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Net Income Per Limited Partner Unit (Narrative) (Details) - Common Units - Cash Distribution - Subsequent Event
$ / shares in Units, $ in Millions
Jul. 21, 2020
USD ($)
$ / shares
Subsequent Event [Line Items]  
Quarterly cash distribution declared per limited partner unit (in dollars per share) | $ / shares $ 0.875
Distribution made to limited partner, cash distributions declared | $ $ 200