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Postretirement Benefit Plans - Estimated Future Benefit Payments (Detail) $ in Millions | Dec. 31, 2020 USD ($)
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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

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