Retirement Plans (Schedule Of Fair Value Of Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2022
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 367.7	$ 346.2
Level 1
Defined Benefit Plan Disclosure [Line Items]
Plan assets	21.8	12.8
Level 1 | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4.9	4.3
Level 1 | US Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1.8	1.5
Level 1 | International Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	9.5	3.1
Level 1 | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Plan assets	3.8	2.3
Level 1 | Other
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1.8	1.6
Level 1 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Plan assets	28.0	20.9
Level 3 | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Level 3 | US Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Level 3 | International Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Level 3 | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Plan assets	0.0	0.0
Level 3 | Other
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4.3	0.0
Level 3 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Plan assets	23.7	20.9	$ 34.0
Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	317.9	312.5
Net Asset Value | Common Collective Trust Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	317.9	312.5
Estimate of Fair Value
Defined Benefit Plan Disclosure [Line Items]
Plan assets	49.8	33.7
Estimate of Fair Value | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets	4.9	4.3
Estimate of Fair Value | US Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1.8	1.5
Estimate of Fair Value | International Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	9.5	3.1
Estimate of Fair Value | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Plan assets	3.8	2.3
Estimate of Fair Value | Other
Defined Benefit Plan Disclosure [Line Items]
Plan assets	6.1	1.6
Estimate of Fair Value | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 23.7	$ 20.9