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Postretirement Plans - Summary of Change in Benefit Obligation (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jan. 02, 2016
Jan. 03, 2015
Dec. 28, 2013
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year $ 1,325.9 $ 1,152.3  
Service cost 20.0 18.0 $ 20.3
Interest cost 53.2 57.3 51.4
Plan participant contributions 1.1 1.2  
Benefits paid (62.4) (59.2)  
Actuarial loss (gain) (40.8) 177.9  
Benefit obligation at end of year 1,279.4 1,325.9 1,152.3
U.S. Postretirement Health Care Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year 62.0 61.5  
Service cost 0.1 0.1 0.1
Interest cost 2.2 2.5 2.2
Plan participant contributions 0.9 1.2  
Benefits paid (5.4) (6.0)  
Actuarial loss (gain) (4.2) 2.7  
Benefit obligation at end of year $ 55.6 $ 62.0 $ 61.5