Shareholders' Equity - Change in Shareholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	$ 2,684.9	$ 2,335.4
Balance (in shares)	1,200,000
Net income	$ 140.0	173.8
Activity related to stock-based compensation	$ 11.0	$ 0.1
Share purchased under share repurchase program (in shares)	183,360	390,000
Shares purchased under share repurchase program	$ (60.1)	$ (147.1)
Dividends declared	(14.2)	(13.2)
Other comprehensive income (loss), net of tax	14.6	(22.8)
Balance, end of period	$ 2,776.2	$ 2,326.2
Balance (in shares)	1,100,000
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance (in shares)	75,300,000	75,300,000
Balance, beginning of period	$ 18.8	$ 18.8
Balance (in shares)	75,300,000	75,300,000
Balance, end of period	$ 18.8	$ 18.8
Capital in Excess of Par Value
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	232.2	249.0
Activity related to stock-based compensation	(50.8)	(29.1)
Balance, end of period	181.4	219.9
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	$ (370.9)	$ (229.5)
Balance (in shares)	1,200,000	1,100,000
Activity related to stock -based compensation (in shares)	(300,000)	(300,000)
Activity related to stock-based compensation	$ 61.8	$ 29.2
Share purchased under share repurchase program (in shares)	200,000	400,000
Shares purchased under share repurchase program	$ (60.1)	$ (147.1)
Balance, end of period	$ (369.2)	$ (347.4)
Balance (in shares)	1,100,000	1,200,000
Retained earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	$ 2,987.8	$ 2,456.7
Net income	140.0	173.8
Dividends declared	(14.2)	(13.2)
Balance, end of period	3,113.6	2,617.3
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning of period	(183.0)	(159.6)
Other comprehensive income (loss), net of tax	14.6	(22.8)
Balance, end of period	$ (168.4)	$ (182.4)