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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 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Issuance of treasury stock (in shares) 20,000 44,000 407,443 393,922
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Units granted (in shares) 0 0 4,464 7,800
Award vesting period     3 years  
Issuance of treasury stock (in shares) 20,000 44,000 94,792 54,000
Stock issued $ 0.4 $ 1.0 $ 2.0 $ 1.1
Deferred Stock Units (DSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Units granted (in shares) 3,037 2,302 83,846 77,998
Employee Share Purchase Plan (ESPP)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards purchase price discount     15.00%  
Common shares eligible for issuance (in shares) 201,726 129,579 540,343 349,435
Cash received from employee stock purchase plan $ 5.8 $ 3.8 $ 15.9 $ 10.0