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Share Capital, Option Plans and Share-Based Payments - Cash Dividends, Share Capital, Treasury Stock, Share Repurchase Plan (Details) - USD ($)
 3 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Jul. 26, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Dividends declared per common share (in dollars per share) $ 0.23 $ 0.2  
Payments of dividends $ 27,791,000 $ 23,312,000  
Preference shares issued (in shares) 0    
Amount authorized to be repurchased (up to)     $ 200,000,000
Common shares repurchased and cancelled during period, shares (in shares)   1,131,812  
Common shares repurchased and cancelled during period, value   $ 50,000,000  
Long Term Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Issuance of treasury stock (in shares) 4,167 0