v3.10.0.1
ORGANIZATION AND BASIS OF PRESENTATION Narrative 1 (Details)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended
Jul. 13, 2018
USD ($)
$ / shares
shares
Jun. 29, 2018
USD ($)
$ / shares
shares
Apr. 18, 2017
shares
Jul. 13, 2018
USD ($)
$ / shares
shares
Jun. 30, 2018
shares
Jul. 20, 2018
Rate
Dec. 31, 2017
shares
Class of Stock [Line Items]              
Series D preferred units outstanding         15,760,441   0
Organization and Operations [Abstract]              
Common limited partner ownership interest held by general partner         11.00%    
Number of business segments         3    
Series D Preferred Limited Partner [Member]              
Class of Stock [Line Items]              
Temporary Equity, Stock Issued During Period, Value, New Issues | $   $ 370.7          
Series D preferred units outstanding   15,760,441          
Common Limited Partner [Member]              
Class of Stock [Line Items]              
Units issued, price per unit | $ / shares   $ 24.17          
Issuance of units (permanent equity) (in units)   413,736 14,375,000        
Subsequent Event [Member]              
Organization and Operations [Abstract]              
Common unit conversion rate | Rate           55.00%  
Subsequent Event [Member] | Series D Preferred Limited Partner [Member]              
Class of Stock [Line Items]              
Temporary Equity, Stock Issued During Period, Value, New Issues | $ $ 185.2     $ 555.9      
Series D preferred units outstanding 23,246,650     23,246,650      
Units issued, price per unit | $ / shares $ 25.38     $ 25.38