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RELATED PARTY TRANSACTIONS (Transactions with SBR) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Related Party Transaction [Line Items]        
Revenues   $ 38,288.5 $ 46,780.6 $ 27,202.0
Accounts receivable $ 1,336.1 1,336.1 1,451.7  
Accrued expenses 2,968.0 2,968.0 $ 3,691.0  
St. Bernard Renewables LLC        
Related Party Transaction [Line Items]        
Accounts receivable 22.1 22.1    
Accrued expenses 28.3 $ 28.3    
St. Bernard Renewables LLC | General and Administrative Expense | Operating Agreement        
Related Party Transaction [Line Items]        
Total expenses under affiliate agreements 62.8      
St. Bernard Renewables LLC | Equity Method Investment, Nonconsolidated Investee or Group of Investees        
Related Party Transaction [Line Items]        
Revenues 9.1      
Related Party Transaction, Purchases from Related Party $ 244.4