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Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS (Narrative) (Details)

v3.19.1
DERIVATIVE INSTRUMENTS (Narrative) (Details)
gal in Millions, MMcf in Millions, $ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
gal
MMcf
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
gal
MMcf
Derivative [Line Items] Ìý Ìý Ìý
Derivative assets $ 107.4 Ìý $ 91.5
Derivative liability $ 10.5 Ìý $ 3.7
Natural Gas [Member] Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý
Investment Contract Volume | MMcf 4.0 Ìý 1.8
Diesel [Member] Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý
Investment Contract Volume | gal 7.5 Ìý 11.0
Customer Supply Agreement [Member] | Not Designated as Hedging Instrument [Member] | Revenue from Contract with Customer [Member] Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý
Amount of gain/(loss) recognized in income on derivative $ 17.1 $ 41.9 Ìý
Provisional Pricing Arrangements [Member] | Not Designated as Hedging Instrument [Member] | Revenue from Contract with Customer [Member] Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý
Amount of gain/(loss) recognized in income on derivative $ (11.6) $ 1.9 Ìý