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, 2021	$ (269.0)	$ 0.9	$ 1,133.7	$ 2,719.3	$ (88.1)	$ (4,034.8)
Beginning balance (in shares) at Dec. 31, 2021						50,500,000
Net income	402.7			402.7
Dividends	(108.1)			(108.1)
Foreign currency translation adjustments	(20.7)				(20.7)
Pension and post-retirement liability changes, net of tax	0.5				0.5
Share of equity method investments other comprehensive income	0.7				0.7
Stock-based compensation expense	16.4		16.4
Change in cash flow hedges, net of tax	(24.9)				(24.9)
Treasury shares reissued for common stock	2.7		0.3			$ 2.4
Treasury shares reissued for common stock (in shares)						(100,000)
Treasury stock purchases	(305.5)		0.0			$ (305.5)
Treasury stock purchases (in shares)						1,300,000
Ending balance at Sep. 30, 2022	(305.2)	0.9	1,150.4	3,013.9	(132.5)	$ (4,337.9)
Ending balance (in shares) at Sep. 30, 2022						51,700,000
Beginning balance at Jun. 30, 2022	(401.3)	0.9	1,144.0	2,909.5	(117.9)	$ (4,337.8)
Beginning balance (in shares) at Jun. 30, 2022						51,700,000
Net income	141.9			141.9
Dividends	(37.5)			(37.5)
Foreign currency translation adjustments	(11.6)				(11.6)
Pension and post-retirement liability changes, net of tax	0.5				0.5
Stock-based compensation expense	5.8		5.8
Change in cash flow hedges, net of tax	(3.5)				(3.5)
Treasury shares reissued for common stock	0.9		0.6			$ 0.3
Treasury stock purchases	(0.4)		0.0			$ (0.4)
Treasury stock purchases (in shares)						0
Ending balance at Sep. 30, 2022	(305.2)	0.9	1,150.4	3,013.9	(132.5)	$ (4,337.9)
Ending balance (in shares) at Sep. 30, 2022						51,700,000
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	51,700,260					51,700,000
Net income	$ 445.6			445.6
Dividends	(115.9)			(115.9)
Foreign currency translation adjustments	8.7				8.7
Pension and post-retirement liability changes, net of tax	0.2				0.2
Stock-based compensation expense	23.5		23.5
Change in cash flow hedges, net of tax	3.6				3.6
Treasury shares reissued for common stock	2.9		0.2			$ 2.7
Treasury shares reissued for common stock (in shares)						(100,000)
Treasury stock purchases	(7.1)					$ (7.1)
Ending balance at Sep. 30, 2023	$ 159.5	0.9	1,178.9	3,400.3	(77.0)	$ (4,343.6)
Ending balance (in shares) at Sep. 30, 2023	51,633,264					51,600,000
Share of equity method investments other comprehensive income	$ 1.1				1.1
Beginning balance at Jun. 30, 2023	62.6	0.9	1,169.3	3,309.0	(75.8)	$ (4,340.8)
Beginning balance (in shares) at Jun. 30, 2023						51,700,000
Net income	130.4			130.4
Dividends	(39.1)			(39.1)
Foreign currency translation adjustments	(5.7)				(5.7)
Pension and post-retirement liability changes, net of tax	0.3				0.3
Stock-based compensation expense	9.7		9.7
Change in cash flow hedges, net of tax	3.1				3.1
Treasury shares reissued for common stock	1.1		(0.1)			$ 1.2
Treasury shares reissued for common stock (in shares)						(100,000)
Treasury stock purchases	(4.0)					$ (4.0)
Ending balance at Sep. 30, 2023	$ 159.5	$ 0.9	$ 1,178.9	$ 3,400.3	(77.0)	$ (4,343.6)
Ending balance (in shares) at Sep. 30, 2023	51,633,264					51,600,000
Share of equity method investments other comprehensive income	$ 1.1				$ 1.1