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Other Events Narrative (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 25, 2024 | Apr. 16, 2024 | Oct. 31, 2023 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Jan. 15, 2025
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  | $ 469,600,000 |  | $ 469,600,000 |  |
Shoal Creek insurance recovery |  |  |  | $ 0 | $ (109,500,000) | 0 | $ (109,500,000) |
Proceeds from Insurance Settlement, Investing Activities |  |  |  |  |  | $ 0 | 5,600,000 |
Anglo American Acquisition |  |  |  |  |  |  |  |
Other Commercial Events [Line Items] |  |  |  |  |  |  |  |
Upfront cash payment for planned acquisition | $ 2,058,000,000.000 |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | 75,000,000 |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Range of Outcomes, Maximum, Amount | 1,004,000,000.000 |  |  |  |  |  |  |
Payments To Acquire Businesses, Maximum Total Consideration | 3,788,000,000 |  |  |  |  |  |  |
Fixed deferred cash payments for planned acquisition | $ 726,000,000 |  |  |  |  |  |  |
Future Maximum Payments to Acquire Additional Interest in Business Combination |  |  |  |  |  |  |  | $ 13,000,000
Additional Interest to be Acquired in Business Combination |  |  |  |  |  |  |  | 0.50%
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] |  |  |  |  |  |  |  |
Shoal Creek insurance recovery |  |  |  |  |  |  | $ (109,500,000) |
Business interruption and property loss limits on insurance claim, amount |  |  | $ 125,000,000 |  |  |  |  |
Deductible amount |  |  | $ 50,000,000 |  |  |  |  |

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