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Equity Method Investments - Textual (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |  |
Net income | $ 815.6 | $ 1,319.1 | $ 371.4
Changes in tax reserves | (0.8) | (1.5) | 1.9
Revenue from physical sale of coal | 4,946.7 | 4,981.9 | 3,318.3
Equity method investment, current assets | 2,019.7 | 2,372.5 |
Equity method investment, current liabilities | 979.0 | 918.7 |
Revolving Loans | 0.0 | 0.0 |
Equity method investment related to Middlemount |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Revenue from physical sale of coal | 219.0 | 441.0 | 265.0
Equity method investment, current assets | 48.2 | 75.2 |
Equity method investment ,noncurrent assets | 199.5 | 256.3 |
Equity method investment, current liabilities | 76.6 | 135.7 |
Equity method investment, noncurrent liabilities | 58.2 | 97.7 |
Equity method investment related to Middlemount |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Insurance recovery |  |  | 12.5
Equity method investment related to Middlemount |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Cash receipts from Middlemount | $ 0.0 | 168.4 | $ 43.5
Equity interest percentage of revolving loans limit | 50.00% |  |
Financing receivable, stated interest rate (in percent) | 10.00% |  |
Equity method investment related to Middlemount |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Valuation allowance | $ 33.0 |  |
Ownership percentage of equity method investment | 50.00% |  |
R3 Renewables |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | $ 8.0 | $ 10.9 |

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