Postretirement Plans (Summary Of Target Allocation By Asset Category And Changes In Fair Value Of Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 846.1	$ 793.0	$ 716.2
Voluntary Employees Beneficiary Association Plan Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	13.5	13.9
Voluntary Employees Beneficiary Association Plan Assets [Member] | Quoted Prices For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	10.5	11.1
Voluntary Employees Beneficiary Association Plan Assets [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	3.0	2.8
Voluntary Employees Beneficiary Association Plan Assets [Member] | Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0.1	0.1
Voluntary Employees Beneficiary Association Plan Assets [Member] | Cash And Cash Equivalents [Member] | Quoted Prices For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0.1	0.1
Voluntary Employees Beneficiary Association Plan Assets [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	7.4	7.9
Voluntary Employees Beneficiary Association Plan Assets [Member] | Equity Securities [Member] | Quoted Prices For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	7.4	7.9
Voluntary Employees Beneficiary Association Plan Assets [Member] | Private Equity Partnerships Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	3.0	2.8
Voluntary Employees Beneficiary Association Plan Assets [Member] | Private Equity Partnerships Equity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	3.0	2.8
Voluntary Employees Beneficiary Association Plan Assets [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	2.1	2.1
Voluntary Employees Beneficiary Association Plan Assets [Member] | Debt Securities [Member] | Quoted Prices For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	2.1	2.1
Voluntary Employees Beneficiary Association Plan Assets [Member] | Real Estate And Other Real Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0.9	1.0
Voluntary Employees Beneficiary Association Plan Assets [Member] | Real Estate And Other Real Assets [Member] | Quoted Prices For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 0.9	$ 1.0