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
	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 2.0	$ 6.2	$ 7.3
Interest Cost	8.0	10.6	9.3
Expected Return on Plan Assets	(13.3)	(12.5)	(11.9)
Amortization of Net Actuarial Loss	1.9	2.2	3.5
Amortization of Prior Service Cost	0.3	0.3	0.2
Net Periodic Benefit Cost	(1.1)	6.8	8.4
Prior Service Cost	0.2	0.2	0.2
Net Actuarial Gain	1.5	1.7	2.7
Total Recognized in OCI	1.7	1.9	2.9
2021	17.3
2022	16.0
2023	16.4
2024	16.6
2025	17.0
2026-2029	81.5
Postretirement Health Coverage
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.0	0.0	0.1
Interest Cost	0.2	0.3	0.4
Amortization of Net Actuarial Loss	(0.6)	(0.4)	0.0
Amortization of Prior Service Cost	(0.9)	(0.1)	0.0
Curtailment Gain	0.0	(0.5)	0.0
Net Periodic Benefit Cost	(1.3)	(0.7)	0.5
Prior Service Cost	(0.7)	(0.1)	0.0
Net Actuarial Gain	(0.5)	(0.3)	0.0
Total Recognized in OCI	(1.2)	$ (0.4)	$ 0.0
2021	0.5
2022	0.4
2023	0.4
2024	0.4
2025	0.4
2026-2029	$ 1.6