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Share-based payment plans - Deferred Share Units (Details) - Deferred Share Units (DSU)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Number of Awards  
Outstanding at the beginning of the period (in shares) 79,460
Issued (in shares) 28,143
Outstanding at the end of the period (in shares) 107,603
Weighted Average Issuance Price  
Outstanding at the beginning of the period (per share) | $ / shares $ 50.13
Issued (per share) | $ / shares 55.43
Outstanding at the end of the period (per share) | $ / shares $ 51.52
Redeemed (in shares) 0