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Equity Method Investments (Details) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 AUD ($) | Dec. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investments | $ 17,500,000 |  | $ 17,500,000 |  |  | $ 24,600,000
(Loss) income from equity method investments | $ (3,500,000) | $ (6,000,000.0) | (4,400,000) | $ (15,100,000) |  |
Cash receipts from Middlemount Coal Pty Ltd and other related parties |  |  | 2,600,000 | 0 |  |
Middlemount Mine |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Cash receipts from Middlemount Coal Pty Ltd and other related parties |  |  | $ (2,300,000) | 0 |  |
Equity interest percentage of revolving loans limit | 50.00% |  | 50.00% |  | 50.00% |
Revolving loan limit |  |  |  |  | $ 160,000,000 |
Financing receivable, stated interest rate (in percent) |  |  | 10.00% |  |  |
Intercompany loans, carrying value | $ 42,900,000 |  | $ 42,900,000 |  |  | $ 46,200,000
Middlemount Mine |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
(Loss) income from equity method investments | $ (3,500,000) | $ (6,000,000.0) | $ (4,400,000) | $ (15,100,000) |  |

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