Share-Based Compensation - STAP Awards (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Awards granted
Aggregate STAP liability	$ 29.2		$ 35.4
STAP awards
Awards granted
Grant expiration period from the grant date	10 years
Award vesting period	4 years
Weighted-average assumptions used to measure the fair value of the outstanding STAP awards:
Expected term of awards (in years)	10 months 24 days	10 months 24 days
Expected volatility	26.80%	28.60%
Risk-free interest rate (as a percent)	5.10%	4.60%
Expected dividend yield	0.00%	0.00%
Closing price of common stock (in dollars per share)	$ 229.72	$ 223.96	$ 219.89
Number of Awards
Outstanding at beginning of period (in shares)	443,058
Granted (in shares)	0
Exercised (in shares)	(75,764)
Forfeited (in shares)	0
Outstanding at end of period (in shares)	367,294
Exercisable at end of period (in shares)	367,294
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)	$ 149.21
Granted (in dollars per share)	0
Exercised (in dollars per share)	103.15
Forfeited (in dollars per share)	0
Outstanding at end of period (in dollars per share)	158.71
Exercisable at end of period (in dollars per share)	$ 158.71
Weighted Average Remaining Contractual Term (in Years)
Outstanding at end of year	10 months 24 days
Exercisable at end of period	10 months 24 days
Aggregate Intrinsic Value (in millions)
Outstanding at end of period	$ 26.1
Exercisable at end of period	$ 26.1