Condensed Consolidated Statements of Stockholders' Equity - 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, 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	(2.4)		(2.4)
Stock issued for profit sharing contribution paid in stock	28.0		0.2		27.8
Repurchases of common stock	(175.5)				(175.5)
Recognition of pension items, net of taxes	(0.2)					(0.2)
Foreign currency translation adjustments	(25.2)					(25.2)
Unrealized gain on derivative instruments, net of taxes	19.3					19.3
Net earnings	110.1			110.1
Dividends on common stock	(25.2)			(25.2)
Balance at end of period at Mar. 31, 2021	101.4	23.2	2,090.8	2,485.6	(3,528.6)	(969.6)
Balance at beginning of period at Dec. 31, 2021	248.7	23.2	2,123.4	2,790.7	(3,754.7)	(933.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of share-based incentive compensation	(7.3)	0.1	(7.4)
Stock issued for profit sharing contribution paid in stock	22.7		6.9		15.8
Repurchases of common stock	(200.1)				(200.1)
Recognition of pension items, net of taxes	0.8					0.8
Foreign currency translation adjustments	3.5					3.5
Unrealized gain on derivative instruments, net of taxes	3.5					3.5
Net earnings	149.2			149.2
Dividends on common stock	(30.6)			(30.6)
Balance at end of period at Mar. 31, 2022	$ 190.4	$ 23.3	$ 2,122.9	$ 2,909.3	$ (3,939.0)	$ (926.1)