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Pensions Benefit Obligations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Apr. 02, 2011
Pension Plans, Defined Benefit [Member]
   
Change in Projected Benefit Obligation [Roll Forward]    
Service costs $ 3.1 $ 3.1
Interest costs 12.8 13.4
Other Postretirement Benefits [Member]
   
Change in Projected Benefit Obligation [Roll Forward]    
Service costs 0.2 0.2
Interest costs $ 0.5 $ 0.5