DERIVATIVES (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Designated as Hedging Instrument [Member] | Inventory Intermediation Agreement Obligation [Member] | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Fair Value Asset/(Liability)	$ 24.4	$ (1.3)
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Fair Value Asset/(Liability)	$ (6.0)
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Accounts Receivable
Derivatives, Fair Value [Line Items]
Fair Value Asset/(Liability)		$ 0.2