Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Feb. 28, 2023
Earnings Per Share [Abstract]
Net income	$ 140.0	$ 173.8
Weighted average common shares outstanding (in shares)	74,500,000	74,400,000
Dilutive effect of equity awards, based on the treasury stock method (in shares)	1,200,000	1,600,000
Weighted average shares assuming dilution (in shares)	75,700,000	76,000,000.0
Antidilutive options excluded from computation of diluted net income per share (in shares)	300,000	0
Stock repurchase program, authorized repurchase amount			$ 1,000.0
Stock repurchase program, shares purchased (in shares)	183,360	390,000
Stock purchase program, cost of shares purchased	$ 60.1	$ 147.1
Stock repurchase program, average price per share (in dollars per share)	$ 327.90	$ 377.23