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Equity Method Investments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]          
Equity method investments $ 51.6   $ 51.6   $ 49.6
Loss (income) from equity affiliates 1.3 $ (2.3) 5.0 $ (4.1)  
Middlemount Mine          
Schedule of Equity Method Investments [Line Items]          
Equity method investments 43.0   43.0   42.5
Loss (income) from equity affiliates (2.3) (4.1) (1.9) (6.7)  
R3 Renewables          
Schedule of Equity Method Investments [Line Items]          
Equity method investments 8.6   8.6   $ 7.1
Loss (income) from equity affiliates $ 3.6 $ 1.8 $ 6.9 $ 2.6