DERIVATIVE INSTRUMENTS (Schedule Of Derivatives Not Designated As Hedging Instruments) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Millions |
3 Months Ended | |
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Mar. 31, 2019 |
Mar. 31, 2018 |
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| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | $ 5.5 | $ 43.8 |
| Customer Supply Agreement [Member] | Revenue from Contract with Customer [Member] | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Amount of gain/(loss) recognized in income on derivative | 17.1 | 41.9 |
| Provisional Pricing Arrangements [Member] | Revenue from Contract with Customer [Member] | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Amount of gain/(loss) recognized in income on derivative | $ (11.6) | $ 1.9 |
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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