Quarterly report pursuant to Section 13 or 15(d)

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

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 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 135.9 $ 38.6 $ 334.4 $ 101.6
Customer Supply Agreement [Member] | Product Revenues [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain/(loss) recognized in income on derivative 139.7 54.3 337.1 123.9
Provisional Pricing Arrangements [Member] | Product Revenues [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain/(loss) recognized in income on derivative (3.8) (15.7) (2.7) (21.0)
Commodity Contract [Member] | Other Nonoperating Income (Expense) [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 0.0 $ 0.0 $ 0.0 $ (1.3)