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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES, Part 2 (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021 USD ($) Bcf MMBbls	Dec. 31, 2020 USD ($) MMBbls Bcf
Derivative [Line Items]
Cash posted - offsetting derivative net liability positions under master-netting arrangements | $	$ 54.4	$ 35.1
Derivatives designated as Hedging Instrument | Futures | - Natural gas (Bcf) | Fixed price | Net Purchasor, Sellor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | Bcf	(80.9)	(43.3)
Derivatives designated as Hedging Instrument | Futures | - Natural gas (Bcf) | Basis | Net Purchasor, Sellor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | Bcf	(80.9)	(43.3)
Derivatives designated as Hedging Instrument | Futures | - Crude oil and NGLs (MMBbl) | Fixed price | Net Purchasor, Sellor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMBbls	(10.9)	(4.6)
Derivatives designated as Hedging Instrument | Interest Rate Contracts | Net Purchasor, Sellor
Derivative [Line Items]
Derivative, Notional Amount | $	$ 1,100.0	$ 1,100.0
Derivatives not designated as hedging instruments | Futures | - Crude oil and NGLs (MMBbl) | Fixed price | Purchased/ Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMBbls	0.5	0.8
Derivatives not designated as hedging instruments | Futures | - Crude oil and NGLs (MMBbl) | Fixed price | Sold/ Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMBbls	(0.5)	(0.8)
Forecasted Debt Issuances [Member] | Cash Flow Hedging [Member] | Forward contracts | Interest Rate Contracts
Derivative [Line Items]
Derivative, Notional Amount | $	$ 1,100.0	$ 1,100.0

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- Definition

Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 815
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