Consolidated Statements of Shareholders’ Equity - USD ($) $ in Millions	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2023		64,100,000
Beginning balance at Dec. 31, 2023	$ 2,505.0	$ 6.4	$ 1,845.3	$ 1,014.3	$ (360.8)	$ (0.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	144.6			146.7		(2.1)
Other Comprehensive Income, Net of Tax	43.5				43.5
Cash Dividends and Dividend Equivalents to Shareholders	$ (39.8)			(39.8)
Repurchases of Common Stock (in shares)	0
Shares Issued Under Employee Stock Purchase Plan	$ 2.0		2.0
Equity-based Compensation Cost	19.5		19.5
Equity-based Awards, Net of Shares Exchanged (in shares)		300,000
Equity-based Awards, Net of Shares Exchanged	(5.9)		(5.9)
Other Changes in Non-Controlling Interest	0.4					0.4
Ending balance (in shares) at Jun. 30, 2024		64,400,000
Ending balance at Jun. 30, 2024	2,669.3	$ 6.4	1,860.9	1,121.2	(317.3)	(1.9)
Beginning balance (in shares) at Mar. 31, 2024		64,400,000
Beginning balance at Mar. 31, 2024	2,588.7	$ 6.4	1,852.3	1,066.1	(335.0)	(1.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	74.4			75.4		(1.0)
Other Comprehensive Income, Net of Tax	17.7				17.7
Cash Dividends and Dividend Equivalents to Shareholders	(20.3)			(20.3)
Shares Issued Under Employee Stock Purchase Plan	1.1		1.1
Equity-based Compensation Cost	7.3		7.3
Equity-based Awards, Net of Shares Exchanged	0.2		0.2
Other Changes in Non-Controlling Interest	0.2					0.2
Ending balance (in shares) at Jun. 30, 2024		64,400,000
Ending balance at Jun. 30, 2024	2,669.3	$ 6.4	1,860.9	1,121.2	(317.3)	(1.9)
Beginning balance (in shares) at Dec. 31, 2024		63,900,000
Beginning balance at Dec. 31, 2024	2,784.3	$ 6.4	1,854.9	1,231.6	(304.5)	(4.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	166.8			172.3		(5.5)
Other Comprehensive Income, Net of Tax	47.0				46.8	0.2
Cash Dividends and Dividend Equivalents to Shareholders	$ (41.0)			(41.0)
Repurchases of Common Stock (in shares)	(509,000)	(500,000)
Repurchases of Common Stock (Note 13)	$ (32.5)	$ (0.1)	(14.9)	(17.5)
Shares Issued Under Employee Stock Purchase Plan	1.9	$ 0.1	1.8
Equity-based Compensation Cost	19.9		19.9
Equity-based Awards, Net of Shares Exchanged (in shares)		200,000
Equity-based Awards, Net of Shares Exchanged	(2.4)		(2.4)
Other Changes in Non-Controlling Interest	1.5					1.5
Ending balance (in shares) at Jun. 30, 2025		63,600,000
Ending balance at Jun. 30, 2025	2,945.5	$ 6.4	1,859.3	1,345.4	(257.7)	(7.9)
Beginning balance (in shares) at Mar. 31, 2025		64,000,000.0
Beginning balance at Mar. 31, 2025	2,911.5	$ 6.4	1,863.6	1,308.9	(261.3)	(6.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	69.8			72.6		(2.8)
Other Comprehensive Income, Net of Tax	3.8				3.6	0.2
Cash Dividends and Dividend Equivalents to Shareholders	$ (20.8)			(20.8)
Repurchases of Common Stock (in shares)	(446,000)	(400,000)
Repurchases of Common Stock (Note 13)	$ (28.5)	$ (0.1)	(13.1)	(15.3)
Shares Issued Under Employee Stock Purchase Plan	1.1	$ 0.1	1.0
Equity-based Compensation Cost	7.7		7.7
Equity-based Awards, Net of Shares Exchanged	0.1		0.1
Other Changes in Non-Controlling Interest	0.8					0.8
Ending balance (in shares) at Jun. 30, 2025		63,600,000
Ending balance at Jun. 30, 2025	$ 2,945.5	$ 6.4	$ 1,859.3	$ 1,345.4	$ (257.7)	$ (7.9)