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, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 7.5 $ 422.6 $ 119.3
Product Revenues [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net     120.6
Customer Supply Agreements [Member] | Product Revenues [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 78.1 425.8 163.3
Provisional Pricing Arrangements [Member] | Product Revenues [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (70.6) (3.2) (42.7)
Commodity Contract [Member] | Cost of goods sold and operating expenses [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 0.0 $ 0.0 $ (1.3)