FAIR VALUE MEASUREMENTS (Narrative) (Details) - Not Designated as Hedging Instrument [Member] - Valuation, Market Approach [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Millions |
Mar. 31, 2020 |
Dec. 31, 2019 |
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| Customer Supply Agreement [Member] | Ìý | Ìý |
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | Ìý | Ìý |
| Derivative Asset | $ 19.0 | $ 44.5 |
| Provisional Pricing Arrangements [Member] | Ìý | Ìý |
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | Ìý | Ìý |
| Derivative Asset | 0.6 | 1.3 |
| Derivative liability | $ 0.0 | $ (1.1) |
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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. No definition available.
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