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Debt Obligations - Senior Unsecured Notes Issuances and Redemptions - Additional Information (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 17, 2021 | Feb. 22, 2021 | Apr. 30, 2021 | Feb. 28, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Senior Unsecured 4¼% Notes due November 2023 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on fixed rate debt | 4.25% |  | 4.25% |  |  |
Gain (loss) due to debt extinguishments |  |  | $ (1.9) |  |  |
Maturity date | Nov. 30, 2023 |  | May 17, 2021 |  |  |
Senior Unsecured Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on fixed rate debt |  |  |  | 5.125% |  |
Gain (loss) due to debt extinguishments |  |  |  | $ (14.9) |  |
Premium Paid |  |  |  | 12.5 |  |
Write-off debt issuance cost |  |  |  | 2.4 |  |
Senior Unsecured Notes [Member] | Senior Unsecured of 4% Senior Notes due 2032 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount issued |  |  |  | $ 1,000.0 |  |
Interest rate on fixed rate debt |  |  |  | 4.00% |  |
Net proceeds from private placement of notes |  |  |  | $ 991.0 |  |
Senior Unsecured Notes [Member] | Targa Pipeline Partners LP [Member] | Senior Unsecured 5⅞% Notes due August 2023 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on fixed rate debt |  |  |  |  | 5.875% | 5.875%
Maturity date |  |  |  |  | Aug. 31, 2023 | Aug. 31, 2023
Senior Unsecured Notes [Member] | Targa Resources Partners LP [Member] | Senior Unsecured 4¼% Notes due November 2023 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on fixed rate debt |  |  |  |  | 4.25% | 4.25%
Maturity date |  |  |  |  | Nov. 30, 2023 | Nov. 30, 2023
Senior Unsecured Notes [Member] | Targa Resources Partners LP [Member] | Targa Pipeline Partners LP [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Gain (loss) due to debt extinguishments |  | $ 0.2 |  |  |  |
Senior Unsecured Notes [Member] | Targa Resources Partners LP [Member] | Targa Pipeline Partners LP [Member] | Senior Unsecured 4¾% Notes due November 2021 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on fixed rate debt |  | 4.75% |  |  |  |
Senior Unsecured Notes [Member] | Targa Resources Partners LP [Member] | Targa Pipeline Partners LP [Member] | Senior Unsecured 5⅞% Notes due August 2023 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on fixed rate debt |  | 5.875% |  |  |  |

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