Partnership Units and Related Matters - Summary of Distributions Declared and Paid by the Partnership (Details) - Distributions Paid [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Distributions Made To Members Or Limited Partners [Abstract]
Distributions payable date	May 12, 2022	Feb. 11, 2022
Total Distributions	$ 103.7	$ 103.7
Distributions to Targa Resources Corp.	$ 103.7	$ 103.7