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, 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 (loss) 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)
Balance at beginning of period at Dec. 31, 2022	344.1	23.3	2,155.3	3,163.4	(4,019.1)	(978.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of share-based incentive compensation	(3.3)	0.1	(3.4)
Stock issued for profit sharing contribution paid in stock	23.9		0.9		23.0
Repurchases of common stock	(79.9)				(79.9)
Recognition of pension items, net of taxes	1.3					1.3
Foreign currency translation adjustments	36.6					36.6
Unrealized (loss) gain on derivative instruments, net of taxes	(8.3)					(8.3)
Net earnings	61.9			61.9
Dividends on common stock	(29.8)			(29.8)
Balance at end of period at Mar. 31, 2023	$ 346.5	$ 23.4	$ 2,152.8	$ 3,195.5	$ (4,076.0)	$ (949.2)