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Equity Method Investments (Details) $ in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 AUD ($) | Dec. 31, 2019 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investments | $ 63.1 |  | $ 63.1 |  |  | $ 56.9
(Loss) income from Equity Method Investments | (6.0) | $ 9.7 | (15.1) | $ 13.2 |  |
Depreciation, depletion and amortization and asset retirement obligation expenses | 88.3 | 165.4 | 194.3 | 337.9 |  |
Net interest expense | 34.3 | 36.0 | 67.4 | 71.8 |  |
Cash receipts from Middlemount Coal Pty |  |  | 0.0 | 14.7 |  |
Middlemount Mine |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
(Loss) income from Equity Method Investments | (6.0) | $ 9.7 | (15.1) | 13.5 |  |
Cash receipts from Middlemount Coal Pty |  |  | $ 0.0 | $ 14.7 |  |
Intercompany loans |  |  |  |  | $ 120.0 |
Financing Receivable, Stated Interest Rate |  |  | 10.00% |  |  |
Intercompany loans, carrying value | $ 41.2 |  | $ 41.2 |  |  | $ 17.5
Middlemount Mine |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  | 50.00% |  | 50.00% |

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