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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