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Benefit Plans (Schedule Of Fair Values Of Company's Pension Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	$ 27.5	$ 26.4	$ 23.1
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	27.4	26.3
Level 1 [Member] \| Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0.1	0.1
Level 1 [Member] \| International Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	14.8	15.9
Level 1 [Member] \| Index Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	3.1	2.5
Level 1 [Member] \| U.S. Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	1.5	1.4
Level 1 [Member] \| Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	7.9	6.4
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0.1	0.1
Level 2 [Member] \| Cash And Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	$ 0.1	$ 0.1

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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