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Stock-based compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2024
May 01, 2024
Dec. 31, 2023
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense   $ 225.5    
Weighted average period over which unrecognized compensation expense would be recognized (in years)   2 years 9 months 18 days    
Fair value of units vested   $ 50.6    
Incremental cost $ 5.7      
Weighted-average grant-date fair value (in dollars per share)   $ 21.74   $ 24.49
ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average period over which unrecognized compensation expense would be recognized (in years)   4 months    
Eligible employee compensation   $ 0.9   $ 1.0
Common stock reserved for future issuance (in shares)   5,757,984    
Weighted-average grant-date fair value (in dollars per share)     $ 5.06  
Unrecognized compensation expense   $ 0.6    
Omnibus Incentive Plan 2020 | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years)   4 years