Net Income Per Limited Partner Unit (Policies)	9 Months Ended
	Sep. 30, 2020
Partners' Capital Notes [Abstract]
Net Income Per Limited Partner Unit	Net income per limited partner unit applicable to common units is computed by dividing the limited partners’ interest in net income by the weighted-average number of common units outstanding for the period. Prior to August 1, 2019, we had more than one class of participating securities and used the two-class method to calculate net income per unit applicable to the limited partners. The classes of participating securities prior to August 1, 2019, included common units, general partner units and incentive distribution rights (IDRs). Effective August 1, 2019, common units are the only participating securities. For the three and nine months ended September 30, 2020 and 2019, our preferred units are potentially dilutive securities and were dilutive to net income per limited partner unit.