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Commitment and Contingencies (Leases) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 25, 2010
Dec. 26, 2009
Commitments and Contingencies Disclosure [Abstract]      
Operating leases rental expense $ 34.3 $ 29.6 $ 29.5
Approximate minimum rental commitments under non-cancelable operating leases [Abstract]      
2012 31.7    
2013 21.4    
2014 12.2    
2015 7.7    
2016 5.0    
After 2016 $ 5.1    
Operating lease term, minimum 2 years    
Operating lease term, maximum 3 years