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SHAREHOLDERS' EQUITY: Stock-Based Employee Compensation, Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation $ (0.0) $ 2.5 $ 2.1 $ 7.1
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Restricted stock units | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Restricted stock units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     5 years  
Restricted stock units | Tranche 1        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     33.33%  
Restricted stock units | Tranche 2        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     33.33%  
Restricted stock units | Tranche 3        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     33.33%  
Performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Threshold trading days     50 days  
Performance-based restricted stock units | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period     3 years  
Performance-based restricted stock units | Tranche 1 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     200.00%