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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% |  |

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