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DERIVATIVES (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Designated as Hedging Instrument [Member] | Inventory Intermediation Agreement Obligation [Member] | Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value Asset/(Liability) | $ 11.3 | $ (1.3)
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Accounts Receivable [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value Asset/(Liability) | $ (3.0) | $ 0.2

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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References 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=118260190&loc=d3e13433-108611 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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