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Fair Value Measurements - Breakdown by Fair Value Hierarchy Category for Financial Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value: |  |
Assets from commodity derivative contracts | $ 17.8 | $ 46.2
Liabilities from commodity derivative contracts | 362.7 | 67.6
Carrying Value [Member] |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value: |  |
Assets from commodity derivative contracts | 83.3 | 134.8
Liabilities from commodity derivative contracts | 432.5 | 186.0
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |
Cash and cash equivalents | 209.0 | 242.8
Carrying Value [Member] | TRC Revolver [Member] |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |
Long-term debt | 0.0 | 555.0
Carrying Value [Member] | TRP Revolver [Member] |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |
Long-term debt | 170.0 | 280.0
Carrying Value [Member] | Partnership's Securitization Facility [Member] |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |
Long-term debt | 360.0 | 350.0
Carrying Value [Member] | Senior Unsecured Notes [Member] |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |
Long-term debt | 6,465.7 | 6,585.4
Fair Value [Member] |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value: |  |
Assets from commodity derivative contracts | 83.3 | 134.8
Liabilities from commodity derivative contracts | 432.5 | 186.0
Financial Instruments Recorded on Our Consolidated Balance Sheets at Carrying Value: |  |
Cash and cash equivalents | 209.0 | 242.8
Fair Value [Member] | Level 1 [Member] |  |
Financial Instruments Recorded on Our Consolidated Balance Sheets at Fair Value: |  |
Assets from commodity derivative contracts | 0.0 | 0.0
Liabilities from commodity derivative contracts | 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 | 83.3 | 134.8
Liabilities from commodity derivative contracts | 431.0 | 185.8
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 | 0.0 | 0.0
Liabilities from commodity derivative contracts | 1.5 | 0.2
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 | 0.0 | 555.0
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 | 0.0 | 555.0
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 | 170.0 | 280.0
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 | 170.0 | 280.0
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 | 360.0 | 350.0
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 | 360.0 | 350.0
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 | 6,933.3 | 7,036.8
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 | 6,933.3 | 7,036.8
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

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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