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Defined Benefit Plans - Schedule of Expected Benefit Payments (Detail)
$ in Millions
Dec. 31, 2020
USD ($)
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 42.0
2022 43.1
2023 44.2
2024 45.3
2025 46.3
Years 2026-2030 238.7
Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 1.0
2022 0.9
2023 0.9
2024 1.0
2025 1.1
Years 2026-2030 $ 5.7