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	260.8			260.8
Dividends	(70.6)			(70.6)
Foreign currency translation adjustments	(9.1)				(9.1)
Pension and post-retirement liability changes, net of tax	0.0				0.0
Share of equity method investments other comprehensive income	0.7				0.7
Stock-based compensation expense	10.6		10.6
Change in cash flow hedges, net of tax	(21.4)				(21.4)
Treasury shares reissued for common stock	1.8		(0.3)			$ 2.1
Treasury shares reissued for common stock (in shares)						(100,000)
Treasury stock purchases	(305.1)		0.0			$ (305.1)
Treasury stock purchases (in shares)						1,300,000
Ending balance at Jun. 30, 2022	(401.3)	0.9	1,144.0	2,909.5	(117.9)	$ (4,337.8)
Ending balance (in shares) at Jun. 30, 2022						51,700,000
Beginning balance at Mar. 31, 2022	(410.2)	0.9	1,110.4	2,769.8	(80.5)	$ (4,210.8)
Beginning balance (in shares) at Mar. 31, 2022						51,100,000
Net income	177.2			177.2
Dividends	(37.5)			(37.5)
Foreign currency translation adjustments	(7.9)				(7.9)
Pension and post-retirement liability changes, net of tax	0.3				0.3
Share of equity method investments other comprehensive income	0.7				0.7
Stock-based compensation expense	5.9		5.9
Change in cash flow hedges, net of tax	(30.5)				(30.5)
Treasury shares reissued for common stock	0.9		0.7			$ 0.2
Treasury stock purchases	(100.2)		27.0			$ (127.2)
Treasury stock purchases (in shares)						600,000
Ending balance at Jun. 30, 2022	(401.3)	0.9	1,144.0	2,909.5	(117.9)	$ (4,337.8)
Ending balance (in shares) at Jun. 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	$ 315.2			315.2
Dividends	(76.8)			(76.8)
Foreign currency translation adjustments	14.3				14.3
Pension and post-retirement liability changes, net of tax	0.0				0.0
Stock-based compensation expense	13.8		13.8
Change in cash flow hedges, net of tax	0.5				0.5
Treasury shares reissued for common stock	1.9		0.3			$ 1.6
Treasury stock purchases	(3.2)					(3.2)
Ending balance at Jun. 30, 2023	$ 62.6	0.9	1,169.3	3,309.0	(75.8)	$ (4,340.8)
Ending balance (in shares) at Jun. 30, 2023	51,658,951					51,700,000
Beginning balance at Mar. 31, 2023	$ (125.9)	0.9	1,161.1	3,130.9	(78.6)	$ (4,340.2)
Beginning balance (in shares) at Mar. 31, 2023						51,700,000
Net income	217.2			217.2
Dividends	(39.1)			(39.1)
Foreign currency translation adjustments	7.5				7.5
Pension and post-retirement liability changes, net of tax	(0.3)				(0.3)
Stock-based compensation expense	7.7		7.7
Change in cash flow hedges, net of tax	(4.4)				(4.4)
Treasury shares reissued for common stock	1.1		0.5			$ 0.6
Treasury stock purchases	(1.2)					(1.2)
Ending balance at Jun. 30, 2023	$ 62.6	$ 0.9	$ 1,169.3	$ 3,309.0	$ (75.8)	$ (4,340.8)
Ending balance (in shares) at Jun. 30, 2023	51,658,951					51,700,000