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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense   $ 29.4 $ 26.5 $ 48.7
Deferred taxes   $ 7.3 $ 10.1 $ 18.5
Estimated effective income tax rate 38.00% 25.00%   38.00%
Restricted Stock | Employee        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   3 years    
Restricted Stock | Director        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   1 year    
Performance Share Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   3 years    
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   3 years    
Share based payment award, term   10 years    
Stock options, expiration period   12 months    
2013 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number common stock awards authorized (in shares)   11.3    
Shares available for grant (in shares)   3.6