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Equity Method Investments Narrative (Details)
$ in Millions, $ in Millions
9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
AUD ($)
Dec. 31, 2022
USD ($)
Schedule of Equity Method Investments [Line Items]        
Revolving Loans $ 0.0     $ 0.0
R3 Renewables        
Schedule of Equity Method Investments [Line Items]        
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures $ 5.5 $ 10.9    
Middlemount Mine        
Schedule of Equity Method Investments [Line Items]        
Financing receivable, stated interest rate (in percent) 10.00%      
Revolving loan limit     $ 50.0  
Equity interest percentage of revolving loans limit 50.00%   50.00%  
Cash receipts from Middlemount Coal Pty Ltd and other related parties $ 0.0 $ 151.5