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Retirement Benefits (Summary Of Basis Used To Measure Defined Benefit Plans' Assets At Fair Value) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 76,141 $ 75,547
Equity [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 14,968 13,644
U.S. Absolute Return Funds [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 38,449 [1] 38,325 [1]
Non U.S. Absolute Return Funds [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 21,709 [1] 22,838 [1]
Other [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 1,015 [2] 740 [2]
Fair Value, Inputs, Level 1 [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 70,952 50,333
Fair Value, Inputs, Level 1 [Member] | Equity [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 14,968 13,644
Fair Value, Inputs, Level 1 [Member] | U.S. Absolute Return Funds [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 38,449 [1] 18,549 [1]
Fair Value, Inputs, Level 1 [Member] | Non U.S. Absolute Return Funds [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 16,520 [1] 17,400 [1]
Fair Value, Inputs, Level 1 [Member] | Other [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 1,015 [2] 740 [2]
Fair Value, Inputs, Level 2 [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 5,189 25,214
Fair Value, Inputs, Level 2 [Member] | U.S. Absolute Return Funds [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets   19,776 [1]
Fair Value, Inputs, Level 2 [Member] | Non U.S. Absolute Return Funds [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 5,189 [1] 5,438 [1]
Fair Value, Inputs, Level 3 [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets      
Fair Value, Inputs, Level 3 [Member] | Equity [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets      
Fair Value, Inputs, Level 3 [Member] | U.S. Absolute Return Funds [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets    [1]    [1]
Fair Value, Inputs, Level 3 [Member] | Non U.S. Absolute Return Funds [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets    [1]    [1]
Fair Value, Inputs, Level 3 [Member] | Other [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets    [2]    [2]
[1] Primarily funds invested by managers that have a global mandate with the flexibility to allocate capital broadly across a wide range of asset classes and strategies including, but not limited to equities, fixed income, commodities, interest rate futures, currencies and other securities to outperform an agreed benchmark with specific return and volatility targets.
[2] Primarily cash and cash equivalents.