Consolidated Statements of Stockholders' Deficit - USD ($) $ in Millions	Total	Common Stock Issued	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock at Cost
Beginning balance at Dec. 31, 2023	$ 285.3	$ 0.9	$ 1,184.6	$ 3,506.2	$ (56.9)	$ (4,349.5)
Beginning balance (in shares) at Dec. 31, 2023						51,600,000
Net income	370.2			370.2
Dividends	(80.4)			(80.4)
Foreign currency translation adjustments	(9.5)				(9.5)
Pension and post-retirement liability changes, net of tax	(0.6)				(0.6)
Stock-based compensation expense	13.3		13.3
Change in cash flow hedges, net of tax	6.2				6.2
Treasury shares reissued for common stock	2.0		0.0			$ 2.0
Treasury shares reissued for common stock (in shares)						(100,000)
Treasury stock purchases	(9.1)					$ (9.1)
Ending balance at Jun. 30, 2024	577.4	0.9	1,197.9	3,796.0	(60.8)	$ (4,356.6)
Ending balance (in shares) at Jun. 30, 2024						51,500,000
Beginning balance at Mar. 31, 2024	368.8	0.9	1,190.6	3,591.1	(57.9)	$ (4,355.9)
Beginning balance (in shares) at Mar. 31, 2024						51,500,000
Net income	245.9			245.9
Dividends	(41.0)			(41.0)
Foreign currency translation adjustments	(6.2)				(6.2)
Pension and post-retirement liability changes, net of tax	(0.7)				(0.7)
Stock-based compensation expense	6.4		6.4
Change in cash flow hedges, net of tax	4.0				4.0
Treasury shares reissued for common stock	1.3		0.9			$ 0.4
Treasury shares reissued for common stock (in shares)						0
Treasury stock purchases	(1.1)					$ (1.1)
Ending balance at Jun. 30, 2024	577.4	0.9	1,197.9	3,796.0	(60.8)	$ (4,356.6)
Ending balance (in shares) at Jun. 30, 2024						51,500,000
Beginning balance at Dec. 31, 2024	$ 850.2	0.9	1,213.3	4,150.8	(93.7)	$ (4,421.1)
Beginning balance (in shares) at Dec. 31, 2024	51,573,986					51,600,000
Net income	$ 397.9			397.9
Dividends	(86.6)			(86.6)
Foreign currency translation adjustments	20.1				20.1
Stock-based compensation expense	14.5		14.5
Change in cash flow hedges, net of tax	12.2				12.2
Treasury shares reissued for common stock	2.6		0.5			$ 2.1
Treasury shares reissued for common stock (in shares)						(100,000)
Treasury stock purchases (in shares)						500,000
Treasury stock purchases	(310.4)					$ (310.4)
Ending balance at Jun. 30, 2025	$ 900.5	0.9	1,228.3	4,462.1	(61.4)	$ (4,729.4)
Ending balance (in shares) at Jun. 30, 2025	52,039,456					52,000,000.0
Beginning balance at Mar. 31, 2025	$ 852.5	0.9	1,219.0	4,230.3	(80.6)	$ (4,517.1)
Beginning balance (in shares) at Mar. 31, 2025						51,700,000
Net income	277.6			277.6
Dividends	(45.8)			(45.8)
Foreign currency translation adjustments	15.9				15.9
Pension and post-retirement liability changes, net of tax	(0.2)				(0.2)
Stock-based compensation expense	8.2		8.2
Change in cash flow hedges, net of tax	3.5				3.5
Treasury shares reissued for common stock	1.5		1.1			$ 0.4
Treasury shares reissued for common stock (in shares)						0
Treasury stock purchases (in shares)						300,000
Treasury stock purchases	(212.7)					$ (212.7)
Ending balance at Jun. 30, 2025	$ 900.5	$ 0.9	$ 1,228.3	$ 4,462.1	$ (61.4)	$ (4,729.4)
Ending balance (in shares) at Jun. 30, 2025	52,039,456					52,000,000.0