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Income Taxes Unrecognized Tax Benefits (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 24, 2012
Dec. 25, 2011
Income Taxes [Abstract]    
Unrecognized Tax Benefits, Period Increase (Decrease) $ (3.9)  
Unrecognized Tax Benefits 29.2 33.1
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 0.9  
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions 1.1  
Unrecognized Tax Benefits, Increases Resulting from Foreign Currency Translation $ 0.4