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Postretirement Plans (Summary Of Change In Benefit Obligation) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Jan. 01, 2011
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year $ 1,169.7 $ 1,037.4  
Service cost 21.1 19.1 16.5
Interest cost 52.0 53.9 54.2
Plan participants' contributions 1.3 1.4  
Benefits paid (55.8) (53.5)  
Benefit obligation at end of year 1,229.3 1,169.7 1,037.4
U.S. Postretirement Health Care Plans [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year 72.8 81.3  
Service cost 0.2 0.2 0.2
Interest cost 2.6 3.3 3.9
Plan participants' contributions 1.4 1.9  
Benefits paid (6.8) (7.9)  
Actuarial (gain) loss (1.2) (6.0)  
Benefit obligation at end of year $ 69.0 $ 72.8 $ 81.3