Condensed Consolidated Statements of Shareholders' Equity Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance, at Beginning of the Period at Dec. 31, 2018	$ 1,582.6	$ 76.9	$ 371.1	$ 2,135.7	$ (638.0)	$ (363.1)
Net Earnings (Loss)	(36.3)	0.0	0.0	(36.3)	0.0	0.0
Other Comprehensive Income	1.0	0.0	0.0	0.0	0.0	1.0
Dividends	(18.3)	0.0	0.0	(18.3)	0.0	0.0
Compensation Plans and Other	(2.1)	0.0	(11.2)	0.0	9.1	0.0
Balance, at End of Period at Mar. 30, 2019	1,526.9	76.9	359.9	2,081.1	(628.9)	(362.1)
Balance, at Beginning of the Period at Dec. 31, 2018	1,582.6	76.9	371.1	2,135.7	(638.0)	(363.1)
Net Earnings (Loss)	41.2
Other Comprehensive Income	16.6
Balance, at End of Period at Jun. 29, 2019	1,537.3	76.9	363.0	2,140.5	(696.6)	(346.5)
Balance, at Beginning of the Period at Mar. 30, 2019	1,526.9	76.9	359.9	2,081.1	(628.9)	(362.1)
Net Earnings (Loss)	77.5	0.0	0.0	77.5	0.0	0.0
Other Comprehensive Income	15.6	0.0	0.0	0.0	0.0	15.6
Dividends	(18.1)	0.0	0.0	(18.1)	0.0	0.0
Compensation Plans and Other	5.2	0.0	3.1	0.0	2.1	0.0
Common Stock Repurchases	(69.8)	0.0	0.0	0.0	(69.8)	0.0
Balance, at End of Period at Jun. 29, 2019	1,537.3	76.9	363.0	2,140.5	(696.6)	(346.5)
Balance, at Beginning of the Period at Dec. 31, 2019	1,300.9	76.9	369.2	1,931.3	(1,023.1)	(53.4)
Net Earnings (Loss)	69.0	0.0	0.0	69.0	0.0	0.0
Other Comprehensive Income	(7.9)	0.0	0.0	0.0	0.0	(7.9)
Dividends	(19.2)	0.0	0.0	(19.2)	0.0	0.0
Compensation Plans and Other	(5.0)	0.0	(10.4)	0.0	5.4	0.0
Common Stock Repurchases	(34.1)	0.0	0.0	0.0	(34.1)	0.0
Balance, at End of Period at Mar. 28, 2020	1,303.7	76.9	358.8	1,981.1	(1,051.8)	(61.3)
Balance, at Beginning of the Period at Dec. 31, 2019	1,300.9	76.9	369.2	1,931.3	(1,023.1)	(53.4)
Net Earnings (Loss)	139.7
Other Comprehensive Income	(7.2)
Balance, at End of Period at Jun. 27, 2020	1,364.4	76.9	366.5	2,032.8	(1,051.2)	(60.6)
Balance, at Beginning of the Period at Mar. 28, 2020	1,303.7	76.9	358.8	1,981.1	(1,051.8)	(61.3)
Net Earnings (Loss)	70.7	0.0	0.0	70.7	0.0	0.0
Other Comprehensive Income	0.7	0.0	0.0	0.0	0.0	0.7
Dividends	(19.0)	0.0	0.0	(19.0)	0.0	0.0
Compensation Plans and Other	8.3	0.0	7.7	0.0	0.6	0.0
Balance, at End of Period at Jun. 27, 2020	$ 1,364.4	$ 76.9	$ 366.5	$ 2,032.8	$ (1,051.2)	$ (60.6)