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Shareholders equity - Share Purchase Warrants and Deferred share unit plan (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
DSU plan    
Stock-based payments    
Number of other equity instruments outstanding in share-based payment arrangement at beginning of period 119,025 104,740
Granted 15,416 14,285
Settled (26,806)  
Number of other equity instruments outstanding in share-based payment arrangement at end of period 107,635 119,025
DSU liability | $ $ 14.9 $ 14.9