Benefit Plans (Schedule Of Pension Plan Weighted Average Asset Allocations By Asset Category) (Details)	Dec. 31, 2011	Jan. 01, 2011
U.K. Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Equity securities	58.30%	65.90%
Debt securities	41.70%	34.10%
U.S. Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Equity securities	66.90%	65.30%
Debt securities	33.10%	34.70%