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SHARE-BASED COMPENSATION PLANS - Phantom Units (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 24, 2015
Jul. 21, 2015
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense     $ 15.2 $ 33.4 $ 29.0  
Former CEO | Phantom Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in shares)   300,000        
Phantom units value   $ 8.1        
Share-based compensation expense           $ 8.0
Former CEO | Phantom Units | Common Class A            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Phantom units value $ 8.0          
Share equivalent of Class A Common Stock (in shares)   1