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Employee benefits - Sensitivity analysis (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Mar. 09, 2022
Dec. 31, 2019
Disclosure of Share based option plan        
Weighted average duration of the defined benefit obligation 9 years 10 years    
Expected contributions to the funded defined benefit pension plan $ 0.6      
Increase of the number of shares available for issuance by an additional     3,200,000  
Stock options        
Disclosure of Share based option plan        
Percentage of share capital       5.00%
Stock options | 2020 share incentive plan        
Disclosure of Share based option plan        
Maximum aggregate number of ordinary shares available for issuance 1,000,000      
Discount rate (0.5% movement)        
Disclosure of Share based option plan        
Reasonably possible increase in actuarial assumption (as a percent) 0.50%      
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ (1.4)      
Decrease (increase) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ 1.3      
Future benefit growth (0.5% movement)        
Disclosure of Share based option plan        
Reasonably possible increase in actuarial assumption (as a percent) 0.50%      
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption $ 2.2      
Decrease (increase) in defined benefit obligation due to reasonably possible decrease in actuarial assumption $ (2.2)