Equity Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Table of Performance Share Unit Monte Carlo Assumptions [Table Text Block]

	2023		2022		2021
Risk-free interest rate	4.71	%	4.58	%	0.61	%
Expected life in years	3		3		3
Expected volatility	27	%	26	%	25	%
Expected dividend yield	—		—		—

Schedule of Stock Options, Activity

	Number of Options	Weighted Average Exercise Price		Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2022	308,149	$	635.00	$	250.5
Granted	27,027	1,027.33
Exercised	(61,268)	313.93
Forfeited	(13,950)	787.01
Outstanding at December 31, 2023	259,958	$	743.30	$	127.2
Options exercisable at December 31, 2023	203,600	$	618.26	$	123.5

Schedule Shares Outstanding under Stock Option Plans, by Exercise Price Range

Number of Options Outstanding	Weighted Average Exercise Price		Remaining Contractual Life of Options Outstanding	Options Exercisable
113,857	$	431.30	3.11	116,997
101,714	$	839.04	6.46	70,316
44,387	$	1,324.22	8.09	16,287
259,958			5.27	203,600

Schedule of Stock Options, Valuation Assumptions

	2023		2022		2021
Risk-free interest rate	4.64	%	4.35	%	0.95	%
Expected life in years	6.7		6.4		6.3
Expected volatility	27	%	26	%	25	%
Expected dividend yield	—		—		—

Schedule Restricted Stock Units, Activity

	Number of Restricted Stock Units	Aggregate Intrinsic Value (in millions)	Number of Performance Share Units	Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2022	24,892	$36.0	12,282	$17.8
Granted	12,517		2,998
Adjustment for performance results achieved(1)	—		4,505
Vested	(8,798)		(9,010)
Forfeited	(1,872)		(364)
Outstanding at December 31, 2023	26,739	$32.4	10,411	$12.6