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Equity Method Investments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]      
Equity method investments $ 37.6   $ 34.1
Income (Loss) from Equity Method Investments (1.8) $ (44.7)  
Middlemount Mine      
Schedule of Equity Method Investments [Line Items]      
Equity method investments 29.4   27.1
Income (Loss) from Equity Method Investments 2.6 45.7  
R3 Renewables      
Schedule of Equity Method Investments [Line Items]      
Equity method investments 8.2   $ 7.0
Income (Loss) from Equity Method Investments $ (0.8) $ (1.0)