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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

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Aggregate Grant Date Fair Value

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Number of shares related to Restricted Stock Award forfeited during the period.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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