Stock-Based Compensation - Nonvested Performance-based Award Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Non-Employee Directors | Deferred Compensation, Share-based Payments
Non-vested PSU Awards [Roll Forward]
Granted at target level (in shares)	6,034	10,302
Non-vested PSU Awards, Weighted Average Fair Value [Roll Forward]
Granted at target level (in dollars per share)	$ 338.38	$ 194.29
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)	144,488
Average remaining term of shares issued at conversion	1 year
Non-vested PSU Awards [Roll Forward]
Outstanding, beginning (in shares)	222,799	264,622	296,037
Granted at target level (in shares)	37,701	53,659	84,309
Adjustments above/(below) target (in shares)	50,965	(14,004)	(50,556)
Vested and converted (in shares)	(143,465)	(70,074)	(48,964)
Forfeited (in shares)	(3,526)	(11,404)	(16,204)
Outstanding, ending (in shares)	164,474	222,799	264,622
Non-vested PSU Awards, Weighted Average Fair Value [Roll Forward]
Outstanding, beginning (in dollars per share)	$ 116.37	$ 92.80	$ 76.84
Granted at target level (in dollars per share)	333.58	177.31	103.40
Adjustments above/(below) target (in dollars per share)	93.38	77.02	83.89
Vested and converted (in dollars per share)	272.65	173.22	102.51
Forfeited (in dollars per share)	152.30	104.43	69.09
Outstanding, ending (in dollars per share)	$ 179.88	$ 116.37	$ 92.80
Stock-settled PSU awards | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Actual payout range	0.00%
Stock-settled PSU awards | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Actual payout range	200.00%
Cash-Settled PSU Awards
Non-vested PSU Awards [Roll Forward]
Outstanding, beginning (in shares)	2,112	1,981	1,592
Granted at target level (in shares)	163	732	806
Adjustments above/(below) target (in shares)	311	(99)	(206)
Vested and converted (in shares)	(877)	(502)	(211)
Forfeited (in shares)	(391)	0	0
Outstanding, ending (in shares)	1,318	2,112	1,981
Non-vested PSU Awards, Weighted Average Fair Value [Roll Forward]
Outstanding, beginning (in dollars per share)	$ 130.13	$ 93.28	$ 79.48
Granted at target level (in dollars per share)	320.12	190.71	102.51
Adjustments above/(below) target (in dollars per share)	91.40	74.43	56.95
Vested and converted (in dollars per share)	274.29	173.22	102.51
Forfeited (in dollars per share)	135.64	0	0
Outstanding, ending (in dollars per share)	$ 169.53	$ 130.13	$ 93.28
Restricted Stock
Non-vested PSU Awards [Roll Forward]
Granted at target level (in shares)	6,002	8,721	13,308
Non-vested PSU Awards, Weighted Average Fair Value [Roll Forward]
Granted at target level (in dollars per share)	$ 312.41	$ 200.35	$ 116.39