DERIVATIVES (Fair Value of Derivative Instruments) (Details) - Accrued Expenses [Member] - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Designated as Hedging Instrument [Member] \| Inventory Intermediation Agreement Obligation [Member]
Derivatives, Fair Value [Line Items]
Fair Value Asset/(Liability)	$ (10.9)	$ 24.1
Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Fair Value Asset/(Liability)	$ 19.0	$ 7.2

Fair value of the assets less the liabilities of a derivative or group of derivatives.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

Name:	us-gaap_DerivativeFairValueOfDerivativeNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant