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Hedging Activities and Fair Value Measurements (Details) bbl in Millions, $ in Millions, ft³ in Billions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) TWh ft³ bbl | Dec. 31, 2020 USD ($) Contract | Dec. 31, 2019 USD ($)
Derivative [Line Items] |  |  |  |  |
Accumulated other comprehensive income | $ |  |  | $ 285.9 | $ (165.2) | $ 71.4
Mark-to-market loss in interest expense | $ |  |  | 0.0 | 0.0 | (94.9)
Proceeds from (payments for) the settlement of interest rate derivative instruments | $ |  |  | 75.2 | (33.3) | 0.0
Gain on the sale of swaption | $ |  |  |  |  | 23.1
Carrying amount of hedged asset | $ |  |  | 101.8 | 144.0 |
Derivatives in cash flow hedging relationships [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income | $ |  |  | $ (946.1) | $ 233.4 | 104.4
Derivatives in mark-to-market relationships [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Mark-to-market loss in interest expense | $ |  |  |  |  | $ (47.6)
Forward Starting Swaps [Member] | Derivatives in cash flow hedging relationships [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Life of associated future debt |  |  |  | 30 years |
Notional amount of settled derivative instruments | $ |  | $ 1,080.0 |  | $ 575.0 |
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) to Income | $ |  | 2.4 |  |  |
Cumulative gains on forward-starting swaps recognized in accumulated other comprehensive income | $ |  | 122.8 |  |  |
Proceeds from (payments for) the settlement of interest rate derivative instruments | $ |  | 75.2 |  | $ (33.3) |
Forward Starting Swaps A [Member] | Derivatives in cash flow hedging relationships [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Life of associated future debt |  |  | 30 years |  |
Accumulated other comprehensive income | $ |  | 99.0 |  |  |
Forward Starting Swaps B [Member] | Derivatives in cash flow hedging relationships [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Accumulated other comprehensive income | $ |  | $ 21.4 |  |  |
Forward Starting Swaps - September 2019 [Member] | Derivatives in cash flow hedging relationships [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of Derivatives Outstanding | Contract |  |  |  | 10 |
Notional Amount | $ |  |  |  | $ 1,000.0 |
Designated as Hedging Instrument [Member] | Natural gas processing: Forecasted natural gas purchases for plant thermal reduction (PTR) [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | ft³ | [1],[2] |  | 25.9 |  |
Designated as Hedging Instrument [Member] | Natural gas processing: Forecasted natural gas purchases for plant thermal reduction (PTR) [Member] | Derivatives in cash flow hedging relationships [Member] | Long-term [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | ft³ | [1],[2] |  | 1.2 |  |
Designated as Hedging Instrument [Member] | Natural gas processing: Forecasted sales of NGLs [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | [1],[2] |  | 0.7 |  |
Designated as Hedging Instrument [Member] | Octane enhancement: Forecasted sales of octane enhancement products [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | [1],[2] |  | 23.9 |  |
Designated as Hedging Instrument [Member] | Octane enhancement: Forecasted sales of octane enhancement products [Member] | Derivatives in cash flow hedging relationships [Member] | Long-term [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | [1],[2] |  | 1.2 |  |
Designated as Hedging Instrument [Member] | Natural gas marketing: Natural gas storage inventory management activities [Member] | Derivatives in fair value hedging relationships [Member] | Current [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | ft³ | [1],[2] |  | 3.0 |  |
Designated as Hedging Instrument [Member] | NGL marketing: Forecasted purchases of NGLs and related hydrocarbon products [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | [1],[2] |  | 134.0 |  |
Designated as Hedging Instrument [Member] | NGL marketing: Forecasted purchases of NGLs and related hydrocarbon products [Member] | Derivatives in cash flow hedging relationships [Member] | Long-term [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | [1],[2] |  | 0.6 |  |
Designated as Hedging Instrument [Member] | NGL marketing: Forecasted sales of NGLs and related hydrocarbon products [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | [1],[2] |  | 133.0 |  |
Designated as Hedging Instrument [Member] | NGL marketing: Forecasted sales of NGLs and related hydrocarbon products [Member] | Derivatives in cash flow hedging relationships [Member] | Long-term [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | [1],[2] |  | 2.1 |  |
Designated as Hedging Instrument [Member] | NGL marketing: NGLs inventory management activities [Member] | Derivatives in fair value hedging relationships [Member] | Current [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | [1],[2] |  | 1.2 |  |
Designated as Hedging Instrument [Member] | Refined products marketing: Forecasted sales of refined products [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | [1],[2] |  | 0.3 |  |
Designated as Hedging Instrument [Member] | Crude oil marketing: Forecasted purchases of crude oil [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | [1],[2] |  | 4.6 |  |
Designated as Hedging Instrument [Member] | Crude oil marketing: Forecasted sales of crude oil [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | [1],[2] |  | 7.4 |  |
Designated as Hedging Instrument [Member] | Petrochemical marketing: Forecasted purchases of petrochemical products [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | [1],[2] |  | 0.1 |  |
Designated as Hedging Instrument [Member] | Petrochemical marketing: Forecasted sales of petrochemical products [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | [1],[2] |  | 1.3 |  |
Designated as Hedging Instrument [Member] | Commercial energy: Forecasted purchases of power related to asset operations [Member] | Derivatives in cash flow hedging relationships [Member] | Current [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | TWh | [1],[2] |  | 2.2 |  |
Not Designated as Hedging Instrument [Member] | Natural gas risk management activities [Member] | Derivatives in mark-to-market relationships [Member] | Current [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | ft³ | [1],[2],[3] |  | 26.2 |  |
Not Designated as Hedging Instrument [Member] | Natural gas risk management activities [Member] | Derivatives in mark-to-market relationships [Member] | Long-term [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | ft³ | [1],[2],[3] |  | 1.0 |  |
Not Designated as Hedging Instrument [Member] | NGL risk management activities [Member] | Derivatives in mark-to-market relationships [Member] | Current [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | [1],[2],[3] |  | 52.7 |  |
Not Designated as Hedging Instrument [Member] | NGL risk management activities [Member] | Derivatives in mark-to-market relationships [Member] | Long-term [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | [1],[2],[3] |  | 6.6 |  |
Not Designated as Hedging Instrument [Member] | Refined products risk management activities [Member] | Derivatives in mark-to-market relationships [Member] | Current [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | [1],[2],[3] |  | 4.1 |  |
Not Designated as Hedging Instrument [Member] | Crude oil risk management activities [Member] | Derivatives in mark-to-market relationships [Member] | Current [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Volume | [1],[2],[3] |  | 21.4 |  |
[1] | The maximum term for derivatives designated as cash flow hedges, derivatives designated as fair value hedges and derivatives not designated as hedging instruments is December 2023, March 2022 and December 2023, respectively.
[2] | Volume for derivatives designated as hedging instruments reflects the total amount of volumes hedged whereas volume for derivatives not designated as hedging instruments reflects the absolute value of derivative notional volumes.
[3] | Reflects the use of derivative instruments to manage risks associated with our transportation, processing and storage assets.

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