Retirement Plans (Schedule Of Fair Value Of Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 346.2	$ 478.9
Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	12.8	16.0
Level 2
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	20.9	34.0	$ 10.0
Level 3 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Plan assets	20.9	34.0	$ 0.0
Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	312.5	428.9
Net Asset Value | Common Collective Trust Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	312.5	428.9
Cash and Cash Equivalents | Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4.3	5.3
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	1.5	1.9
Mutual Funds | Level 1 | International Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	3.1	3.9
Mutual Funds | Level 1 | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Plan assets	2.3	2.9
Mutual Funds | Level 1 | Other
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1.6	2.0
Mutual Funds | Level 1 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	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 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	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 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Plan assets	20.9	34.0
Estimate of Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	33.7	50.0
Estimate of Fair Value | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4.3	5.3
Estimate of Fair Value | Mutual Funds | US Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1.5	1.9
Estimate of Fair Value | Mutual Funds | International Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	3.1	3.9
Estimate of Fair Value | Mutual Funds | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Plan assets	2.3	2.9
Estimate of Fair Value | Mutual Funds | Other
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1.6	2.0
Estimate of Fair Value | Mutual Funds | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 20.9	$ 34.0