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RELATED PARTY TRANSACTIONS (Summary of Related Party Transactions) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Transactions under commercial agreements:        
Sales $ 8,736.1 $ 9,157.6 $ 17,381.7 $ 18,452.6
St. Bernard Renewables LLC | Equity Method Investment, Nonconsolidated Investee or Group of Investees        
Transactions under commercial agreements:        
Sales 8.2 0.0 13.2 0.0
Purchases (73.3) 0.0 (164.5) 0.0
St. Bernard Renewables LLC | Equity Method Investment, Nonconsolidated Investee or Group of Investees | General and Administrative Expense | Operating Agreement        
Reimbursements under related party agreements:        
Transactions with related party 31.5 0.0 66.8 0.0
St. Bernard Renewables LLC | Equity Method Investment, Nonconsolidated Investee or Group of Investees | General and Administrative Expense | Omnibus Agreements        
Reimbursements under related party agreements:        
Transactions with related party 1.1 0.0 2.2 0.0
St. Bernard Renewables LLC | Equity Method Investment, Nonconsolidated Investee or Group of Investees | General and Administrative Expense | CAUSA        
Reimbursements under related party agreements:        
Transactions with related party 1.5 0.0 3.5 0.0
St. Bernard Renewables LLC | Equity Method Investment, Nonconsolidated Investee or Group of Investees | Cost of Sales | Lease Agreements        
Reimbursements under related party agreements:        
Transactions with related party $ (1.7) $ 0.0 $ (1.7) $ 0.0