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Share-based compensation - Fair value inputs (Details)
3 Months Ended
Mar. 31, 2024
yr
$ / shares
Mar. 31, 2023
yr
$ / shares
Share-Based Payment Arrangements [Abstract]    
Weighted average stock price valuation (in dollars per share) $ 73.54 $ 52.38
Weighted average exercise price (in dollars per share) $ 73.54 $ 52.38
Risk-free interest rate 3.58% 2.98%
Expected life in years | yr 4.5 4.5
Expected dividend yield 0.00% 0.00%
Volatility 57.00% 65.00%
Weighted average fair value of options issued (in dollars per share) $ 36.70 $ 28.26