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Equity Method Investments - Textual (Details)
$ in Millions
 12 Months Ended 24 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
AUD ($)
Schedule of Equity Method Investments [Line Items]          
Cash receipts from Middlemount $ (1,500,000) $ (500,000) $ (23,200,000)    
Net income (loss) 1,319,100,000 371,400,000 (1,873,800,000)    
Changes in tax reserves (1,500,000) 1,900,000 (7,700,000)    
Valuation allowance 74,700,000        
Revenues 4,981,900,000 3,318,300,000 2,881,100,000    
Equity method investment, current assets 2,372,500,000 1,801,700,000   $ 2,372,500,000  
Equity method investment, current liabilities 918,700,000 931,700,000   918,700,000  
Revolving Loans   0   0  
Equity method investment related to Middlemount          
Schedule of Equity Method Investments [Line Items]          
Revenues 441,000,000 265,000,000 123,000,000    
Equity method investment, current assets 75,200,000 83,100,000   75,200,000  
Equity method investment ,noncurrent assets 256,300,000 269,900,000   256,300,000  
Equity method investment, current liabilities 135,700,000 254,900,000   135,700,000  
Equity method investment, noncurrent liabilities $ 97,700,000 79,500,000   $ 97,700,000  
Equity method investment related to Middlemount          
Schedule of Equity Method Investments [Line Items]          
Insurance recovery   12,500,000      
Performance Units          
Schedule of Equity Method Investments [Line Items]          
Stock price measurement period 3 years        
Return on invested capital period 3 years        
Equity method investment related to Middlemount          
Schedule of Equity Method Investments [Line Items]          
Cash receipts from Middlemount $ 168,400,000 $ 43,500,000 0    
Equity interest percentage of revolving loans limit 50.00%     50.00% 50.00%
Revolving loan limit         $ 50
Financing receivable, stated interest rate (in percent) 10.00%        
Equity method investment related to Middlemount          
Schedule of Equity Method Investments [Line Items]          
Valuation allowance $ 33,000,000   $ 33,000,000    
Ownership percentage of equity method investment 50.00%     50.00% 50.00%