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Postretirement Plans - Summary of Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
Jan. 02, 2016
Jan. 03, 2015
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefits $ (4.5) $ (4.6)
Retiree health care benefits (37.9) (42.5)
Net liability (230.2) (222.5)
U.S. Postretirement Health Care Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefits (4.0) (4.8)
Retiree health care benefits (37.9) (42.5)
Net liability $ (41.9) $ (47.3)