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RISK MANAGEMENT AND HEDGING ACTIVITIES USING DERIVATIVES - Part 2 (Details) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) MMBbls Bcf	Dec. 31, 2019 USD ($) Bcf MMBbls	Dec. 31, 2018 USD ($)
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			$ 35.1
Derivatives designated as hedging instruments | Futures and swaps | Natural gas (Bcf) | Fixed price | Net Purchasor, Sellor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | Bcf			(43.3)	(59.0)
Derivatives designated as hedging instruments | Futures and swaps | Natural gas (Bcf) | Basis | Net Purchasor, Sellor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | Bcf			(43.3)	(59.0)
Derivatives designated as hedging instruments | Futures, forwards and swaps | Crude oils and NGLs (MMBbl) | Fixed price | Net Purchasor, Sellor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMBbls			(4.6)	(9.5)
Derivatives designated as hedging instruments | Interest Rate Contract | Net Purchasor, Sellor
Derivative [Line Items]
Derivative, Notional Amount			$ 1,100.0	$ 3,100.0
Derivatives not designated as hedging instruments | Futures, forwards and swaps | Crude oils and NGLs (MMBbl) | Fixed price | Purchased/Payor
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMBbls			0.8
Derivatives not designated as hedging instruments | Futures, forwards and swaps | Crude oils and NGLs (MMBbl) | Fixed price | Sold/Receiver
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume | MMBbls			(0.8)
Forecasted Debt Issuances [Member] | Cash Flow Hedging [Member] | Forward contracts | Interest Rate Contract
Derivative [Line Items]
Derivative, Notional Amount			$ 1,100.0	1,800.0
LIBOR Based Interest Payments [Member] | Cash Flow Hedging [Member] | Forward contracts | Interest Rate Contract
Derivative [Line Items]
Derivative, Notional Amount				$ 1,300.0
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 [Member]
Derivative [Line Items]
Debt Instrument, Face Amount	$ 1,500.0		$ 1,500.0		$ 1,500.0

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