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Shareholders' equity - Equity incentive plan (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Share-based compensation expense | $ $ 20.4 $ 17.0
RSU's    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of RSU's granted (shares) 63,128 372,000
Trust acquired shares    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of shares held by the Trust at the beginning of the period (shares) 630,431 774,405
Acquired (shares) 154,131 180,594
Released on vesting (shares) (331,672) (324,568)
Number of shares held by the Trust at the end of the period (shares) 452,890 630,431