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Equity Method Investments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 49.9   $ 58.5
Loss from equity affiliates 6.7 $ 3.7  
Middlemount Mine      
Schedule of Equity Method Investments [Line Items]      
Equity method investments 46.8   52.7
Loss from equity affiliates 6.3 0.4  
R3 Renewables      
Schedule of Equity Method Investments [Line Items]      
Equity method investments 0.0   0.0
Loss from equity affiliates 0.0 3.3  
R3 Renewables II      
Schedule of Equity Method Investments [Line Items]      
Equity method investments 3.1   $ 5.8
Loss from equity affiliates $ 0.4 $ 0.0