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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Jun. 29, 2013
Sep. 28, 2013
Sep. 29, 2012
Dec. 29, 2012
Income Tax Disclosure [Abstract]            
Effective tax rate 21.60% 24.50%   23.30% 27.40%  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate     35.00%      
Unrecognized tax benefits $ 4.5     $ 4.5   $ 5.7