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Debt Obligations - Summary Of Debt Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Current Obligations of the Partnership [Abstract] |  |  |
Accounts receivable securitization facility, due April 2021 | [1],[2] | $ 350.0 | $ 370.0
Current debt | [1] | 356.5 | 370.0
Debt issuance costs, net of amortization |  | 0.0 | 0.0
Finance lease liabilities |  | 12.1 | 12.2
Current debt obligations |  | 368.6 | 382.2
Long-term [Abstract] |  |  |
Long-term debt including Unamortized premium(discount) and Debt issuance costs |  | 7,413.9 | 7,463.5
Debt issuance costs, net of amortization |  | (45.5) | (49.1)
Finance lease liabilities |  | 18.7 | 25.8
Long-term debt |  | 7,387.1 | 7,440.2
Total debt obligations |  | 7,755.7 | 7,822.4
Letters of credit outstanding |  | 44.4 | 88.2
TRP Senior Secured Revolving Credit Facility due June 2023 [Member] | Targa Resources Partners LP [Member] |  |  |
Long-term [Abstract] |  |  |
Long-term debt | [1],[3] | 280.0 | 0.0
Targa Pipeline Partners LP [Member] |  |  |
Current Obligations of the Partnership [Abstract] |  |  |
Long-term debt, current | [1],[4] | 6.5 | 0.0
Senior Unsecured Notes [Member] | Senior Unsecured 5¼% Notes due May 2023 [Member] | Targa Resources Partners LP [Member] |  |  |
Long-term [Abstract] |  |  |
Long-term debt | [1] | 0.0 | 559.6
Senior Unsecured Notes [Member] | Senior Unsecured 4¼% Notes due November 2023 [Member] | Targa Resources Partners LP [Member] |  |  |
Long-term [Abstract] |  |  |
Long-term debt | [1] | 583.9 | 583.9
Senior Unsecured Notes [Member] | Senior Unsecured 6¾% Notes due March 2024 [Member] | Targa Resources Partners LP [Member] |  |  |
Long-term [Abstract] |  |  |
Long-term debt | [1] | 0.0 | 580.1
Senior Unsecured Notes [Member] | Senior Unsecured 5⅛% Notes due February 2025 [Member] | Targa Resources Partners LP [Member] |  |  |
Long-term [Abstract] |  |  |
Long-term debt | [1] | 481.0 | 500.0
Senior Unsecured Notes [Member] | Senior Unsecured 5⅞% Notes due April 2026 [Member] | Targa Resources Partners LP [Member] |  |  |
Long-term [Abstract] |  |  |
Long-term debt | [1] | 963.2 | 1,000.0
Senior Unsecured Notes [Member] | Senior Unsecured 5⅜% Notes due February 2027 [Member] | Targa Resources Partners LP [Member] |  |  |
Long-term [Abstract] |  |  |
Long-term debt | [1] | 468.1 | 500.0
Senior Unsecured Notes [Member] | Senior Unsecured 5% Notes due January 2028 [Member] | Targa Resources Partners LP [Member] |  |  |
Long-term [Abstract] |  |  |
Long-term debt | [1] | 700.3 | 750.0
Senior Unsecured Notes [Member] | Senior Unsecured 6½% Senior Notes due July 2027 [Member] | Targa Resources Partners LP [Member] |  |  |
Long-term [Abstract] |  |  |
Long-term debt | [1] | 705.2 | 750.0
Senior Unsecured Notes [Member] | Senior Unsecured of 6⅞% Senior Notes due January 2029 [Member] | Targa Resources Partners LP [Member] |  |  |
Long-term [Abstract] |  |  |
Long-term debt | [1] | 679.3 | 750.0
Senior Unsecured Notes [Member] | Senior Unsecured of 5½% Senior Notes due March 2030 [Member] | Targa Resources Partners LP [Member] |  |  |
Long-term [Abstract] |  |  |
Long-term debt | [1] | 949.6 | 1,000.0
Senior Unsecured Notes [Member] | Senior Unsecured 4⅞% Notes due February 2031 [Member] | Targa Resources Partners LP [Member] |  |  |
Long-term [Abstract] |  |  |
Long-term debt | [1] | 1,000.0 | 0.0
Senior Unsecured Notes [Member] | Targa Pipeline Partners LP [Member] | Senior Unsecured 4 3/4% Notes due November 2021 [Member] |  |  |
Long-term [Abstract] |  |  |
Long-term debt | [4] | 0.0 | 6.5
Senior Unsecured Notes [Member] | Targa Pipeline Partners LP [Member] | Senior Unsecured 5 7/8% Notes due August 2023 [Member] |  |  |
Long-term [Abstract] |  |  |
Long-term debt | [4] | 48.1 | 48.1
Unamortized premium |  | 0.2 | 0.3
Secured Debt [Member] | TRC Senior Secured Revolving Credit Facility [Member] | Targa Resources Partners LP [Member] |  |  |
Long-term [Abstract] |  |  |
Letters of credit outstanding | [5] | 0.0 | 0.0
Revolving Credit Facility [Member] | TRC Senior Secured Revolving Credit Facility due June 2023 [Member] |  |  |
Long-term [Abstract] |  |  |
Long-term debt | [5] | 555.0 | 435.0
Revolving Credit Facility [Member] | TRP Senior Secured Revolving Credit Facility due June 2023 [Member] | Targa Resources Partners LP [Member] |  |  |
Long-term [Abstract] |  |  |
Letters of credit outstanding | [3] | $ 44.4 | $ 88.2
[1] | While we consolidate the debt of the Partnership in our financial statements, we do not have the obligation to make interest payments or debt payments with respect to the debt of the Partnership.
[2] | As of December 31, 2020, the Partnership had $350.0 million of qualifying receivables under its $350.0 million Securitization Facility, resulting in zero availability.
[3] | As of December 31, 2020, availability under the Partnership’s $2.2 billion senior secured revolving credit facility (“TRP Revolver”) was $1,875.6 million.
[4] | TPL” refers to Targa Pipeline Partners LP.
[5] | As of December 31, 2020, availability under TRC’s $670.0 million senior secured revolving credit facility (“TRC Revolver”) was $115.0 million.

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