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Equity Method Investments - Textual (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net income |  | $ 403.5 | $ 815.6 | $ 1,319.1
Changes in tax reserves |  | 0.5 | (0.8) | (1.5)
Revenue from physical sale of coal |  | 4,236.7 | 4,946.7 | 4,981.9
Equity method investment, current assets | $ 1,780.7 | 1,780.7 | 2,019.7 |
Equity method investment, current liabilities | $ 827.5 | 827.5 | 979.0 |
Shoal Creek insurance recovery |  | $ 109.5 | 0.0 | 0.0
Equity Ownership, Excluding Consolidated Entity and Equity Method Investee, Percentage | 25.00% | 25.00% |  |
Cash receipts from Middlemount Coal Pty Ltd and other investments |  | $ 0.4 | 2.6 | 171.8
Percentage Equity Ownership, Unrelated Party | 75.00% | 75.00% |  |
Equity method investment related to Middlemount |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Revenue from physical sale of coal |  | $ 229.0 | 219.0 | 441.0
Equity method investment, current assets | $ 62.9 | 62.9 | 48.2 |
Equity method investment, noncurrent assets | 224.1 | 224.1 | 199.5 |
Equity method investment, current liabilities | 146.2 | 146.2 | 76.6 |
Equity method investment, noncurrent liabilities | $ 25.8 | 25.8 | 58.2 |
Equity method investment related to Middlemount |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Cash receipts from Middlemount |  | $ 0.0 | 0.0 | 168.4
Equity method investment related to Middlemount |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Ownership percentage of equity method investment | 50.00% | 50.00% |  |
R3 Renewables LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Contributions to Equity Method Investments |  | $ 11.3 | $ 8.0 | $ 10.9
Cash receipts from Middlemount Coal Pty Ltd and other investments | $ 11.4 |  |  |

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