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Postretirement Plans - Summary of Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
Jan. 01, 2022
Jan. 02, 2021
Defined Benefit Plan Disclosure [Line Items]    
Retiree health care benefits $ (104.9) $ (127.1)
U.S. Postretirement Health Care Plans    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefits (2.7) (2.8)
Retiree health care benefits (31.1) (34.5)
Net asset (liability) $ (33.8) $ (37.3)