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Commitments and Contingent Liabilities - Narrative (Details) - Settlement Agreement Between Murray And UMWA $ in Thousands | Mar. 04, 2024 USD ($) | Sep. 30, 2024 USD ($) | May 01, 2020 retiree
--- | --- | --- | ---
Loss Contingencies [Line Items] |  |  |
Loss contingency payable amount | $ 75,000 |  |
Payable period | 5 years |  |
Accrued amount |  | $ 75,000 |
Murray Energy Corporation |  |  |
Loss Contingencies [Line Items] |  |  |
Number of impacted retirees | retiree |  |  | 2,159

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