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Equity Method Investments - Schedule of Equity Method Investments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investments | $ 58.5 | $ 49.6 |
Income from equity affiliates | (11.5) | (6.9) | $ (131.2)
Equity method investment related to Middlemount |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Advances to investments | 0.0 | 0.0 | 168.4
Equity method investment related to Middlemount |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investments | 52.7 | 42.5 |
Income from equity affiliates | (14.9) | (14.8) | (135.1)
Equity method investment related to R3 II |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investments | 0.0 | 7.1 |
Income from equity affiliates | 3.3 | 7.9 | 3.9
Other Equity Method Investments Related to R3 II |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investments | 5.8 | 0.0 |
Income from equity affiliates | $ 0.1 | $ 0.0 | $ 0.0

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