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Shareholders equity - Restricted stock unit (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
EquityInstruments
Dec. 31, 2020
USD ($)
EquityInstruments
Stock-based payments    
Number of other equity instruments outstanding in share-based payment arrangement at beginning of period 102,708  
Number of other equity instruments outstanding in share-based payment arrangement at end of period 98,894 102,708
Restricted Share Units    
Stock-based payments    
Number of other equity instruments outstanding in share-based payment arrangement at beginning of period 102,708 108,978
Granted 54,643 37,065
Settled (58,457) (42,328)
Forfeited   (1,007)
Number of other equity instruments outstanding in share-based payment arrangement at end of period 98,894 102,708
Fair value of RSUs granted | $ $ 7.2 $ 5.0
Number of trading days immediately preceding the date of conversion or award grant for determining fair value 5 days  
Stock-based compensation expenses | $ $ 6.3 3.4
Capitalised to royalty, stream and working interest | $ 0.2 0.1
Total unrecognized non-cash stock-based compensation expense | $ $ 8.7 $ 7.7
Expected to be recognized over weighted average period 2 years 2 months 12 days 2 years 1 month 6 days
Performance based RSU    
Stock-based payments    
Number of other equity instruments outstanding in share-based payment arrangement at beginning of period 66,996 65,972
Granted 38,803 22,519
Settled (39,005) (20,883)
Forfeited   (612)
Number of other equity instruments outstanding in share-based payment arrangement at end of period 66,794 66,996
Time-based RSU    
Stock-based payments    
Number of other equity instruments outstanding in share-based payment arrangement at beginning of period 35,712 43,006
Granted 15,840 14,546
Settled (19,452) (21,445)
Forfeited   (395)
Number of other equity instruments outstanding in share-based payment arrangement at end of period 32,100 35,712