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Share Capital, Option Plans and Share-Based Payments - RSU's, DSU's and ESPP (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 01, 2016
Dec. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Employee Share Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards purchase price discount 15.00% 5.00%    
Common shares eligible for issuance (in shares)     51,816  
Cash received from employee stock purchase plan     $ 2.9 $ 1.0
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Units granted (in shares)     3,900 0
Award vesting period     3 years  
Issuance of treasury stock (in shares)     4,167 0
Issuance of treasury stock     $ 0.1  
Deferred Stock Units (DSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Units granted (in shares)     1,221 556