v3.8.0.1
ACQUISITIONS Narrative 2 (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 28, 2017
Apr. 18, 2017
Mar. 31, 2018
Mar. 31, 2017
Business Acquisition [Line Items]        
General partner ownership interest     2.00% 2.00%
Common Limited Partner [Member]        
Business Acquisition [Line Items]        
Issuance of units (units)   14,375,000    
General Partner [Member]        
Business Acquisition [Line Items]        
Net proceeds from issuance of units   $ 13.6    
General partner ownership interest     2.00%  
Series B Preferred Limited Partner [Member]        
Business Acquisition [Line Items]        
Issuance of units (units) 15,400,000      
Logistics Notes Due 2027 [Member]        
Business Acquisition [Line Items]        
Senior notes issued $ 550.0      
Stated interest rate 5.625%