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Partnership Units and Related Matters - Summary of Distributions Declared and Paid by the Partnership (Details) - Distributions Paid [Member] - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Distributions Made To Members Or Limited Partners [Abstract]      
Distributions payable date Aug. 12, 2021 May 12, 2021 Feb. 11, 2021
Total Distributions $ 45.5 $ 47.0 $ 54.3
Distributions to Targa Resources Corp. $ 45.5 $ 47.0 $ 47.6