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Share Capital, Option Plans and Share-Based Payments - Long-Term Incentive Plans (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Issuance of treasury stock (in shares) 44,000   20,000 393,922 434,156
Unvested stock awards compensation cost, weighted average recognition period       2 years 2 months 8 days  
Long Term Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Term of plan       3 years  
Issuance of treasury stock (in shares)   339,922      
Issuance of treasury stock   $ 4.4      
Compensation cost related to unvested awards not yet recognized $ 16.1     $ 16.1  
Unvested stock awards compensation cost, weighted average recognition period       1 year 10 months 24 days