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Discontinued Operations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 25, 2011
Jun. 30, 2012
Jun. 25, 2011
Dec. 31, 2011
Discontinued Operations and Disposal Groups [Abstract]          
Adjustments to indemnity liabilities due to changes in estimates, foreign exchange gains and losses, and accretion expense $ 2.3 $ (1.5) $ 2.4 $ (1.2)  
Disposal Group Including Discontinued Operation, Current, Legal Reserves 6.3   6.3   4.8
Discontinued Operation, Amount of Legal Reserves Adjustment to Prior Period Gain (Loss) on Disposal, Net of Tax $ (1.5)