Retirement and Post Retirement Health Care Plans (Schedule Of Fair Value Of Plan Assets) (Details) - USD ($) $ in Millions	Jan. 01, 2022	Jan. 02, 2021	Dec. 28, 2019
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 478.9	$ 230.2
Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	16.0	11.2
Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	34.0	10.0
Level 3 | Real Estate Fund
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	10.0	$ 9.9
Level 3 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Plan assets	34.0	0.0
Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	428.9	209.0
Net Asset Value | Common Collective Trust Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	428.9	209.0
Cash and Cash Equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	5.3	1.3
Cash and Cash Equivalents | Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Cash and Cash Equivalents | Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Mutual Funds | Level 1 | US Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1.9	1.6
Mutual Funds | Level 1 | International Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	3.9	3.5
Mutual Funds | Level 1 | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Plan assets	2.9	3.0
Mutual Funds | Level 1 | Other
Defined Benefit Plan Disclosure [Line Items]
Plan assets	2.0	1.8
Mutual Funds | Level 1 | Real Estate Fund
Defined Benefit Plan Disclosure [Line Items]
Plan assets		0.0
Mutual Funds | Level 1 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0
Mutual Funds | Level 2 | US Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Mutual Funds | Level 2 | International Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Mutual Funds | Level 2 | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Mutual Funds | Level 2 | Other
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Mutual Funds | Level 2 | Real Estate Fund
Defined Benefit Plan Disclosure [Line Items]
Plan assets		0.0
Mutual Funds | Level 2 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0
Mutual Funds | Level 3 | US Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Mutual Funds | Level 3 | International Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Mutual Funds | Level 3 | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Mutual Funds | Level 3 | Other
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Mutual Funds | Level 3 | Real Estate Fund
Defined Benefit Plan Disclosure [Line Items]
Plan assets		10.0
Mutual Funds | Level 3 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Plan assets	34.0
Estimate of Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	50.0	21.2
Estimate of Fair Value | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets	5.3	1.3
Estimate of Fair Value | Mutual Funds | US Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1.9	1.6
Estimate of Fair Value | Mutual Funds | International Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	3.9	3.5
Estimate of Fair Value | Mutual Funds | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Plan assets	2.9	3.0
Estimate of Fair Value | Mutual Funds | Other
Defined Benefit Plan Disclosure [Line Items]
Plan assets	2.0	1.8
Estimate of Fair Value | Mutual Funds | Real Estate Fund
Defined Benefit Plan Disclosure [Line Items]
Plan assets		$ 10.0
Estimate of Fair Value | Mutual Funds | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 34.0