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EQUITY (Details) - USD ($)
$ / shares in Units, shares in Millions
3 Months Ended 6 Months Ended 21 Months Ended
Jul. 27, 2017
Mar. 30, 2017
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jul. 24, 2017
Class of Stock [Line Items]                        
Transfer of interests under common control                     $ 0  
Common Units                        
Class of Stock [Line Items]                        
Unit distribution announced per quarter (in dollars per unit)         $ 0.17 $ 0.17 $ 0.16 $ 0.16 $ 0.16 $ 0.16    
Common Units | Forecast                        
Class of Stock [Line Items]                        
Unit distribution announced per quarter (in dollars per unit)     $ 0.17 $ 0.17                
2015 Unit Repurchase Program                        
Class of Stock [Line Items]                        
Unit repurchase program, authorized amount         $ 750,000,000.0           750,000,000.0  
Total Capital - Common Units                        
Class of Stock [Line Items]                        
Transfer of interests under common control   $ 10,300,000                 $ 10,281,000  
KIFL                        
Class of Stock [Line Items]                        
Ownership percentage   60.00%                    
KKR Holdings                        
Class of Stock [Line Items]                        
Transfer of interests under common control   $ 7,900,000                    
Subsequent Event | Common Units                        
Class of Stock [Line Items]                        
Unit distribution announced per quarter (in dollars per unit) $ 0.17                      
Subsequent Event | 2015 Unit Repurchase Program                        
Class of Stock [Line Items]                        
Payments to repurchase common units                       $ 459,000,000
Units repurchased (in units)                       31.7