Shareholder's Equity - Change in Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 2,680.6	$ 2,881.0	$ 2,776.2	$ 2,684.9	$ 2,881.0	$ 2,684.9
Beginning balance (in shares)		1,800,000			1,800,000
Net income	111.3	$ 115.3	155.1	140.0	$ 226.6	$ 295.1
Activity related to stock-based compensation	$ 11.1	14.4	$ 18.0	11.0
Share purchased under share repurchase program (in shares)	509,336		492,710		1,239,015	676,070
Shares purchased under share repurchase program	$ (187.1)	(267.0)	$ (173.4)	(60.1)	$ (454.1)	$ (233.5)
Dividends declared	(14.5)	(14.6)	(14.1)	(14.2)
Other comprehensive (loss) income, net of tax	(24.6)	(48.5)	(15.1)	14.6	(73.1)	(0.5)
Ending balance	$ 2,576.8	$ 2,680.6	$ 2,746.7	$ 2,776.2	$ 2,576.8	$ 2,746.7
Ending balance (in shares)	2,700,000				2,700,000
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
Beginning balance	$ 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
Ending balance	$ 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	55.2	120.2	181.4	232.2	120.2	232.2
Activity related to stock-based compensation	(21.7)	(65.0)	(23.2)	(50.8)
Ending balance	33.5	55.2	158.2	181.4	33.5	158.2
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ (825.2)	$ (637.6)	$ (369.2)	$ (370.9)	$ (637.6)	$ (370.9)
Beginning balance (in shares)	2,300,000	1,800,000	1,100,000	1,200,000	1,800,000	1,200,000
Activity related to stock-based compensation	$ 32.8	$ 79.4	$ 41.2	$ 61.8
Activity related to stock -based compensation (in shares)	(100,000)	(200,000)	(200,000)	(300,000)
Share purchased under share repurchase program (in shares)	500,000	700,000	500,000	200,000
Shares purchased under share repurchase program	$ (187.1)	$ (267.0)	$ (173.4)	$ (60.1)
Ending balance	$ (979.5)	$ (825.2)	$ (501.4)	$ (369.2)	$ (979.5)	$ (501.4)
Ending balance (in shares)	2,700,000	2,300,000	1,400,000	1,100,000	2,700,000	1,400,000
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 3,624.1	$ 3,523.4	$ 3,113.6	$ 2,987.8	$ 3,523.4	$ 2,987.8
Net income	111.3	115.3	155.1	140.0
Dividends declared	(14.5)	(14.6)	(14.1)	(14.2)
Ending balance	3,720.9	3,624.1	3,254.6	3,113.6	3,720.9	3,254.6
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(192.3)	(143.8)	(168.4)	(183.0)	(143.8)	(183.0)
Other comprehensive (loss) income, net of tax	(24.6)	(48.5)	(15.1)	14.6
Ending balance	$ (216.9)	$ (192.3)	$ (183.5)	$ (168.4)	$ (216.9)	$ (183.5)