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Shareholders' equity - Stock-based payments - Assumptions & Options (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2018
CAD ($)
EquityInstruments
Y
$ / shares
Dec. 31, 2018
USD ($)
EquityInstruments
Y
Dec. 31, 2017
CAD ($)
EquityInstruments
Y
$ / shares
Dec. 31, 2017
USD ($)
EquityInstruments
Y
Dec. 31, 2018
USD ($)
EquityInstruments
Y
May 09, 2018
shares
Dec. 31, 2017
USD ($)
EquityInstruments
Y
Stock-based payments              
Aggregate number of common shares | shares           9,700,876  
Risk-free interest rate   2.05%   1.65%      
Expected dividend yield   1.38%   1.19%      
Expected price volatility of the Company's common shares   32.70%   36.10%      
Expected life of the option | Y   5   5      
Forfeiture rate   0.00%   0.00%      
Weighted average life | Y 7.00       7.00    
Stock options outstanding, beginning of year (in shares)   955,603   1,304,328      
Granted (in shares) | EquityInstruments   153,824   97,789      
Exercised (in shares) | EquityInstruments   (94,018)   (433,718)      
Forfeited (in shares) | EquityInstruments       (12,796)      
Stock options outstanding, end of the year (in shares)   1,015,409   955,603      
Exercisable stock options, end of the year (in shares) | EquityInstruments 710,064   617,539   710,064   617,539
Stock options outstanding, beginning of year (in dollars per share)   $ 64.48   $ 50.64      
Granted (in dollars per share)   92.77   100.10      
Exercised (in dollars per share)   60.49   30.79      
Forfeited (in dollars per share)       67.81      
Stock options outstanding, end of the year (in dollars per share)   $ 69.13   64.48      
Exercisable stock options, end of the year (in dollars per share)         $ 60.40   $ 55.88
Stock options              
Stock-based payments              
Period to issue common shares to single insider participant under compensation plan   1 year          
Maximum percentage of common shares issued to single insider participant under compensation plan within one year 5.00%       5.00%    
Term of options   10 years          
Vesting period   3 years          
Weighted average fair value per stock option $ 3.0   $ 3.0        
Weighted average fair value per stock option (in dollars per share) | $ / shares $ 25.77   $ 30.30        
Expenses related to stock options   $ 2,600,000   3,100,000      
Capitalized to royalty, stream and working interest, net   $ 400,000   $ 500,000      
Total unrecognized non-cash stock-based compensation expense         $ 3,900,000   $ 4,200,000
Weighted average life | Y 1.7   1.4   1.7   1.4