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Income taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2025 | Dec. 31, 2024
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |  |  |
Effective tax rate (as a percent) | (81.60%) | 24.60% | 171.00% | 20.30% |  |
Unrecognized tax benefits that would impact effective tax rate | $ 45.9 |  | $ 45.9 |  |  | $ 41.7
Unrecognized tax benefits, accrued interest and penalties | $ 0.1 |  | $ 0.1 |  |  | $ 0.1
Estimated annual effective tax rate percent (as a percent) |  |  |  |  |  | 0.90%
Forecast |  |  |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |  |  |
Effective tax rate (as a percent) |  |  |  |  | 172.80% |

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