Condensed Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Common Stock in Treasury	Accumulated Other Comprehensive Loss, Net of Taxes
Balance at beginning of period at Dec. 31, 2019	$ (196.2)	$ 23.2	$ 2,073.5	$ 1,998.5	$ (3,382.4)	$ (909.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of share-based incentive compensation	20.9		20.9
Stock issued for profit sharing contribution paid in stock	24.4		(11.7)		36.1
Repurchases of common stock	(20.0)				(20.0)
Recognition of pension items, net of taxes	3.9					3.9
Foreign currency translation adjustments	(77.5)					(77.5)
Unrealized gain (loss) on derivative instruments, net of taxes	(16.3)					(16.3)
Net earnings	360.7			360.7
Dividends on common stock	(75.4)			(75.4)
Balance at end of period at Sep. 30, 2020	24.5	23.2	2,082.7	2,283.8	(3,366.3)	(998.9)
Balance at beginning of period at Jun. 30, 2020	(70.1)	23.2	2,070.9	2,175.1	(3,346.3)	(993.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of share-based incentive compensation	11.8		11.8
Repurchases of common stock	(20.0)				(20.0)
Recognition of pension items, net of taxes	1.8					1.8
Foreign currency translation adjustments	9.6					9.6
Unrealized gain (loss) on derivative instruments, net of taxes	(17.3)					(17.3)
Net earnings	134.0			134.0
Dividends on common stock	(25.3)			(25.3)
Balance at end of period at Sep. 30, 2020	24.5	23.2	2,082.7	2,283.8	(3,366.3)	(998.9)
Balance at beginning of period at Dec. 31, 2020	172.5	23.2	2,093.0	2,400.7	(3,380.9)	(963.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of share-based incentive compensation	19.8		19.8
Stock issued for profit sharing contribution paid in stock	28.0		0.2		27.8
Repurchases of common stock	(327.9)				(327.9)
Recognition of pension items, net of taxes	3.2					3.2
Foreign currency translation adjustments	(33.4)					(33.4)
Unrealized gain (loss) on derivative instruments, net of taxes	26.1					26.1
Net earnings	325.9			325.9
Dividends on common stock	(86.5)			(86.5)
Balance at end of period at Sep. 30, 2021	127.7	23.2	2,113.0	2,640.1	(3,681.0)	(967.6)
Balance at beginning of period at Jun. 30, 2021	93.8	23.2	2,103.7	2,562.8	(3,651.1)	(944.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of share-based incentive compensation	9.3		9.3
Repurchases of common stock	(29.9)				(29.9)
Recognition of pension items, net of taxes	1.7					1.7
Foreign currency translation adjustments	(35.4)					(35.4)
Unrealized gain (loss) on derivative instruments, net of taxes	10.9					10.9
Net earnings	107.7			107.7
Dividends on common stock	(30.4)			(30.4)
Balance at end of period at Sep. 30, 2021	$ 127.7	$ 23.2	$ 2,113.0	$ 2,640.1	$ (3,681.0)	$ (967.6)