v3.26.1
EQUITY AND CONVERTIBLE PREFERRED STOCK - Preferred Stock (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Jun. 30, 2026
USD ($)
vote
$ / shares
shares
Jun. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2024
USD ($)
Jun. 30, 2021
$ / shares
shares
Aug. 27, 2021
shares
Mar. 27, 2017
$ / shares
shares
Class of Stock [Line Items]            
Preferred stock, shares authorized (in shares) 20,000,000.0 20,000,000.0        
Preferred stock, shares outstanding (in shares) 1,000,000.0 1,000,000.0        
Preferred stock, par value (in dollars per share) | $ / shares $ 0.01 $ 0.01        
Preferred stock, shares issued (in shares) 1,000,000.0 1,000,000.0        
Total share-based compensation (income) expense | $ $ 46.3 $ 50.0 $ 88.8      
Preferred stock classified as a liability | $ 0.0 0.0        
Former Board of Directors Chairman | Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense            
Class of Stock [Line Items]            
Total share-based compensation (income) expense | $ $ 0.0 $ 0.0 (0.8)      
Series A Preferred Stock            
Class of Stock [Line Items]            
Preferred stock, shares authorized (in shares) 1,000,000.0          
Preferred stock, shares outstanding (in shares) 1,000,000.0 1,000,000.0        
Preferred stock, par value (in dollars per share) | $ / shares $ 0.01          
Number of votes entitled to holders | vote 0          
Preferred stock, shares issued (in shares) 1,000,000.0         1,000,000.0
Preferred stock, redemption price (in dollars per share) | $ / shares           $ 0.01
Convertible Series B Preferred Stock            
Class of Stock [Line Items]            
Preferred stock, par value (in dollars per share) | $ / shares       $ 0.01    
Investment agreement, shares to be sold (in shares)       1,000,000.0    
Investment agreement, sale of stock (in dollars per share) | $ / shares       $ 1,000    
Preferred stock dividend rate 9.00%          
Dividends, preferred stock | $ $ 13.2 $ 13.2 13.2      
Payment of ordinary dividends, preferred stock and preference stock, declared during the period | $ 13.2 13.2 $ 13.2      
Noncash dividend | $ $ 3.3 $ 3.3        
Convertible Series B Preferred Stock | KKR Rainbow Aggregator L.P | HFS Holdings S.á r.l.            
Class of Stock [Line Items]            
Preferred stock, shares issued (in shares)         146,057