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Postretirement Plans - Summary of Components of Net Periodic Benefit Costs and Other Amounts Recognized in Other Comprehensive Income (Loss) (Detail) - U.S. Postretirement Health Care Plans - USD ($)
$ in Millions
 12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Net periodic benefit cost:      
Service cost $ 0.0 $ 0.0 $ 0.1
Interest cost 1.8 2.1 2.2
Expected return on plan assets (0.8) (0.8) (0.9)
Amortization of unrecognized gain (0.4) (0.3) (0.1)
Net periodic benefit cost 0.6 1.0 1.3
Changes in benefit obligations recognized in OCI, net of tax:      
Net (gain) loss $ (1.4) $ 0.6 $ (0.3)