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
	Dec. 30, 2017	Dec. 31, 2016
Pension Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Accrued Compensation and Employee Benefits	$ 2.9	$ 2.8
Pension and Other Post Retirement Benefits	89.8	93.8
Pension plan balance sheet total	92.7	96.6
Net Actuarial (Gain) Loss	51.3	54.5
Prior Service Cost	1.0	1.2
Amounts Recognized in Accumulated Other Comprehensive Loss	52.3	55.7
Postretirement Health Coverage
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Accrued Compensation and Employee Benefits	0.9	1.1
Pension and Other Post Retirement Benefits	11.2	12.7
Pension plan balance sheet total	12.1	13.8
Net Actuarial (Gain) Loss	$ (0.9)	$ 0.4