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SHARE-BASED COMPENSATION PLANS - Nonqualified Stock Options Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding, beginning balance (in shares) 13.4 18.0  
Share-based compensation expense $ 28.4 $ 42.2 $ 11.7
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding options grant price (dollars per share) $ 8.25    
Exercisable options grant price (dollars per share) 9.20    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding options grant price (dollars per share) 20.42    
Exercisable options grant price (dollars per share) $ 10.50    
Nonqualified Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 0.0 2.2 19.4
Vesting period 5 years    
Nonqualified stock options contractual life 10 years    
Share-based compensation expense $ 0.5 $ 3.6 $ 4.3
Nonqualified Options | Tranche One      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 6.4    
Nonqualified Options | Tranche Two      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 7.0    
Nonqualified Options | Tranche Two, Subtranche One      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Award vesting rights, percentage 60.00%    
Nonqualified Options | Tranche Two, Subtranche Two      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Award vesting rights, percentage 20.00%    
Nonqualified Options | Tranche Two, Subtranche Three      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 5 years    
Award vesting rights, percentage 20.00%