Shareholder's Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)			75,300,000				75,300,000
Beginning balance	$ 2,576.8	$ 2,680.6	$ 2,881.0	$ 2,746.7	$ 2,776.2	$ 2,684.9	$ 2,881.0	$ 2,684.9
Beginning balance (in shares)			1,800,000				1,800,000
Net income	136.0	111.3	$ 115.3	161.3	155.1	140.0	$ 362.6	$ 456.4
Activity related to stock-based compensation	$ 11.1	11.1	14.4	$ 27.5	18.0	11.0
Shares purchased under share repurchase program (in shares)	170,771			77,329			1,409,786	753,399
Shares purchased under share repurchase program	$ (52.4)	(187.1)	(267.0)	$ (27.8)	(173.4)	(60.1)	$ (506.5)	$ (261.3)
Dividends declared		(14.5)	(14.6)		(14.1)	(14.2)
Other comprehensive income (loss), net of tax	$ 80.6	(24.6)	(48.5)	(39.5)	(15.1)	14.6	$ 7.5	(40.0)
Ending balance (in shares)	75,300,000						75,300,000
Ending balance	$ 2,752.1	$ 2,576.8	$ 2,680.6	$ 2,868.2	$ 2,746.7	$ 2,776.2	$ 2,752.1	$ 2,868.2
Ending balance (in shares)	2,800,000						2,800,000
Dividends declared per share (in dollars per share)		$ 0.20	$ 0.20		$ 0.19	$ 0.19
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	75,300,000	75,300,000	75,300,000	75,300,000	75,300,000	75,300,000	75,300,000	75,300,000
Beginning balance	$ 18.8	$ 18.8	$ 18.8	$ 18.8	$ 18.8	$ 18.8	$ 18.8	$ 18.8
Ending balance (in shares)	75,300,000	75,300,000	75,300,000	75,300,000	75,300,000	75,300,000	75,300,000	75,300,000
Ending balance	$ 18.8	$ 18.8	$ 18.8	$ 18.8	$ 18.8	$ 18.8	$ 18.8	$ 18.8
Capital in Excess of Par Value
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	33.5	55.2	120.2	158.2	181.4	232.2	120.2	232.2
Activity related to stock-based compensation	(10.2)	(21.7)	(65.0)	(35.6)	(23.2)	(50.8)
Ending balance	23.3	33.5	55.2	122.6	158.2	181.4	23.3	122.6
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ (979.5)	$ (825.2)	$ (637.6)	$ (501.4)	$ (369.2)	$ (370.9)	$ (637.6)	$ (370.9)
Beginning balance (in shares)	2,700,000	2,300,000	1,800,000	1,400,000	1,100,000	1,200,000	1,800,000	1,200,000
Activity related to stock-based compensation	$ 21.3	$ 32.8	$ 79.4	$ 63.1	$ 41.2	$ 61.8
Activity related to stock -based compensation (in shares)	(100,000)	(100,000)	(200,000)	(200,000)	(200,000)	(300,000)
Shares purchased under share repurchase program (in shares)	200,000	500,000	700,000	100,000	500,000	200,000
Shares purchased under share repurchase program	$ (52.4)	$ (187.1)	$ (267.0)	$ (27.8)	$ (173.4)	$ (60.1)
Ending balance	$ (1,010.6)	$ (979.5)	$ (825.2)	$ (466.1)	$ (501.4)	$ (369.2)	$ (1,010.6)	$ (466.1)
Ending balance (in shares)	2,800,000	2,700,000	2,300,000	1,300,000	1,400,000	1,100,000	2,800,000	1,300,000
Retained earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 3,720.9	$ 3,624.1	$ 3,523.4	$ 3,254.6	$ 3,113.6	$ 2,987.8	$ 3,523.4	$ 2,987.8
Net income	136.0	111.3	115.3	161.3	155.1	140.0
Dividends declared		(14.5)	(14.6)		(14.1)	(14.2)
Ending balance	3,856.9	3,720.9	3,624.1	3,415.9	3,254.6	3,113.6	3,856.9	3,415.9
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(216.9)	(192.3)	(143.8)	(183.5)	(168.4)	(183.0)	(143.8)	(183.0)
Other comprehensive income (loss), net of tax	80.6	(24.6)	(48.5)	(39.5)	(15.1)	14.6
Ending balance	$ (136.3)	$ (216.9)	$ (192.3)	$ (223.0)	$ (183.5)	$ (168.4)	$ (136.3)	$ (223.0)