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Pension and Post-Employment Benefits - Expected Benefit Payments (Detail) - United Kingdom Plan [Member]
$ in Millions
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 43.9
2021 36.9
2022 35.9
2023 36.1
2024 35.8
2025-2029 $ 172.0