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Partnership Units and Related Matters - Additional Information (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2021 USD ($)
Limited Partners Capital Account [Line Items] |
Capital contributions to partnership | $ 36.0
Holders of Limited Partner Interests [Member] |
Limited Partners Capital Account [Line Items] |
Limited partner capital contribution allocation percentage | 98.00%
Targa Resources General Partner LLC [Member] |
Limited Partners Capital Account [Line Items] |
General partner capital contribution allocation percentage | 2.00%

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