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, 2021			52.0
Balance at the beginning of the period at Dec. 31, 2021		$ 2,629.5	$ 78.7	$ 481.5	$ (105.2)	$ 4,237.7	$ (2,063.2)
Balance at beginning (in shares) at Dec. 31, 2021							26.4
Increase (Decrease) in Shareholders' Equity
Net income		193.6				193.6
Other comprehensive income (loss), net of tax		3.8			3.8
Dividends		(28.7)				(28.7)
Repurchases of common stock (in shares)			(0.5)				(0.5)
Repurchases of common stock		(125.0)					$ (125.0)
Issuances and deferrals, net for stock-based compensation (in shares)	[1]		(0.1)				(0.1)
Issuances and deferrals. net for stock-based compensation	[1]	5.4		2.0			$ 3.4
Balance at ending (in shares) at Mar. 31, 2022			51.6
Balance at the end of the period at Mar. 31, 2022		$ 2,678.6	$ 78.7	483.5	(101.4)	4,402.6	$ (2,184.8)
Balance at ending (in shares) at Mar. 31, 2022							26.8
Balance at beginning (in shares) at Dec. 31, 2022		50.9	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					27.5
Increase (Decrease) in Shareholders' Equity
Net income		$ 101.7				101.7
Other comprehensive income (loss), 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	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					27.6

[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.