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Income taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Income Tax Examination [Line Items] |  |  |  |  |  |
Effective tax rate |  |  | (38.00%) | (5.00%) |  | (5.00%)
Discrete tax expense (benefit) | $ 0.4 | $ 1.0 | $ 0.4 | $ 1.0 |  |
Forecast |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Effective tax rate |  |  |  |  | 20.00% |

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