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Share-based compensation - Fair value inputs (Details) - $ / shares
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Share-Based Payment Arrangements [Abstract]    
Weighted average stock price valuation (in cad per share) $ 52.38 $ 54.26
Weighted average exercise price (in cad per share) $ 52.38 $ 54.26
Risk-free interest rate 2.98% 2.03%
Expected life in years 4.5 6.25
Expected dividend yield 0.00% 0.00%
Volatility 65.00% 61.00%
Weighted average fair value of options issued (in cad per share) $ 28.26 $ 31.67