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Partnership Units and Related Matters - Summary of Distributions Declared or Paid by the Partnership (Details) - Distributions Paid [Member] - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Distributions Made To Members Or Limited Partners [Abstract]        
Distributions payable date Nov. 13, 2018 Aug. 13, 2018 May 11, 2018 Feb. 12, 2018
Total Distributions $ 237.6 $ 234.0 $ 229.7 $ 228.5
Distributions to Targa Resources Corp. $ 234.8 $ 231.2 $ 226.9 $ 225.7