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Postretirement Benefit Plans - Estimated Future Benefit Payments (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 10.4
2021 9.3
2022 8.9
2023 8.5
2024 8.2
2025 - 2029 35.4
United States | Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 23.5 [1]
2021 23.1 [1]
2022 22.4 [1]
2023 21.6 [1]
2024 20.9 [1]
2025 - 2029 96.9 [1]
International Plan [Member] | Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2020 4.0
2021 3.8
2022 3.5
2023 3.7
2024 3.9
2025 - 2029 $ 19.1
[1]
(a)
Excludes any impact of a potential U.S. pension plan termination.