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SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - Long-Term Incentive Plans (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Issuance of treasury stock (in shares)   509,721 480,574 613,524
Payments for repurchase of common stock   $ 64.8 $ 12.4 $ 26.5
Long Term Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Term of plan   3 years    
Compensation cost related to unvested awards not yet recognized   $ 28.8    
Unvested stock awards compensation cost, weighted average recognition period   1 year 9 months 18 days    
Issuance of treasury stock (in shares) 292,401      
Payments for repurchase of common stock $ 11.2