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PARTNERS' CAPITAL - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 26 Months Ended
Jun. 30, 2020
Jun. 30, 2020
May 31, 2018
Partners' capital      
Repurchase and retire authorization     $ 100
Treasury units retired $ 0    
Number of units retired   5,460,639  
Repurchase price (in dollars per unit)   $ 17.12  
Simplification Transactions      
Partners' capital      
Number of units retired   35