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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, 2020
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 2.2 19.4 5.9
Vesting period 3 years    
Outstanding, beginning balance (in shares) 18.0 27.9  
Share-based compensation expense $ 42.2 $ 11.7 $ 30.4
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]      
Vesting period 5 years    
Nonqualified stock options contractual life 10 years    
Share-based compensation expense $ 3.6 $ 4.3 $ 10.7
Nonqualified Options | Tranche One      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 9.8    
Nonqualified Options | Tranche Two      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 8.2    
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%