Retirement and Post Retirement Health Care Plans (Schedule of Net Periodic Benefit Costs and Benefit Payments Expected Future Service) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 6.2	$ 7.3	$ 7.2
Interest Cost	10.6	9.3	9.3
Expected Return on Plan Assets	(12.5)	(11.9)	(11.2)
Amortization of Net Actuarial (Gain) Loss	2.2	3.5	2.3
Amortization of Prior Service Cost	0.3	0.2	0.2
Net Periodic Benefit Cost	6.8	8.4	7.8
Prior Service Cost	0.2	0.2	0.1
Net Actuarial Gain	1.7	2.7	1.5
Total Recognized in OCI	1.9	2.9	1.6
2020	16.5
2021	16.1
2022	15.9
2023	16.7
2024	16.7
2025-2028	82.8
Postretirement Health Coverage
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.0	0.1	0.1
Interest Cost	0.3	0.4	0.4
Amortization of Net Actuarial (Gain) Loss	(0.4)	0.0	0.0
Amortization of Prior Service Cost	(0.1)	0.0	0.0
Curtailment Gain	(0.5)	0.0	0.0
Net Periodic Benefit Cost	(0.7)	0.5	0.5
Prior Service Cost	(0.1)	0.0	0.0
Net Actuarial Gain	(0.3)	0.0	0.0
Total Recognized in OCI	(0.4)	$ 0.0	$ 0.0
2020	0.5
2021	0.5
2022	0.5
2023	0.4
2024	0.4
2025-2028	$ 1.7