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Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS (Schedule Of Derivatives Not Designated As Hedging Instruments) (Details)

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DERIVATIVE INSTRUMENTS (Schedule Of Derivatives Not Designated As Hedging Instruments) (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] Ìý Ìý
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 5.5 $ 43.8
Customer Supply Agreement [Member] | Revenue from Contract with Customer [Member] Ìý Ìý
Derivative Instruments, Gain (Loss) [Line Items] Ìý Ìý
Amount of gain/(loss) recognized in income on derivative 17.1 41.9
Provisional Pricing Arrangements [Member] | Revenue from Contract with Customer [Member] Ìý Ìý
Derivative Instruments, Gain (Loss) [Line Items] Ìý Ìý
Amount of gain/(loss) recognized in income on derivative $ (11.6) $ 1.9