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Other Events (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Oct. 25, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 AUD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Other Commercial Events [Line Items] |  |  |  |  |
Mine Reclamation and Closing Liability, Noncurrent |  | $ 4,100,000 |  |  |
Revenue related to excess port and rail capacity agreement |  | 19,200,000 |  |  |
Other Noncash Income |  | 9,600,000 |  | $ 0 | $ 0
Proceeds From Collaborative Arrangement Related to Port and Rail Capacity |  |  | $ 10.0 |  |
Collaborative Arrangement, Revenue Not from Contract with Customer |  | 30,000,000 |  |  |
Collaborative Arrangement Related to Port and Rail Capacity, Revenue Not from Contract with Customer |  | 6,700,000 |  |  |
Wards Well coal deposit |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |
Asset Acquisition, Price of Acquisition, Expected | $ 136,000,000 |  |  |  |
Contingent royalty | $ 200,000,000 |  |  |  |
Millennium Mine |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal |  | 26,100,000 |  |  |
Wilkie Creek Mine |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal |  | 24,600,000 |  |  |
North Antelope Rochelle Mine |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |
Storm Damage Provision |  | 12,200,000 |  |  |
North Antelope Rochelle Mine | Materials and supplies inventories |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |
Storm Damage Provision |  | 4,000,000 |  |  |
North Antelope Rochelle Mine | Buildings and equipment |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |
Provision for buildings and equipment |  | 1,000,000 |  |  |
North Antelope Rochelle Mine | Incremental repair costs |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |
Storm Damage Provision |  | 7,200,000 |  |  |
Shoal Creek |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |
Provision for loss related to fire |  | 28,700,000 |  |  |
Loss limits on insurance claim, amount |  | 125,000,000 |  |  |
Deductible |  | 50,000,000 |  |  |
Shoal Creek | Longwall and development and other costs |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |
Provision for loss related to fire |  | 17,800,000 |  |  |
Shoal Creek | Equipment deemed inoperable |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |
Provision for loss related to fire |  | $ 10,900,000 |  |  |

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