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Postretirement Plans - Summary of Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Jan. 02, 2016
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefits $ (4.7) $ (4.5)
Retiree health care benefits (36.7) (37.9)
Net liability (250.6) (230.2)
U.S. Postretirement Health Care Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefits (3.3) (4.0)
Retiree health care benefits (36.7) (37.9)
Net liability $ (40.0) $ (41.9)