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Share-based compensation - Fair value inputs (Details) - $ / shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Share-Based Payment Arrangements [Abstract]    
Weighted average stock price valuation (in cad per share) $ 44.86 $ 62.09
Weighted average exercise price (in cad per share) $ 44.86 $ 62.09
Risk free interest rate (as a percent) 2.60% 1.15%
Expected life in years 6.25 6.25
Expected dividend yield (as a percent) 0.00% 0.00%
Volatility (as a percent) 63.00% 55.00%
Weighted average fair value of options issued (in cad per share) $ 26.98 $ 32.71