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Retirement Plans, Postretirement and Postemployment Benefits - Schedule of Expected Benefit Payments (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Pension  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 43.5
2021 44.8
2022 46.2
2023 47.6
2024 50.9
Years 2025 - 2029 271.0
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2020 2.0
2021 1.4
2022 1.4
2023 1.3
2024 1.2
Years 2025 - 2029 $ 4.7