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	124.3			124.3
Dividends	(39.4)			(39.4)
Foreign currency translation adjustments	(3.3)				(3.3)
Pension and post-retirement liability changes, net of tax	0.1				0.1
Stock-based compensation expense	6.6		6.6
Change in cash flow hedges, net of tax	2.2				2.2
Treasury shares reissued for common stock	1.1		(0.6)			$ 1.7
Treasury shares reissued for common stock (in shares)						(100,000)
Treasury stock purchases	(8.1)					$ (8.1)
Ending balance at Mar. 31, 2024	368.8	0.9	1,190.6	3,591.1	(57.9)	$ (4,355.9)
Ending balance (in shares) at Mar. 31, 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	$ 120.3			120.3
Dividends	(40.8)			(40.8)
Foreign currency translation adjustments	4.2				4.2
Pension and post-retirement liability changes, net of tax	0.2				0.2
Stock-based compensation expense	6.3		6.3
Change in cash flow hedges, net of tax	8.7				8.7
Treasury shares reissued for common stock	1.1		(0.6)			$ 1.7
Treasury shares reissued for common stock (in shares)						(100,000)
Treasury stock purchases (in shares)						200,000
Treasury stock purchases	(97.7)					$ (97.7)
Ending balance at Mar. 31, 2025	$ 852.5	$ 0.9	$ 1,219.0	$ 4,230.3	$ (80.6)	$ (4,517.1)
Ending balance (in shares) at Mar. 31, 2025	51,678,069					51,700,000