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Share Capital, Option Plans and Share-Based Payments - Additional Information (Details)
 3 Months Ended 9 Months Ended
Jan. 24, 2017
Dec. 21, 2016
shares
Mar. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
$ / shares
shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Jul. 26, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock split ratio 2 2            
Share sub-division (in shares)   1            
Dividends declared per common share (in dollars per share) | $ / shares     $ 0.115   $ 0.1 $ 0.345 $ 0.3  
Payments of dividends | $     $ 30,300,000   $ 24,100,000 $ 85,953,000 $ 71,627,000  
Preference shares issued (in shares)     0     0    
Common shares repurchased (in shares)     123,785   0 123,785 450,000  
Stock repurchase amount | $     $ 4,200,000   $ 0 $ 4,200,000 $ 10,600,000  
Issuance of treasury stock (in shares)     44,000   20,000 393,922 434,156  
Authorized repurchase amount | $               $ 200,000,000
Stock repurchased under the repurchase plan (in shares)     0     0    
Common shares repurchased and cancelled during period, shares (in shares)             2,952,496  
Common shares repurchased and cancelled during period, value | $             $ 65,500,000  
Long Term Incentive Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Issuance of treasury stock (in shares)       339,922