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Partnership Units and Related Matters - Summary of Distributions Declared and Paid by the Partnership (Details) - Distributions Paid [Member] - USD ($) $ in Millions | 3 Months Ended
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Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Distributions Made To Members Or Limited Partners [Abstract] |  |  |
Distributions payable date | Aug. 13, 2020 | May 13, 2020 | Feb. 13, 2020
Total Distributions | $ 51.7 | $ 53.1 | $ 241.9
Distributions to Targa Resources Corp. | $ 48.9 | $ 50.3 | $ 239.1

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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=27012166&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=27012166&loc=d3e187171-122770 + Details
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