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Postretirement Plans (Summary Of Amounts Recognized In Consolidated Balance Sheets) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 29, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefits $ 4.6 $ 6.0
Retiree health care benefits 48.4 52.8
Net liability (265.3) (323.6)
U.S. Postretirement Health Care Plans [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefits (5.5) (6.5)
Retiree health care benefits (48.4) (52.8)
Net liability $ (53.9) $ (59.3)