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Postretirement Plans - Summary of Change in Benefit Obligation (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year $ 1,229.3 $ 1,169.7  
Service cost 20.3 21.1 19.1
Interest cost 51.4 52.0 53.9
Plan participants' contributions 1.2 1.3  
Benefits paid (59.5) (55.8)  
Actuarial gain (88.9) 57.9  
Benefit obligation at end of year 1,152.3 1,229.3 1,169.7
U.S. Postretirement Health Care Plans [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year 69.0 72.8  
Service cost 0.1 0.2 0.2
Interest cost 2.2 2.6 3.3
Plan participants' contributions 1.2 1.4  
Benefits paid (6.8) (6.8)  
Actuarial gain (4.2) (1.2)  
Benefit obligation at end of year $ 61.5 $ 69.0 $ 72.8