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, 2022	$ (203.1)	$ 0.9	$ 1,155.2	$ 3,070.6	$ (90.6)	$ (4,339.2)
Beginning balance (in shares) at Dec. 31, 2022						51,700,000
Net income	98.0			98.0
Dividends	(37.7)			(37.7)
Foreign currency translation adjustments	6.8				6.8
Pension and post-retirement liability changes, net of tax	0.2				0.2
Stock-based compensation expense	6.1		6.1
Change in cash flow hedges, net of tax	5.0				5.0
Treasury shares reissued for common stock	0.8		(0.2)			$ 1.0
Treasury stock purchases	(2.0)		0.0			$ (2.0)
Treasury stock purchases (in shares)						0
Ending balance at Mar. 31, 2023	(125.9)	0.9	1,161.1	3,130.9	(78.6)	$ (4,340.2)
Ending balance (in shares) at Mar. 31, 2023						51,700,000
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	51,588,103					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	51,548,073					51,500,000