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Postretirement Benefit Plans - Estimated Future Benefit Payments (Detail) $ in Millions | Dec. 31, 2019 USD ($)
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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.

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