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Shareholders' equity - Restricted stock unit (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
EquityInstruments
shares
Dec. 31, 2017
USD ($)
EquityInstruments
Bottom    
Stock-based payments    
Target settlement range 0% to 100% 0.00%  
Top    
Stock-based payments    
Target settlement range 0% to 100% 100.00%  
Restricted Share Units    
Stock-based payments    
Number of shares for each RSU vests | shares 1  
Fair value of RSUs granted $ 3.4 $ 3.3
Number of trading days immediately preceding the date of conversion or award grant for determining fair value 5 days  
Stock-based compensation expenses $ 2.6 1.5
Capitalised to royalty, stream and working interest 0.5 0.3
Total unrecognized non-cash stock-based compensation expense $ 5.4 $ 5.3
Expected to be recognized over weighted average period 2 years 1 month 6 days 1 year 6 months
Performance based RSU    
Stock-based payments    
Vesting period 3 years  
Granted | EquityInstruments 24,724 21,095
Time-based RSU    
Stock-based payments    
Vesting period 3 years  
Granted | EquityInstruments 24,341 20,745