ÐÇ¿Õ´«Ã½

Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS (Narrative) (Details)

v3.10.0.1
DERIVATIVE INSTRUMENTS (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
gal
MMcf
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
gal
MMcf
Sep. 30, 2017
USD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
gal
MMcf
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Derivative assets $ 190.8 Ìý $ 190.8 Ìý $ 49.5 $ 37.9
Derivative liability 5.8 Ìý 5.8 Ìý Ìý 2.0
Not Designated as Hedging Instrument [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Derivative assets 190.6 Ìý 190.6 Ìý Ìý 37.9
Derivative liability $ 5.7 Ìý $ 5.7 Ìý Ìý $ 1.7
Natural Gas [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Investment Contract Volume | MMcf 3,600,000.0 Ìý 3,600,000.0 Ìý Ìý 3,500,000.0
Diesel [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Investment Contract Volume | gal 1,400,000.0 Ìý 1,400,000.0 Ìý Ìý 0
Customer Supply Agreement [Member] | Not Designated as Hedging Instrument [Member] | Product Revenues [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Amount of gain/(loss) recognized in income on derivative $ 139.7 $ 54.3 $ 337.1 $ 123.9 Ìý Ìý
Customer Supply Agreement [Member] | Not Designated as Hedging Instrument [Member] | Derivative Financial Instruments, Assets [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Derivative assets 186.0 Ìý 186.0 Ìý Ìý $ 37.9
Provisional Pricing Arrangements [Member] | Not Designated as Hedging Instrument [Member] | Product Revenues [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Amount of gain/(loss) recognized in income on derivative (3.8) $ (15.7) (2.7) $ (21.0) Ìý Ìý
Provisional Pricing Arrangements [Member] | Not Designated as Hedging Instrument [Member] | Derivative Financial Instruments, Assets [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Derivative [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Derivative assets $ 4.6 Ìý $ 4.6 Ìý Ìý $ 0.0