Condensed Consolidated Statements of Stockholders’ Equity (Unaudited) - USD ($) shares in Millions, $ in Millions		Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Shares in Treasury
Balance at beginning (in shares) at Dec. 31, 2022			50.9
Balance at the beginning of the period at Dec. 31, 2022		$ 3,024.4	$ 78.7	$ 512.6	$ (157.8)	$ 5,027.1	$ (2,436.2)
Balance at beginning (in shares) at Dec. 31, 2022							27.5
Increase (Decrease) in Shareholders' Equity
Net income		101.7				101.7
Other comprehensive (loss) income, net of tax		15.2			15.2
Dividends		(39.0)				(39.0)
Repurchases of common stock (in shares)			(0.2)				(0.2)
Repurchases of common stock		(50.2)					$ (50.2)
Issuances and deferrals, net for stock-based compensation (in shares)	[1]		(0.1)				(0.1)
Issuances and deferrals. net for stock-based compensation	[1]	6.2		3.4			$ 2.8
Balance at ending (in shares) at Mar. 31, 2023			50.8
Balance at the end of the period at Mar. 31, 2023		$ 3,058.3	$ 78.7	516.0	(142.6)	5,089.8	$ (2,483.6)
Balance at ending (in shares) at Mar. 31, 2023							27.6
Balance at beginning (in shares) at Dec. 31, 2023		47.7	47.7
Balance at the beginning of the period at Dec. 31, 2023		$ 2,829.0	$ 78.7	553.8	(111.1)	5,634.0	$ (3,326.4)
Balance at beginning (in shares) at Dec. 31, 2023		30.9					30.9
Increase (Decrease) in Shareholders' Equity
Net income		$ 192.3				192.3
Other comprehensive (loss) income, net of tax		(8.2)			(8.2)
Dividends		(41.5)				(41.5)
Repurchases of common stock (in shares)			(0.5)				(0.5)
Repurchases of common stock		(150.5)					$ (150.5)
Issuances and deferrals, net for stock-based compensation (in shares)	[1]		(0.4)				(0.4)
Issuances and deferrals. net for stock-based compensation	[1]	$ 38.2		9.0			$ 29.2
Balance at ending (in shares) at Mar. 31, 2024		47.6	47.6
Balance at the end of the period at Mar. 31, 2024		$ 2,859.3	$ 78.7	$ 562.8	$ (119.3)	$ 5,784.8	$ (3,447.7)
Balance at ending (in shares) at Mar. 31, 2024		31.0					31.0

[1] Issuances and deferrals, net for stock-based compensation, reflects share activity related to option exercises, restricted and performance shares vested, and net issuances and deferrals associated with deferred compensation equity.