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Postretirement Plans - Summary of Expected Benefit Payments (Detail)
$ in Millions
Dec. 30, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 73.6
2019 75.2
2020 78.9
2021 81.5
2022 91.4
2023-2027 462.3
U.S. Postretirement Health Care Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 4.1
2019 4.2
2020 4.3
2021 4.4
2022 4.5
2023-2027 $ 23.0