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Equity Method Investments Narrative (Details) $ in Millions, $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 AUD ($) | Dec. 31, 2022 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |
Revolving Loans | $ 0.0 |  |  | $ 0.0
R3 Renewables |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | $ 5.5 | $ 10.9 |  |
Middlemount Mine |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Financing receivable, stated interest rate (in percent) | 10.00% |  |  |
Revolving loan limit |  |  | $ 50.0 |
Equity interest percentage of revolving loans limit | 50.00% |  | 50.00% |
Cash receipts from Middlemount Coal Pty Ltd and other related parties | $ 0.0 | $ 151.5 |  |

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