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Other Events (Details) $ in Millions, $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 16, 2024 USD ($) | Oct. 31, 2023 USD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 AUD ($)
Other Commercial Events [Line Items] |  |  |  |  |  |
Shoal Creek insurance recovery |  |  | $ 0.0 | $ 109.5 | $ 0.0 |
Revenue related to excess port and rail capacity agreement |  |  |  |  | 19.2 |
Other Noncash Income |  |  | 0.0 | 0.3 | 9.6 |
Proceeds From Collaborative Arrangement Related to Port and Rail Capacity |  |  |  |  |  | $ 10.0
Collaborative Arrangement, Revenue Not from Contract with Customer |  |  |  |  |  | $ 30.0
Collaborative Arrangement Related to Port and Rail Capacity, Revenue Not from Contract with Customer |  |  |  |  | 6.7 |
Insurance proceeds attributable to Shoal Creek equipment losses |  |  | $ 0.0 | 10.9 | 0.0 |
Wards Well coal deposit |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |
Contingent royalty | $ 200.0 |  |  |  |  |
Fair Value of Assets Acquired | 153.4 |  |  |  |  |
Asset Acquisition, Consideration Transferred, Transaction Cost | 9.4 |  |  |  |  |
Asset Acquisition, Consideration Transferred, Excluding Transaction Cost | 134.4 |  |  |  |  |
Noncash or Part Noncash Acquisition, Value of Assets Acquired | $ 9.6 |  |  |  |  |
North Antelope Rochelle Mine |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |
Storm Damage Provision |  |  |  |  | 12.2 |
North Antelope Rochelle Mine | Materials and supplies inventories |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |
Storm Damage Provision |  |  |  |  | 4.0 |
North Antelope Rochelle Mine | Buildings and equipment |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |
Provision for buildings and equipment |  |  |  |  | 1.0 |
North Antelope Rochelle Mine | Incremental repair costs |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |
Storm Damage Provision |  |  |  | 3.7 | 7.2 |
Shoal Creek |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |
Shoal Creek insurance recovery |  |  |  | 109.5 |  |
Provision for loss related to fire |  |  |  |  | 28.7 |
Loss limits on insurance claim, amount |  | $ 125.0 |  |  |  |
Deductible |  | $ 50.0 |  |  |  |
Shoal Creek | Longwall and development and other costs |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |
Provision for loss related to fire |  |  |  |  | 17.8 |
Shoal Creek | Equipment deemed inoperable |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |
Provision for loss related to fire |  |  |  | $ 10.9 | $ 10.9 |

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