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ORGANIZATION AND BASIS OF PRESENTATION Narrative 2 (Details) - Series D Preferred Limited Partner [Member] - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended
Jul. 13, 2018
Jun. 29, 2018
Jul. 13, 2018
Subsequent Event [Line Items]      
Temporary Equity, Stock Issued During Period, Value, New Issues   $ 370.7  
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Issuance of preferred units (temporary equity) (in units) 7,486,209   7,486,209
Units issued, price per unit $ 25.38   $ 25.38
Temporary Equity, Stock Issued During Period, Value, New Issues $ 185.2   $ 555.9