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Postretirement Plans - Summary of Expected Benefit Payments (Detail) - U.S. Postretirement Health Care Plans
$ in Millions
Jan. 02, 2021
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 3.6
2022 3.7
2023 3.7
2024 3.8
2025 3.8
2025-2029 $ 19.0