CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Millions	Total	Common stock	Capital in excess of par value	Treasury stock	Retained earnings	Accumulated other comprehensive loss
Beginning balance (in shares) at Dec. 31, 2020		75,300,000
Beginning balance at Dec. 31, 2020	$ 1,854.5	$ 18.8	$ 267.3	$ (167.7)	$ 1,846.7	$ (110.6)
Beginning balance (in shares) at Dec. 31, 2020				1,300,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	661.8				661.8
Activity related to stock-based compensation	57.0		(18.3)	$ 75.3
Activity related to stock-based compensation (in shares)				(700,000)
Shares purchased under share repurchase program (in shares)				500,000
Shares purchased under share repurchase program	(137.1)			$ (137.1)
Dividends declared	(51.8)				(51.8)
Other comprehensive income (loss), net of tax	(49.0)					(49.0)
Ending balance (in shares) at Dec. 31, 2021		75,300,000
Ending balance at Dec. 31, 2021	2,335.4	$ 18.8	249.0	$ (229.5)	2,456.7	(159.6)
Ending balance (in shares) at Dec. 31, 2021				1,100,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	585.9				585.9
Activity related to stock-based compensation	$ 44.6		(16.8)	$ 61.4
Activity related to stock-based compensation (in shares)				(500,000)
Shares purchased under share repurchase program (in shares)	563,334			600,000
Shares purchased under share repurchase program	$ (202.8)			$ (202.8)
Dividends declared	(54.8)				(54.8)
Other comprehensive income (loss), net of tax	(23.4)					(23.4)
Ending balance (in shares) at Dec. 31, 2022		75,300,000
Ending balance at Dec. 31, 2022	$ 2,684.9	$ 18.8	232.2	$ (370.9)	2,987.8	(183.0)
Ending balance (in shares) at Dec. 31, 2022	1,200,000			1,200,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 593.4				593.4
Activity related to stock-based compensation	$ 59.6		(112.0)	$ 171.6
Activity related to stock-based compensation (in shares)				(700,000)
Shares purchased under share repurchase program (in shares)	1,265,661			1,300,000
Shares purchased under share repurchase program	$ (438.3)			$ (438.3)
Dividends declared	(57.8)				(57.8)
Other comprehensive income (loss), net of tax	39.2					39.2
Ending balance (in shares) at Dec. 31, 2023		75,300,000
Ending balance at Dec. 31, 2023	$ 2,881.0	$ 18.8	$ 120.2	$ (637.6)	$ 3,523.4	$ (143.8)
Ending balance (in shares) at Dec. 31, 2023	1,800,000			1,800,000