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Benefit Plans (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Jan. 01, 2011
Jan. 02, 2010
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligations $ 39.3 $ 34.5  
Weighted average return of both plans 1.40%    
Expected contribution to pension plans during 2012 2.0    
Total expenses with respect to plans $ 6.4 $ 3.9 $ 4.1
U.K. Plan [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Plan assets, target allocation percentage in equity securities 65.00%    
Plan assets, target allocation percentage in debt securities 35.00%    
U.S. Plan [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Plan assets, target allocation percentage in equity securities 50.00%    
Plan assets, target allocation percentage in debt securities 50.00%