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Defined Benefit Plans - Schedule of Expected Benefit Payments (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 41.2
2021 42.4
2022 43.5
2023 44.5
2024 45.8
Years 2025-2029 239.6
Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 0.4
2021 0.4
2022 0.3
2023 0.3
2024 0.3
Years 2025-2029 $ 2.1