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DERIVATIVES (Gain (Loss) Recognized in Income) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] 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 $ 4.2
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 (4.2)
Not Designated as Hedging Instrument | Commodity contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain or (Loss) Recognized in Income on Derivatives $ (25.5) $ 14.8