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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 74.8 $ 154.7 $ 80.3 $ 198.5
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 57.5 155.5 74.6 197.4
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 $ 17.3 $ (0.8) $ 5.7 $ 1.1