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v3.20.4

Related Party Transactions - Summary of Transactions with Unconsolidated Affiliates (Details) - Targa Resources Partners LP [Member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |
Revenues | $ 18.1 | $ 11.1 | $ 5.6
Product purchases | (73.9) | (40.5) | (14.1)
Operating expenses | (19.6) | (3.4) | (3.6)
General and administrative expenses | (0.8) | (0.3) |
Gulf Coast Fractionators LP [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenues | 0.4 | 0.3 | 0.3
Product purchases |  | (7.9) | (5.1)
Operating expenses | (16.0) |  |
T2 Joint Ventures [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenues | 4.5 | 3.7 | 5.2
Product purchases |  |  | (0.6)
Operating expenses | (1.2) | (2.0) | (3.6)
Cayenne [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Product purchases | (5.9) | (7.9) | (7.2)
Operating expenses | (0.2) | (0.2) |
GCX [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenues | 0.6 | 0.8 | 0.1
Product purchases | (68.0) | (24.7) | $ (1.2)
Little Missouri 4 [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenues | 12.6 | 6.3 |
Operating expenses | (2.2) |  |
General and administrative expenses | $ (0.8) | (0.3) |
Agua Blanca [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Operating expenses |  | $ (1.2) |

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