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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) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items] Ìý Ìý Ìý Ìý
Revenues $ 555.6 $ 741.8 $ 1,455.8 $ 1,636.1
Not Designated as Hedging Instrument [Member] Ìý Ìý Ìý Ìý
Derivative Instruments, Gain (Loss) [Line Items] Ìý Ìý Ìý Ìý
Revenues (40.9) 135.9 43.4 334.4
Not Designated as Hedging Instrument [Member] | Customer Supply Agreement [Member] | Revenue from Contract with Customer Benchmark [Member] Ìý Ìý Ìý Ìý
Derivative Instruments, Gain (Loss) [Line Items] Ìý Ìý Ìý Ìý
Amount of gain/(loss) recognized in income on derivative 7.6 139.7 82.2 337.1
Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member] | Revenue from Contract with Customer Benchmark [Member] Ìý Ìý Ìý Ìý
Derivative Instruments, Gain (Loss) [Line Items] Ìý Ìý Ìý Ìý
Amount of gain/(loss) recognized in income on derivative $ (48.5) $ (3.8) $ (38.8) $ (2.7)