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Partnership Units and Related Matters - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Limited Partners Capital Account [Line Items] |  |  |  |
Capital contributions to partnership |  | $ 50.0 | $ 200.0 | $ 600.0
Number of units, redeemed | 5,000,000 |  |  |
Redemption price per unit | $ 25.00 | $ 25.00 |  |
Unpaid distributions | $ 0.5 |  |  |
Income attributable to mandatorily redeemable preferred interests |  | $ 4.9 |  | 4.1
Distribution to preferred unitholders |  | $ 15.1 | $ 11.3 | $ 11.3
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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- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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- Definition Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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