Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock Issued [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock at Cost [Member]
Beginning balance at Dec. 31, 2019	$ (170.2)		$ 0.9	$ 1,093.5	$ 2,148.7		$ (103.8)	$ (3,309.5)
Beginning balance (Accounting Standards Update 2016-13) at Dec. 31, 2019		$ (1.3)				$ (1.3)
Beginning balance, Treasury shares at Dec. 31, 2019								48,600,000
Stockholders' Equity [Roll Forward]
Net income	356.3				356.3
Dividends	(117.9)				(117.9)
Foreign currency translation adjustments, net	0.8						0.8
Pension and postretirement liability changes, net of tax expense (benefit)	(1.2)						(1.2)
Share of equity method investments other comprehensive income	(1.2)						(1.2)
Stock-based compensation expense	24.3			24.3
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax	8.2						8.2
Treasury shares reissued for common stock, shares								(300,000)
Treasury shares reissued for common stock	3.0			4.6				$ 7.6
Treasury stock purchases, shares								500,000
Treasury stock purchases	(117.9)							$ (117.9)
Ending balance at Dec. 31, 2020	(17.1)		0.9	1,113.2	2,385.8		(97.2)	$ (3,419.8)
Ending balance, Treasury shares at Dec. 31, 2020								48,800,000
Stockholders' Equity [Roll Forward]
Net income	464.0				464.0
Dividends	(130.5)				(130.5)
Foreign currency translation adjustments, net	(7.3)						(7.3)
Pension and postretirement liability changes, net of tax expense (benefit)	13.9						13.9
Stock-based compensation expense	24.3			24.3
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax	2.5						2.5
Treasury shares reissued for common stock, shares								(200,000)
Treasury shares reissued for common stock	3.3			3.8				$ 7.1
Treasury stock purchases, shares								1,900,000
Treasury stock purchases	(622.1)							$ (622.1)
Ending balance at Dec. 31, 2021	$ (269.0)		0.9	1,133.7	2,719.3		(88.1)	$ (4,034.8)
Ending balance, Treasury shares at Dec. 31, 2021	50,536,125							50,500,000
Stockholders' Equity [Roll Forward]
Net income	$ 497.1				497.1
Dividends	(145.8)				(145.8)
Foreign currency translation adjustments, net	(10.2)						(10.2)
Pension and postretirement liability changes, net of tax expense (benefit)	22.6						22.6
Share of equity method investments other comprehensive income	0.7						0.7
Stock-based compensation expense	21.8			21.8
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax	(15.6)						(15.6)
Treasury shares reissued for common stock, shares								(100,000)
Treasury shares reissued for common stock	3.6			0.3				$ 3.9
Treasury stock purchases, shares								1,300,000
Treasury stock purchases	(308.3)							$ (308.3)
Ending balance at Dec. 31, 2022	$ (203.1)		$ 0.9	$ 1,155.2	$ 3,070.6		$ (90.6)	$ (4,339.2)
Ending balance, Treasury shares at Dec. 31, 2022	51,700,260							51,700,000