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Annual report pursuant to Section 13 and 15(d)

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

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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Schedule Of Derivatives Not Designated As Hedging Instruments) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] Ìý Ìý Ìý
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 422.6 $ 119.3 $ 57.8
Customer Supply Agreements [Member] | Product Revenues [Member] Ìý Ìý Ìý
Derivative Instruments, Gain (Loss) [Line Items] Ìý Ìý Ìý
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 425.8 163.3 41.7
Provisional Pricing Arrangements [Member] | Product Revenues [Member] Ìý Ìý Ìý
Derivative Instruments, Gain (Loss) [Line Items] Ìý Ìý Ìý
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (3.2) (42.7) 14.2
Commodity Contract [Member] | Cost of goods sold and operating expenses [Member] Ìý Ìý Ìý
Derivative Instruments, Gain (Loss) [Line Items] Ìý Ìý Ìý
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 0.0 $ (1.3) $ 1.9