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Share-Based Compensation (Share-Based Compensation Restricted Units) (Details) - $ / shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Number of Restricted Share Units      
Restricted share units outstanding, beginning balance (in shares) 570,822 552,788 619,150
Granted (in shares) 73,560 189,318 110,755
Vested (in shares) (146,138) (138,420) (140,089)
Forfeited (in shares) (22,197) (32,864) (37,028)
Restricted share units outstanding, ending balance (in shares) 476,047 570,822 552,788
Weighted-Average Grant-Date Fair Value      
Restricted share units outstanding, beginning balance (in USD per share) $ 251.95 $ 218.11 $ 213.29
Granted (in USD per share) 344.74 321.17 222.27
Vested (in USD per share) (240.71) (216.63) (200.88)
Forfeited (in USD per share) (256.50) (221.32) (215.08)
Restricted share units outstanding, ending balance (in USD per share) $ 269.52 $ 251.95 $ 218.11
Service-Based      
Number of Restricted Share Units      
Restricted share units outstanding, beginning balance (in shares) 524,572 552,788 619,150
Granted (in shares) 51,575 143,068 110,755
Vested (in shares) (146,138) (138,420) (140,089)
Forfeited (in shares) (22,197) (32,864) (37,028)
Restricted share units outstanding, ending balance (in shares) 407,812 524,572 552,788
Weighted-Average Grant-Date Fair Value      
Restricted share units outstanding, beginning balance (in USD per share) $ 249.90 $ 218.11 $ 213.29
Granted (in USD per share) 293.43 336.06 222.27
Vested (in USD per share) (240.71) (216.63) (200.88)
Forfeited (in USD per share) (256.50) (221.32) (215.08)
Restricted share units outstanding, ending balance (in USD per share) $ 258.34 $ 249.90 $ 218.11
Performance-Based      
Number of Restricted Share Units      
Restricted share units outstanding, beginning balance (in shares) 46,250 0 0
Granted (in shares) 21,985 46,250  
Restricted share units outstanding, ending balance (in shares) 68,235 46,250 0
Weighted-Average Grant-Date Fair Value      
Restricted share units outstanding, beginning balance (in USD per share) $ 275.12 $ 0 $ 0
Granted (in USD per share) 465.11 275.12 0
Restricted share units outstanding, ending balance (in USD per share) $ 336.33 $ 275.12 $ 0