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Stock-based compensation - Narrative (Details) - Restricted Stock Units (RSUs)
$ in Millions
9 Months Ended
Sep. 30, 2025
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation expense, RSUs $ 176.0
Weighted average period over which unrecognized compensation expense would be recognized (in years) 2 years 8 months 12 days
Fair value of RSUs vested $ 75.1
Omnibus Incentive Plan 2020  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting period (in years) 4 years