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Retirement Plans, Postretirement and Postemployment Benefits - Schedule of Expected Benefit Payments (Detail)
$ in Millions
Dec. 31, 2020
USD ($)
Pension  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 43.7
2022 52.1
2023 48.5
2024 52.4
2025 53.3
Years 2026 - 2030 288.4
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2021 1.3
2022 1.4
2023 1.3
2024 1.2
2025 1.1
Years 2026 - 2030 $ 4.4