Shareholder's Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)		75,300,000			75,300,000
Beginning balance	$ 2,683.1	$ 2,682.3	$ 2,680.6	$ 2,881.0	$ 2,682.3	$ 2,881.0
Beginning balance (in shares)		3,000,000.0			3,000,000.0
Net income	131.8	$ 89.8	111.3	115.3	$ 221.6	$ 226.6
Activity related to stock-based compensation	$ 12.9	7.1	$ 11.1	14.4
Shares purchased under share repurchase program (in shares)	2,312		509,336		552,593	1,239,015
Shares purchased under share repurchase program	$ (0.5)	(133.5)	$ (187.1)	(267.0)	$ (134.0)	$ (454.1)
Dividends declared	(15.0)	(15.2)	(14.5)	(14.6)
Other comprehensive income (loss), net of tax	$ 116.8	52.6	(24.6)	(48.5)	$ 169.4	(73.1)
Ending balance (in shares)	75,300,000				75,300,000
Ending balance	$ 2,929.1	$ 2,683.1	$ 2,576.8	$ 2,680.6	$ 2,929.1	$ 2,576.8
Ending balance (in shares)	3,400,000				3,400,000
Dividends declared per share (in dollars per share)	$ 0.21	$ 0.21	$ 0.20	$ 0.20
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	1.8	22.1	55.2	120.2	22.1	120.2
Activity related to stock-based compensation	(1.8)	(20.3)	(21.7)	(65.0)
Ending balance	0.0	1.8	33.5	55.2	0.0	33.5
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ (1,163.2)	$ (1,057.1)	$ (825.2)	$ (637.6)	$ (1,057.1)	$ (637.6)
Beginning balance (in shares)	3,500,000	3,000,000.0	2,300,000	1,800,000	3,000,000.0	1,800,000
Activity related to stock-based compensation	$ 23.5	$ 27.4	$ 32.8	$ 79.4
Activity related to stock -based compensation (in shares)	(100,000)	(100,000)	(100,000)	(200,000)
Shares purchased under share repurchase program (in shares)		600,000	500,000	700,000
Shares purchased under share repurchase program	$ (0.5)	$ (133.5)	$ (187.1)	$ (267.0)
Ending balance	$ (1,140.2)	$ (1,163.2)	$ (979.5)	$ (825.2)	$ (1,140.2)	$ (979.5)
Ending balance (in shares)	3,400,000	3,500,000	2,700,000	2,300,000	3,400,000	2,700,000
Retained earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 4,031.2	$ 3,956.6	$ 3,624.1	$ 3,523.4	$ 3,956.6	$ 3,523.4
Net income	131.8	89.8	111.3	115.3
Activity related to stock-based compensation	(8.8)
Dividends declared	(15.0)	(15.2)	(14.5)	(14.6)
Ending balance	4,139.2	4,031.2	3,720.9	3,624.1	4,139.2	3,720.9
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(205.5)	(258.1)	(192.3)	(143.8)	(258.1)	(143.8)
Other comprehensive income (loss), net of tax	116.8	52.6	(24.6)	(48.5)
Ending balance	$ (88.7)	$ (205.5)	$ (216.9)	$ (192.3)	$ (88.7)	$ (216.9)