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Postretirement Plans - Summary of Expected Benefit Payments (Detail) - U.S. Postretirement Health Care Plans
$ in Millions
Dec. 28, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 3.7
2021 3.8
2022 3.8
2023 3.9
2024 4.0
2025-2029 $ 20.3