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EQUITY - Issuance of Series A Preferred Stock (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Jun. 14, 2019
Feb. 04, 2019
Nov. 16, 2017
Mar. 27, 2017
Feb. 16, 2017
Class of Stock [Line Items]                
Number of Shares Awarded at Grant Date (millions of shares) 9.4 5.0            
Number of Shares Outstanding (millions of shares) 9.4 5.0            
Share-based compensation expense $ 15.2 $ 33.4 $ 29.0          
Series A Preferred Stock                
Class of Stock [Line Items]                
Number of Shares Awarded at Grant Date (millions of shares)           1.0 1.0 0.5
Number of Shares Outstanding (millions of shares) 1.5         0.2 1.0 0.3
Hurdle Price per Share (in dollars per share)           $ 19.85 $ 22.39 $ 22.66
Series A-1 Preferred Stock                
Class of Stock [Line Items]                
Number of Shares Awarded at Grant Date (millions of shares)       1.0 6.9      
Number of Shares Outstanding (millions of shares) 7.9     1.0 6.9      
Hurdle Price per Share (in dollars per share)       $ 14.48 $ 8.75      
Selling, general and administrative                
Class of Stock [Line Items]                
Share-based compensation expense $ 33.5 33.4 29.0          
Selling, general and administrative | Series A Preferred Stock                
Class of Stock [Line Items]                
Share-based compensation expense $ (0.1) $ (1.7) $ 3.8