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Fair Value Measurements - Breakdown by Fair Value Hierarchy Category for Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value: |  |  |
Assets from commodity derivative contracts |  | $ 46.2 | $ 79.8
Liabilities from commodity derivative contracts |  | 67.6 | 90.8
Carrying Value [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value: |  |  |
Assets from commodity derivative contracts | [1] | 134.8 | 136.5
Liabilities from commodity derivative contracts | [1] | 186.0 | 142.6
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Cash and cash equivalents |  | 242.8 | 331.1
Carrying Value [Member] | TRC Revolver [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 555.0 | 435.0
Carrying Value [Member] | TRP Revolver [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 280.0 | 0.0
Carrying Value [Member] | Partnership's Securitization Facility [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 350.0 | 370.0
Carrying Value [Member] | Senior Unsecured Notes [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 6,585.4 | 7,028.5
Fair Value [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value: |  |  |
Assets from commodity derivative contracts | [1] | 134.8 | 136.5
Liabilities from commodity derivative contracts | [1] | 186.0 | 142.6
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Cash and cash equivalents |  | 242.8 | 331.1
Fair Value [Member] | Level 1 [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value: |  |  |
Assets from commodity derivative contracts | [1] | 0.0 | 0.0
Liabilities from commodity derivative contracts | [1] | 0.0 | 0.0
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Cash and cash equivalents |  | 0.0 | 0.0
Fair Value [Member] | Level 2 [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value: |  |  |
Assets from commodity derivative contracts | [1] | 134.8 | 136.2
Liabilities from commodity derivative contracts | [1] | 185.8 | 142.0
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Cash and cash equivalents |  | 0.0 | 0.0
Fair Value [Member] | Level 3 [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value: |  |  |
Assets from commodity derivative contracts | [1] | 0.0 | 0.3
Liabilities from commodity derivative contracts | [1] | 0.2 | 0.6
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Cash and cash equivalents |  | 0.0 | 0.0
Fair Value [Member] | TRC Revolver [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 555.0 | 435.0
Fair Value [Member] | TRC Revolver [Member] | Level 1 [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 0.0 | 0.0
Fair Value [Member] | TRC Revolver [Member] | Level 2 [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 555.0 | 435.0
Fair Value [Member] | TRC Revolver [Member] | Level 3 [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 0.0 | 0.0
Fair Value [Member] | TRP Revolver [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 280.0 | 0.0
Fair Value [Member] | TRP Revolver [Member] | Level 1 [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 0.0 | 0.0
Fair Value [Member] | TRP Revolver [Member] | Level 2 [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 280.0 | 0.0
Fair Value [Member] | TRP Revolver [Member] | Level 3 [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 0.0 | 0.0
Fair Value [Member] | Partnership's Securitization Facility [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 350.0 | 370.0
Fair Value [Member] | Partnership's Securitization Facility [Member] | Level 1 [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 0.0 | 0.0
Fair Value [Member] | Partnership's Securitization Facility [Member] | Level 2 [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 350.0 | 370.0
Fair Value [Member] | Partnership's Securitization Facility [Member] | Level 3 [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 0.0 | 0.0
Fair Value [Member] | Senior Unsecured Notes [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 7,036.8 | 7,376.9
Fair Value [Member] | Senior Unsecured Notes [Member] | Level 1 [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 0.0 | 0.0
Fair Value [Member] | Senior Unsecured Notes [Member] | Level 2 [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 7,036.8 | 7,376.9
Fair Value [Member] | Senior Unsecured Notes [Member] | Level 3 [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |  |
Long-term debt |  | 0.0 | 0.0
Targa Pipeline Partners LP [Member] | Carrying Value [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value: |  |  |
Additional cash paid in potential earn-out payment | [2] | 2.0 | 2.3
Targa Pipeline Partners LP [Member] | Fair Value [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value: |  |  |
Additional cash paid in potential earn-out payment | [2] | 2.0 | 2.3
Targa Pipeline Partners LP [Member] | Fair Value [Member] | Level 1 [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value: |  |  |
Additional cash paid in potential earn-out payment | [2] | 0.0 | 0.0
Targa Pipeline Partners LP [Member] | Fair Value [Member] | Level 2 [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value: |  |  |
Additional cash paid in potential earn-out payment | [2] | 0.0 | 0.0
Targa Pipeline Partners LP [Member] | Fair Value [Member] | Level 3 [Member] |  |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value: |  |  |
Additional cash paid in potential earn-out payment | [2] | $ 2.0 | $ 2.3
[1] | The fair value of derivative contracts in this table is presented on a different basis than the Consolidated Balance Sheets presentation as disclosed in Note 15 – Derivative Instruments and Hedging Activities. The above fair values reflect the total value of each derivative contract taken as a whole, whereas the Consolidated Balance Sheets presentation is based on the individual maturity dates of estimated future settlements. As such, an individual contract could have both an asset and liability position when segregated into its current and long-term portions for Consolidated Balance Sheets classification purposes.
[2] | We have a contingent consideration liability for TPL’s previous acquisition of a gas gathering system and related assets, which is carried at fair value

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