Net Income Per Share - Narratives (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Feb. 28, 2023
Earnings Per Share [Abstract]
Antidilutive options excluded from computation of diluted net income per share (in shares)			200,000	200,000	0
Stock repurchase program, shares authorized (in shares)		650,000		650,000		1,000,000,000
Shares purchased under share repurchase program (in shares)	512,262	0	1,265,661	563,334
Shares purchased under share repurchase program	$ 177.0		$ 438.3	$ 202.8	$ 137.1
Shares purchased under share repurchase program, average cost per share (in dollars per share)	$ 345.56		$ 346.34	$ 360.03