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Other Events Narrative (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Apr. 16, 2024 USD ($) | Oct. 31, 2023 USD ($) | Jun. 30, 2024 USD ($) shares | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) shares | Jun. 30, 2023 USD ($) | Jun. 30, 2023 AUD ($)
Other Commercial Events [Line Items] |  |  |  |  |  |  |
Revenue from Collaborative Arrangement, Excluding Revenue from Contract with Customer |  |  |  |  |  |  | $ 30.0
Revenue related to excess port and rail capacity agreement |  |  |  |  |  | $ 19,200,000 |
Storm Damage Provision |  |  |  | $ 5,000,000 |  | 5,000,000 |
Common stock repurchase amount including commission fees |  |  |  |  | $ 80,500,000 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  | $ 569,600,000 |  | $ 569,600,000 |  |
Stock Repurchased During Period, Shares | shares |  |  | 0 |  | 3,200,000 |  |
Shoal Creek insurance recovery |  |  | $ (109,500,000) | 0 | $ (109,500,000) | 0 |
Storm damage provision for materials and supplies inventories |  |  |  | 4,000,000 |  | 4,000,000 |
Storm damage provision for buildings and equipment |  |  |  | 1,000,000 |  | 1,000,000 |
Provision for Other Losses |  |  |  | 28,700,000 |  | 28,700,000 |
Provision for other losses related to longwall development and other costs |  |  |  | 17,800,000 |  | 17,800,000 |
Provision for other losses for equipment |  |  |  | $ 10,900,000 |  | 10,900,000 |
Proceeds from Insurance Settlement, Investing Activities |  |  |  |  | 5,600,000 | $ 0 |
Fair Value of Assets Acquired |  |  |  |  | 153,400,000 |  |
Asset Acquisition, Consideration Transferred, Transaction Cost |  |  |  |  | 9,400,000 |  |
Asset Acquisition, Consideration Transferred, Excluding Transaction Cost |  |  |  |  | 134,400,000 |  |
Noncash or Part Noncash Acquisition, Value of Assets Acquired |  |  |  |  | 9,600,000 |  |
Loss Contingency, Receivable |  |  | 103,900,000 |  | 103,900,000 |  |
Wards Well coal deposit |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |
Contingent royalty | $ 200,000,000 |  |  |  |  |  |
Treasury Stock, Common |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |
Accrued excise taxes related to common stock repurchases |  |  | 4,000,000 |  | 4,000,000 |  |
North Antelope Rochelle Mine |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |
Storm Damage Provision |  |  | $ 1,900,000 |  | $ 3,700,000 |  |
Shoal Creek Mine |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |
Business interruption and property loss limits on insurance claim, amount |  | $ 125,000,000 |  |  |  |  |
Deductible amount |  | $ 50,000,000 |  |  |  |  |

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