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Postretirement Plans - Summary of Components of Net Periodic Benefit Costs and Other Amounts Recognized in Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jan. 02, 2016
Jan. 03, 2015
Dec. 28, 2013
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 20.0 $ 18.0 $ 20.3
Interest cost 53.2 57.3 51.4
Expected return on plan assets (79.0) (73.3) (70.5)
Amortization of unrecognized loss 38.6 22.8 41.4
Net periodic benefit cost 31.9 24.0 41.9
Net loss (gain) 6.3 72.0 (85.0)
U.S. Postretirement Health Care Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.1 0.1 0.1
Interest cost 2.2 2.5 2.2
Expected return on plan assets (1.0) (1.1) (1.1)
Amortization of unrecognized loss 0.3    
Net periodic benefit cost 1.6 1.5 1.2
Net loss (gain) $ (2.1) $ 1.8 $ (3.4)