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DERIVATIVES (Gain (Loss) Recognized in Income) (Details) - Cost of Sales [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Designated as Hedging Instrument [Member] | Inventory Intermediation Agreement Obligation [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain or (Loss) Recognized in Income on Derivatives | $ 12.6 | $ (25.4) | $ 31.8
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 | (12.6) | 25.4 | (31.8)
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain or (Loss) Recognized in Income on Derivatives | $ 44.4 | $ 36.5 | $ (123.8)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + 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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