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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
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Distributions Made To Members Or Limited Partners [Abstract]
Distributions payable date	Feb. 11, 2021	Nov. 13, 2020	Aug. 13, 2020	May 13, 2020	Feb. 13, 2020	Nov. 13, 2019	Aug. 13, 2019	Apr. 05, 2019	Feb. 13, 2019	Nov. 13, 2018	Aug. 13, 2018	May 11, 2018
Total Distributions	$ 54.3	$ 51.7	$ 51.7	$ 53.1	$ 241.9	$ 242.1	$ 242.4	$ 437.8	$ 241.3	$ 237.6	$ 234.0	$ 229.7
Distributions to Targa Resources Corp.	$ 47.6	$ 48.9	$ 48.9	$ 50.3	$ 239.1	$ 239.3	$ 239.6	$ 435.0	$ 238.5	$ 234.8	$ 231.2	$ 226.9

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- Definition

The other distribution in cash to parent that is recorded as a decrease in equity.

+ References

No definition available.

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- Definition

Date of distribution for distribution of cash or unit to limited partner of limited partnership (LP), in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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- Definition

Total distributions to each class of partners (i.e., general, limited and preferred partners).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770

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