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Income taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Effective Income Tax Rate Reconciliation [Line Items]          
Effective tax rate (as a percent) 204.80% 19.10%      
Estimated annual effective tax rate percent (as a percent) (6.20%)        
Unrecognized tax benefits that would impact effective tax rate       $ 46.5 $ 41.7
Unrecognized tax benefits, accrued interest and penalties       $ 0.1 $ 0.1
Forecast          
Effective Income Tax Rate Reconciliation [Line Items]          
Effective tax rate (as a percent)     403.10%