beginning balance (in dollars per share) $ 108.48    
Granted (in dollars per share) 78.51 $ 112.13 $ 122.12
Vested (in dollars per share) 104.38    
Canceled (in dollars per share) 109.43    
Non-vested share units, ending balance (in dollars per share) 91.26 108.48  
Weighted-average estimated fair value of restricted stock units granted (in dollars per share) $ 78.51 $ 112.13 $ 122.12
Fair value of shares released on vesting of restricted stock units | $ $ 31.2 $ 30.8 $ 33.9
Total unrecognized compensation cost | $ $ 42.3    
Weighted-average period of unrecognized compensation cost to be recognized (Years) 1 year 1 month 24 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 286,017    
Granted (in shares) | shares 245,417    
Vested (in shares) | shares (221,016)    
Canceled (in shares) | shares (42,696)    
Non-vested share units, ending balance (in shares) | shares 267,722 286,017  
Weighted-Average Grant Date Fair Value      
Non-vested share units, beginning balance (in dollars per share) $ 105.76    
Granted (in dollars per share) 95.81 $ 87.39 $ 97.98
Vested (in dollars per share) 89.41    
Canceled (in dollars per share) 110.72    
Non-vested share units, ending balance (in dollars per share) 109.34 105.76  
Weighted-average estimated fair value of restricted stock units granted (in dollars per share) $ 95.81 $ 87.39 $ 97.98
Fair value of shares released on vesting of restricted stock units | $ $ 24.6 $ 23.0 $ 27.3
Total unrecognized compensation cost | $ $ 7.0    
Weighted-average period of unrecognized compensation cost to be recognized (Years) 1 year 3 months 25 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)   $ 118.08 $ 129.23
Weighted-average estimated fair value of restricted stock units granted (in dollars per share)   $ 118.08 $ 129.23
Total unrecognized compensation cost | $ $ 2.2    
Weighted-average period of unrecognized compensation cost to be recognized (Years) 1 year 4 months 13 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 452,456    
Granted (in shares) | shares 260,924    
Vested (in shares) | shares (137,948)    
Canceled (in shares) | shares 0    
Non-vested share units, ending balance (in shares) | shares 575,432 452,456  
Weighted-Average Grant Date Fair Value      
Non-vested share units, beginning balance (in dollars per share) $ 114.01    
Granted (in dollars per share) 110.21    
Vested (in dollars per share) 95.04    
Canceled (in dollars per share) 0    
Non-vested share units, ending balance (in dollars per share) 116.83 $ 114.01  
Weighted-average estimated fair value of restricted stock units granted (in dollars per share) $ 110.21