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Other Events Narrative (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Apr. 16, 2024 | Oct. 31, 2023 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Other Commercial Events [Line Items] |  |  |  |  |  |
Shoal Creek insurance recovery |  |  | $ 0 | $ 0 | $ 0 | $ 109,500,000
Proceeds from Insurance Settlement, Investing Activities |  |  |  |  | 0 | 10,900,000
Loss Contingency, Receivable |  |  |  | $ 5,700,000 |  | 5,700,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  | $ 469,600,000 |  | $ 469,600,000 |
Wards Well coal deposit |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |
Fair Value of Assets Acquired | $ 153,400,000 |  |  |  |  |
Asset Acquisition, Consideration Transferred, Excluding Transaction Cost | 134,400,000 |  |  |  |  |
Asset Acquisition, Consideration Transferred, Transaction Cost | 9,400,000 |  |  |  |  |
Noncash or Part Noncash Acquisition, Value of Assets Acquired | 9,600,000 |  |  |  |  |
Contingent royalty | $ 200,000,000 |  |  |  |  |
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 |  |  |  |
Shoal Creek insurance recovery |  |  |  |  |  | $ 103,800,000

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