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Postretirement Plans - Summary of Change in Benefit Obligation (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year $ 1,279.4 $ 1,325.9  
Service cost 19.3 20.0  
Interest cost 56.5 53.2  
Plan participant contributions 1.0 1.1  
Benefits paid (63.2) (62.4)  
Actuarial gain 94.7 (40.8)  
Benefit obligation at end of year 1,361.4 1,279.4 $ 1,325.9
U.S. Postretirement Health Care Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year 55.6 62.0  
Service cost 0.1 0.1 0.1
Interest cost 2.2 2.2 2.5
Plan participant contributions 0.5 0.9  
Benefits paid (4.4) (5.4)  
Actuarial gain (0.8) (4.2)  
Benefit obligation at end of year $ 53.2 $ 55.6 $ 62.0