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Partnership Units and Related Matters (Tables) | 12 Months Ended
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Dec. 31, 2020
Partners Capital [Abstract] |
Schedule of Distributions | The following details the distributions declared or paid by the Partnership during 2020, 2019 and 2018:
Three Months Ended |  | Date Paid or To Be Paid |  | Total Distributions |  |  | Distributions to Targa Resources Corp. |
(In millions, except per share amounts) |
2020 |  |  |  |  |  |  |  |  |  |
December 31, 2020 |  | February 11, 2021 | $ |  | 54.3 |  |  | $ | 47.6 |
September 30, 2020 |  | November 13, 2020 |  |  | 51.7 |  |  |  | 48.9 |
June 30, 2020 |  | August 13, 2020 |  |  | 51.7 |  |  |  | 48.9 |
March 31, 2020 |  | May 13, 2020 |  |  | 53.1 |  |  |  | 50.3 |
2019 |  |  |  |  |  |  |  |  |  |
December 31, 2019 |  | February 13, 2020 | $ |  | 241.9 |  |  | $ | 239.1 |
September 30, 2019 |  | November 13, 2019 |  |  | 242.1 |  |  |  | 239.3 |
June 30, 2019 |  | August 13, 2019 |  |  | 242.4 |  |  |  | 239.6 |
March 31, 2019 |  | April 5, 2019 |  |  | 437.8 |  |  |  | 435.0 |
2018 |  |  |  |  |  |  |  |  |  |
December 31, 2018 |  | February 13, 2019 | $ |  | 241.3 |  |  | $ | 238.5 |
September 30, 2018 |  | November 13, 2018 |  |  | 237.6 |  |  |  | 234.8 |
June 30, 2018 |  | August 13, 2018 |  |  | 234.0 |  |  |  | 231.2 |
March 31, 2018 |  | May 11, 2018 |  |  | 229.7 |  |  |  | 226.9 |

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- Definition Tabular disclosure of payment of cash or stock made to limited partner of limited partnership (LP). + 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 + Details
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