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Share-based compensation (Narrative) (Details)
1 Months Ended 12 Months Ended
Jan. 31, 2020
shares
Dec. 31, 2019
CAD ($)
share
$ / shares
shares
Dec. 31, 2018
CAD ($)
share
$ / shares
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weighted average share price | $   $ 16.24 $ 14.71
Share-based compensation related to share options | $   $ 2,900,000 $ 3,100,000
Deferred Share Units ("DSU") [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Weighted average value | $ / shares   $ 13.61 $ 13.18
Number of units, transfer from cash-settled to equity-settled | share   282,376 0
Restricted Share Units ("RSU") [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of restricted stock units granted | shares     68,162
Number of restricted stock units granted after reinvestment of dividends | shares     70,320
Value of restricted stock units granted | $     $ 1,000,000
Weighted average value | $ / shares   $ 13.61 $ 12.97
Number of units, transfer from cash-settled to equity-settled | share   0 428,090
Restricted Share Units ("RSU") [Member] | Officers [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of restricted stock units granted | shares   150,000  
Weighted average value | $ / shares   $ 12.70  
Vesting period   3 years  
Additional number of restricted stock units granted | shares   75,000  
Weighted average value | $ / shares   $ 12.70  
Number of shares issuable | shares   75,000  
Restricted Share Units ("RSU") [Member] | Events after reporting period      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of restricted stock units granted | shares 32,492    
Restricted Share Units ("RSU") [Member] | Events after reporting period | Officers [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Number of shares issued due to additional number of restricted stock units granted | shares 34,852    
DSU and RSU [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Share-based compensation | $   $ 5,400,000 $ 2,700,000
Closing price of the common shares | $   $ 12.62  
Marginal income tax rate   53.30%  
Employees tax obligations settlement amount related to vested RSU | $   $ 2,300,000 400,000
Employees tax obligations settlement amount related to outstanding RSU | $   $ 10,200,000 $ 5,400,000