XML 123 R105.htm IDEA: XBRL DOCUMENT v3.8.0.1
Postretirement Plans - Summary of Change in Benefit Obligation (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year $ 1,361.4 $ 1,279.4  
Service cost 22.7 19.3  
Interest cost 56.1 56.5  
Plan participant contributions 0.6 1.0  
Benefits paid (66.6) (63.2)  
Actuarial loss (gain) 69.5 94.7  
Benefit obligation at end of year 1,467.6 1,361.4 $ 1,279.4
U.S. Postretirement Health Care Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligation at beginning of year 53.2 55.6  
Service cost   0.1 0.1
Interest cost 2.1 2.2 2.2
Plan participant contributions 0.4 0.5  
Benefits paid (4.3) (4.4)  
Actuarial loss (gain) 1.1 (0.8)  
Benefit obligation at end of year $ 52.5 $ 53.2 $ 55.6