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DERIVATIVES (Gain (Loss) Recognized in Income) (Details) - Cost of Sales [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Designated as Hedging Instrument [Member] | Inventory Intermediation Agreement Obligation [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain or (Loss) Recognized in Income on Derivatives $ 8.4 $ 12.6 $ (25.4)
Designated as Hedging Instrument [Member] | Intermediates and Refined Products Inventory [Member] | Fair Value Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain or (Loss) Recognized in Income on Derivatives (8.4) (12.6) 25.4
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain or (Loss) Recognized in Income on Derivatives $ (83.4) $ 44.4 $ 36.5