Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS (Schedule Of Derivative Instruments In Statement Of Financial Position, Fair Value) (Details)

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Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]      
Derivative assets $ 190.8 $ 49.5 $ 37.9
Derivative liability 5.8   2.0
Not Designated as Hedging Instrument [Member]      
Derivatives, Fair Value [Line Items]      
Derivative assets 190.6   37.9
Derivative liability 5.7   1.7
Not Designated as Hedging Instrument [Member] | Customer Supply Agreement [Member] | Derivative Financial Instruments, Assets [Member]      
Derivatives, Fair Value [Line Items]      
Derivative assets 186.0   37.9
Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member] | Derivative Financial Instruments, Assets [Member]      
Derivatives, Fair Value [Line Items]      
Derivative assets 4.6   0.0
Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member] | Other Current Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Derivative liability 5.7   1.7
Fair Value, Inputs, Level 3 [Member]      
Derivatives, Fair Value [Line Items]      
Derivative assets 190.6   37.9
Derivative liability 5.7   1.7
Fair Value, Inputs, Level 3 [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Derivative Financial Instruments, Assets [Member]      
Derivatives, Fair Value [Line Items]      
Derivative assets 0.2   0.0
Fair Value, Inputs, Level 3 [Member] | Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Current Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Derivative liability 0.1   0.3
Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member] | Customer Supply Agreement [Member] | Other Current Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Derivative liability $ 0.0   $ 0.0