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Income Taxes Unrecognized Tax Benefits (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 23, 2012
Jun. 24, 2012
Sep. 23, 2012
Dec. 25, 2011
Income Taxes [Abstract]        
Income Tax Examination, Settlement Payment $ 0.9   $ 0.9  
Unrecognized Tax Benefits, Period Increase (Decrease)     (23.4)  
Unrecognized Tax Benefits 9.7   9.7 33.1
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities 21.7      
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations   6.3    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense     1.0  
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions     1.3  
Unrecognized Tax Benefits, Increases Resulting from Foreign Currency Translation     $ 2.3