Consolidated Statements of Stockholders' Equity - USD ($)	Total	Common Stock Issued [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock, Common
Beginning balance at Dec. 31, 2020	$ (17,100,000)	$ 900,000	$ 1,113,200,000	$ 2,385,800,000	$ (97,200,000)	$ (3,419,800,000)
Beginning balance, Treasury shares at Dec. 31, 2020						48,800,000
Stockholders' Equity [Roll Forward]
Net income	464,000,000.0			464,000,000.0
Dividends	(130,500,000)			(130,500,000)
Foreign currency translation adjustments, net	(7,300,000)				(7,300,000)
Pension and postretirement liability changes, net of tax expense (benefit)	13,900,000				13,900,000
Stock-based compensation expense	24,300,000		24,300,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax	2,500,000				2,500,000
Treasury shares reissued for common stock, shares						(200,000)
Treasury shares reissued for common stock	3,300,000		3,800,000			$ 7,100,000
Treasury stock purchases, shares						1,900,000
Treasury stock purchases	(622,100,000)					$ (622,100,000)
Ending balance at Dec. 31, 2021	(269,000,000.0)	900,000	1,133,700,000	2,719,300,000	(88,100,000)	$ (4,034,800,000)
Ending balance, Treasury shares at Dec. 31, 2021						50,500,000
Stockholders' Equity [Roll Forward]
Net income	497,100,000			497,100,000
Dividends	(145,800,000)			(145,800,000)
Foreign currency translation adjustments, net	(10,200,000)				(10,200,000)
Pension and postretirement liability changes, net of tax expense (benefit)	22,600,000				22,600,000
Share of equity method investments other comprehensive income	700,000
Stock-based compensation expense	21,800,000		21,800,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax	(15,600,000)				(15,600,000)
Treasury shares reissued for common stock, shares						(100,000)
Treasury shares reissued for common stock	3,600,000		300,000			$ 3,900,000
Treasury stock purchases, shares						1,300,000
Treasury stock purchases	(308,300,000)					$ (308,300,000)
Ending balance at Dec. 31, 2022	$ (203,100,000)	900,000	1,155,200,000	3,070,600,000	(90,600,000)	$ (4,339,200,000)
Ending balance, Treasury shares at Dec. 31, 2022	51,700,260					51,700,000
Stockholders' Equity [Roll Forward]
Net income	$ 590,100,000			590,100,000
Dividends	(154,500,000)			(154,500,000)
Foreign currency translation adjustments, net	27,700,000				27,700,000
Pension and postretirement liability changes, net of tax expense (benefit)	2,000,000.0				2,000,000.0
Share of equity method investments other comprehensive income	1,100,000				1,100,000
Stock-based compensation expense	30,100,000		30,100,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax	2,900,000				2,900,000
Treasury shares reissued for common stock, shares						(200,000)
Treasury shares reissued for common stock	3,900,000		700,000			$ 4,600,000
Treasury stock purchases, shares						100,000
Treasury stock purchases	(14,900,000)					$ (14,900,000)
Ending balance at Dec. 31, 2023	$ 285,300,000	$ 900,000	$ 1,184,600,000	$ 3,506,200,000	$ (56,900,000)	$ (4,349,500,000)
Ending balance, Treasury shares at Dec. 31, 2023	51,588,103					51,600,000