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Net Income per Limited Partnership Unit - Additional Information (Details) - Equity Restructuring Agreement [Member] $ / shares in Units, $ in Millions |  | 3 Months Ended
--- | --- | ---
Jan. 15, 2020 USD ($) Tradingday $ / shares shares | Dec. 31, 2019
Distribution Made To Limited Liability Company L L C Member [Line Items] |  |
Distribution made to limited partner date of record |  | Feb. 06, 2020
DM CAP Holdings [Member] | IDRs [Member] |  |
Distribution Made To Limited Liability Company L L C Member [Line Items] |  |
Common unit issued | shares | 2,528,673 |
Common unit issued value | $ | $ 45 |
Common unit issued per share | $ / shares | $ 17.80 |
Number of business days prior to execution of agreement | 5 |
Number of volume weighted average trading price business days | 20 |

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