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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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