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SHARE CAPITAL, OPTION PLANS AND SHARE-BASED PAYMENTS - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Nov. 05, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Cash Dividends          
Dividends declared per common share (in dollars per share)   $ 0.2008 $ 0.1746 $ 0.3754 $ 0.3492
Payments of dividends   $ 54,500,000 $ 47,100,000 $ 101,769,000 $ 94,098,000
Share Capital          
Preference shares issued (in shares)   0   0  
Treasury Stock          
Purchase of treasury stock (in shares)   0 0 965,154 300,000
Payments for repurchase of common stock   $ 0 $ 0 $ 41,870,000 $ 12,424,000
Issuance of treasury stock (in shares)   292,401 255,502 486,081 255,502
Stock Repurchase Plan          
Stock repurchase plan, shares acquired (in shares)   0 0 965,154 300,000
Share Repurchase Plan          
Treasury Stock          
Purchase of treasury stock (in shares)   0   0  
Stock Repurchase Plan          
Stock repurchase plan, period in force 12 months        
Stock repurchase plan, authorized amount $ 350,000,000        
Stock repurchase plan, shares acquired (in shares)   0   0