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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
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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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