Retirement and Post Retirement Health Care Plans (Schedule Of Amounts Recognized in Balance Sheet of Defined Benefit Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019
Pension Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Accrued Compensation and Benefits	$ 4.1	$ 4.0
Pension and Other Post Retirement Benefits	64.1	75.4
Pension plan balance sheet total	68.2	79.4
Net Actuarial Gain	43.7	45.2
Prior Service Cost	0.9	1.1
Amounts Recognized in Accumulated Other Comprehensive Loss	44.6	46.3
Postretirement Health Coverage
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Accrued Compensation and Benefits	0.5	0.5
Pension and Other Post Retirement Benefits	5.4	5.4
Pension plan balance sheet total	5.9	5.9
Net Actuarial Gain	(3.2)	(4.1)
Prior Service Cost	(0.9)	(1.7)
Amounts Recognized in Accumulated Other Comprehensive Loss	$ (4.1)	$ (5.8)