Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Common Stock in Treasury	Accumulated Other Comprehensive Loss, Net of Taxes	Accumulated Other Comprehensive Loss, Net of Taxes Cumulative Effect, Period of Adoption, Adjustment
Beginning Balance at Dec. 31, 2017	$ 152.3	$ (3.4)	$ 23.0	$ 1,939.6	$ 1,735.2	$ 10.0	$ (2,700.6)	$ (844.9)	$ (13.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of share-based incentive compensation	21.4		0.2	29.2			(8.0)
Stock issued for profit sharing contribution paid in stock	24.6			0.8			23.8
Repurchases of common stock	(571.7)			80.0			(651.7)
Unrecognized pension items, net of taxes	(29.4)							(29.4)
Foreign currency translation adjustments, net of taxes	(50.4)							(50.4)
Unrealized gain (loss) on derivative instruments, net of taxes	17.7							17.7
Net earnings	193.1				193.1
Dividends on common stock	(102.8)				(102.8)
Ending Balance at Dec. 31, 2018	(348.6)		23.2	2,049.6	1,835.5		(3,336.5)	(920.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of share-based incentive compensation	23.4			23.4
Stock issued for profit sharing contribution paid in stock	21.9			0.5			21.4
Repurchases of common stock	(67.3)						(67.3)
Unrecognized pension items, net of taxes	(9.7)							(9.7)
Foreign currency translation adjustments, net of taxes	16.2							16.2
Unrealized gain (loss) on derivative instruments, net of taxes	4.9							4.9
Net earnings	263.0				263.0
Dividends on common stock	(100.0)				(100.0)
Ending Balance 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	31.2			31.2
Stock issued for profit sharing contribution paid in stock	24.4			(11.7)			36.1
Repurchases of common stock	(34.6)						(34.6)
Unrecognized pension items, net of taxes	(26.4)							(26.4)
Foreign currency translation adjustments, net of taxes	6.9							6.9
Unrealized gain (loss) on derivative instruments, net of taxes	(35.0)							(35.0)
Net earnings	502.9				502.9
Dividends on common stock	(100.7)				(100.7)
Ending Balance at Dec. 31, 2020	$ 172.5		$ 23.2	$ 2,093.0	$ 2,400.7		$ (3,380.9)	$ (963.5)