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Equity Method Investments (Details) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 AUD ($) | Dec. 31, 2021 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investments | $ 12,300,000 |  | $ 12,300,000 |  |  | $ 62,200,000
Income (Loss) from Equity Method Investments | $ 48,700,000 | $ (3,500,000) | 93,400,000 | $ (4,400,000) |  |
Cash receipts from Middlemount Coal Pty Ltd and other related parties |  |  | 143,900,000 | 2,600,000 |  |
Middlemount Mine |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Cash receipts from Middlemount Coal Pty Ltd and other related parties |  |  | $ (143,200,000) | (2,300,000) |  |
Equity interest percentage of revolving loans limit | 50.00% |  | 50.00% |  | 50.00% |
Revolving loan limit |  |  |  |  | $ 50,000,000 |
Financing receivable, stated interest rate (in percent) |  |  | 10.00% |  |  |
Middlemount Mine |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Income (Loss) from Equity Method Investments | $ 49,500,000 | $ (3,500,000) | $ 95,200,000 | $ (4,400,000) |  |

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