RETIREMENT AND POST RETIREMENT HEALTH CARE PLANS (Schedule Of Net Periodic Defined Benefit Pension Cost) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]
Service Cost	$ 0.4	$ 1.5	$ 1.5	$ 4.6
Interest Cost	2.1	2.8	6.2	8.2
Expected Return on Plan Assets	(3.3)	(3.2)	(9.9)	(9.4)
Amortization of Prior Service Cost and Net Actuarial Loss	0.1	0.5	0.4	1.6
Net Periodic Benefit Cost (Income)	$ (0.7)	$ 1.6	$ (1.8)	$ 5.0