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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES, Part 2 (Details) $ in Millions	3 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2020 USD ($) MMBbls Bcf	Dec. 31, 2019 USD ($) Bcf MMBbls
Derivative [Line Items]
Realized Loss on Settled Interest Rate Swaps Recorded in AOCI	$ 48.3	$ 152.5	$ 48.3
Notional Amount Of Cash Flow Hedge Instruments Settled	1,300.0	750.0	1,300.0
Cash posted - offsetting derivative net liability positions under master-netting arrangements			$ 13.9
Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Fixed price | Purchased/ Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | Bcf			1.7	0
Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Fixed price | Sold/ Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | Bcf			(40.9)	(59.0)
Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Basis | Purchased/ Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | Bcf			1.7	0
Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Basis | Sold/ Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | Bcf			(40.9)	(59.0)
Designated as Hedging Instrument [Member] | Futures, forwards and swaps | - Crude oil and NGLs (MMBbl) | Fixed price | Purchased/ Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMBbls			15.3	7.9
Designated as Hedging Instrument [Member] | Futures, forwards and swaps | - Crude oil and NGLs (MMBbl) | Fixed price | Sold/ Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMBbls			(22.7)	(17.4)
Designated as Hedging Instrument [Member] | Interest-rate contracts | Purchased/ Payor
Derivative [Line Items]
Derivative, Notional Amount			$ 1,100.0	$ 3,100.0
Designated as Hedging Instrument [Member] | Interest-rate contracts | Sold/ Receiver
Derivative [Line Items]
Derivative, Notional Amount			$ 0.0	$ 0.0
Not Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Fixed price | Purchased/ Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | Bcf			1.5	0
Not Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Fixed price | Sold/ Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | Bcf			(1.5)	0
Not Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Basis | Purchased/ Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | Bcf			1.5	0
Not Designated as Hedging Instrument [Member] | Futures and swaps | - Natural gas (Bcf) | Basis | Sold/ Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | Bcf			(1.5)	0
Not Designated as Hedging Instrument [Member] | Futures, forwards and swaps | - Crude oil and NGLs (MMBbl) | Fixed price | Purchased/ Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMBbls			0.2	0
Not Designated as Hedging Instrument [Member] | Futures, forwards and swaps | - Crude oil and NGLs (MMBbl) | Fixed price | Sold/ Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMBbls			(0.2)	0
LIBOR Based Interest Payments [Member] | Cash Flow Hedging [Member] | Forward contracts | Interest-rate contracts
Derivative [Line Items]
Derivative, Notional Amount				$ 1,300.0
Forecasted Debt Issuances [Member] | Cash Flow Hedging [Member] | Forward contracts | Interest-rate contracts
Derivative [Line Items]
Derivative, Notional Amount			$ 1,100.0	$ 1,800.0
Notes Payable from Public Offering Due 2025, 2030 and 2050 [Member]
Derivative [Line Items]
Senior notes, noncurrent		$ 1,750.0
Term Loan Agreement due 2021 [Member] | Parent Company
Derivative [Line Items]
Debt Instrument, Face Amount	$ 1,500.0		$ 1,500.0

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