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DERIVATIVES (Gain (Loss) Recognized in Income) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of Revenue Cost of Revenue Cost of Revenue Cost of Revenue
Designated as Hedging Instrument | Derivatives included within inventory intermediation agreement obligations        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain or (Loss) Recognized in Income on Derivatives $ 0.0 $ (12.7) $ 0.0 $ (8.5)
Designated as Hedging Instrument | Intermediates and Refined Products Inventory | Fair Value Hedging        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain or (Loss) Recognized in Income on Derivatives 0.0 12.7 0.0 8.5
Not Designated as Hedging Instrument | Commodity contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain or (Loss) Recognized in Income on Derivatives $ 28.0 $ 23.3 $ 2.5 $ 38.1