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Postretirement Benefit Plans - Estimated Future Benefit Payments (Detail)
$ in Millions
Dec. 31, 2020
USD ($)
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 9.3
2022 8.8
2023 8.4
2024 8.1
2025 7.7
2026 - 2030 33.5
United States | Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 0.9
2022 0.9
2023 0.9
2024 0.9
2025 0.9
2026 - 2030 4.4
International Plan [Member] | Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2021 4.8
2022 3.8
2023 4.0
2024 4.2
2025 3.8
2026 - 2030 $ 20.3