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Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Schedule Of Derivative Instruments In Statement Of Financial Position, Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items] Ìý Ìý
Derivative asset, fair value $ 39.4 $ 33.1
Derivative liability, fair value 2.7 0.5
Not Designated as Hedging Instrument [Member] Ìý Ìý
Derivatives, Fair Value [Line Items] Ìý Ìý
Derivative asset, fair value 39.4 33.1
Derivative liability, fair value 2.4 0.5
Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Current Assets [Member] Ìý Ìý
Derivatives, Fair Value [Line Items] Ìý Ìý
Derivative liability, fair value 0.0 1.5
Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other Current Liabilities [Member] Ìý Ìý
Derivatives, Fair Value [Line Items] Ìý Ìý
Derivative liability, fair value 0.3 0.0
Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member] | Customer Supply Agreement [Member] | Other Current Assets [Member] Ìý Ìý
Derivatives, Fair Value [Line Items] Ìý Ìý
Derivative asset, fair value 37.9 21.3
Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member] | Other Current Assets [Member] Ìý Ìý
Derivatives, Fair Value [Line Items] Ìý Ìý
Derivative asset, fair value 1.5 10.3
Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member] | Other Current Liabilities [Member] Ìý Ìý
Derivatives, Fair Value [Line Items] Ìý Ìý
Derivative liability, fair value $ 2.4 $ 0.5