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Equity Method Investments (Details) $ in Millions, $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Aug. 31, 2020 AUD ($) | Mar. 31, 2020 AUD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investments |  |  |  |  | $ 47.1 | $ 56.9
(Loss) income from Equity Method Investments | $ (9.1) | $ 3.5 |  |  |  |
Depreciation, depletion and amortization and asset retirement obligation expenses | 106.0 | 172.5 |  |  |  |
Net interest expense | 33.1 | 35.8 |  |  |  |
Cash receipts from Middlemount Coal Pty | 0.0 | 1.1 |  |  |  |
Middlemount Mine |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
(Loss) income from Equity Method Investments | (9.1) | 3.8 |  |  |  |
Cash receipts from Middlemount Coal Pty | $ 0.0 | $ 1.1 |  |  |  |
Intercompany loans |  |  |  | $ 70.0 |  |
Financing Receivable, Stated Interest Rate | 15.00% |  |  |  |  |
Intercompany loans, carrying value |  |  |  |  | $ 23.6 | $ 17.1
Scenario, Forecast | Middlemount Mine |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Intercompany loans |  |  | $ 50.0 |  |  |
Middlemount Mine |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  | 50.00% | 50.00% |

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