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Share Capital, Option Plans and Share-Based Payments - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Dividends declared per common share (in dollars per share) $ 0.132000 $ 0.115000 $ 0.396 $ 0.345000
Payments of dividends $ 35,200 $ 30,300 $ 104,996 $ 85,953
Preference shares issued (in shares) 0   0  
Common shares repurchased (in shares)     0 123,785
Purchase of Treasury Stock     $ 0 $ 4,245
Issuance of treasury stock (in shares) 20,000 44,000 407,443 393,922