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Equity Method Investments - Textual (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 AUD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |
Cash receipts from Middlemount | $ (23,200,000) | $ (27,300,000) | $ (13,800,000) |
Net (loss) income | (1,873,800,000) | (185,100,000) | 663,800,000 |
Changes in tax reserves | (7,700,000) | 3,000,000.0 | 2,100,000 |
Revenues | 2,881,100,000 | 4,623,400,000 | 5,581,800,000 |
Equity method investment, current assets | 1,420,300,000 | 1,613,900,000 |  |
Equity method investment, current liabilities | $ 790,600,000 | 975,300,000 |  |
Performance Units |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Stock price measurement period | 3 years |  |  |
Return on invested capital period | 3 years |  |  |
Middlemount |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Cash receipts from Middlemount | $ 0 | 14,700,000 | 106,700,000 |
Equity interest percentage of revolving loans limit | 50.00% |  |  | 50.00%
Revolving loan limit |  |  |  | $ 160
Financing receivable, stated interest rate (in percent) | 10.00% |  |  |
Intercompany loans, carrying value | $ 46,200,000 | 17,500,000 |  |
Middlemount |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net (loss) income |  |  | 9,000,000 |
Changes in tax reserves |  |  | 17,000,000 |
Valuation allowance | 33,000,000 |  |  |
Revenues | 123,000,000 | 160,000,000 | $ 271,000,000 |
Equity method investment, current assets | 31,000,000.0 | 30,800,000 |  |
Equity method investment ,noncurrent assets | $ 301,800,000 | 209,700,000 |  |
Ownership percentage of equity method investment | 50.00% |  |  | 50.00%
Equity method investment, current liabilities | $ 273,800,000 | 225,800,000 |  |
Equity method investment, noncurrent liabilities | $ 83,500,000 | $ 40,100,000 |  |

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