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Retirement Benefits - Estimated OPEB Future Benefit Payments (Details) $ in Millions | Dec. 31, 2022 USD ($)
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Retirement benefits other than pension |
Estimated Future Benefits Payments [Line Items] |
2023 | $ 29.6
2024 | 28.9
2025 | 28.2
2026 | 27.4
2027 | 26.8
2028 through 2032 | 123.5
UMWA Plans |
Estimated Future Benefits Payments [Line Items] |
2023 | 20.0
2024 | 19.9
2025 | 19.8
2026 | 19.6
2027 | 19.5
2028 through 2032 | 92.8
Black Lung and Other Plans |
Estimated Future Benefits Payments [Line Items] |
2023 | 9.6
2024 | 9.0
2025 | 8.4
2026 | 7.8
2027 | 7.3
2028 through 2032 | $ 30.7

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