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Stock-Based Compensation - Nonvested Performance-based Award Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Non-Employee Directors | Deferred Compensation, Share-based Payments      
Non-vested PSU Awards [Roll Forward]      
Granted at target level (in shares) 10,302    
Non-vested PSU Awards, Weighted Average Grant Date Fair Value [Roll Forward]      
Granted at target level (in dollars per share) $ 194.29    
Incentive Stock Awards      
Non-vested PSU Awards [Roll Forward]      
Granted at target level (in shares) 350 1,300 1,500
Forfeited (in shares) 0 0 (200)
Non-vested PSU Awards, Weighted Average Grant Date Fair Value [Roll Forward]      
Granted at target level (in dollars per share) $ 156.49 $ 106.14 $ 93.00
Stock-settled PSU awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares to be issued upon conversion (in shares) 92,792    
Average remaining term of shares issued at conversion 1 year    
Non-vested PSU Awards [Roll Forward]      
Outstanding, beginning (in shares) 264,622 296,037 341,944
Granted at target level (in shares) 53,659 84,309 102,307
Adjustments above/(below) target (in shares) (14,004) (50,556) (2,284)
Vested and converted (in shares) (70,074) (48,964) (121,984)
Forfeited (in shares) (11,404) (16,204) (23,946)
Outstanding, ending (in shares) 222,799 264,622 296,037
Non-vested PSU Awards, Weighted Average Grant Date Fair Value [Roll Forward]      
Outstanding, beginning (in dollars per share) $ 92.80 $ 76.84 $ 64.38
Granted at target level (in dollars per share) 177.31 103.40 90.45
Adjustments above/(below) target (in dollars per share) 77.02 83.89 33.86
Vested and converted (in dollars per share) 173.22 102.51 93.00
Forfeited (in dollars per share) 104.43 69.09 68.65
Outstanding, ending (in dollars per share) $ 116.37 $ 92.80 $ 76.84
Cash-Settled PSU Awards      
Non-vested PSU Awards [Roll Forward]      
Outstanding, beginning (in shares) 1,981 1,592 1,972
Granted at target level (in shares) 732 806 560
Adjustments above/(below) target (in shares) (99) (206) (30)
Vested and converted (in shares) (502) (211) (910)
Forfeited (in shares) 0 0 0
Outstanding, ending (in shares) 2,112 1,981 1,592
Non-vested PSU Awards, Weighted Average Grant Date Fair Value [Roll Forward]      
Outstanding, beginning (in dollars per share) $ 93.28 $ 79.48 $ 92.25
Granted at target level (in dollars per share) 190.71 102.51 89.64
Adjustments above/(below) target (in dollars per share) 74.43 56.95 41.53
Vested and converted (in dollars per share) 173.22 102.51 93.00
Forfeited (in dollars per share) 0 0 0
Outstanding, ending (in dollars per share) $ 130.13 $ 93.28 $ 79.48
Restricted Stock      
Non-vested PSU Awards [Roll Forward]      
Granted at target level (in shares) 8,721 13,308 15,942
Non-vested PSU Awards, Weighted Average Grant Date Fair Value [Roll Forward]      
Granted at target level (in dollars per share) $ 200.35 $ 116.39 $ 96.77
Minimum | Stock-settled PSU awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Actual payout range 0.00%    
Maximum | Stock-settled PSU awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Actual payout range 200.00%