Operating income - Additional Information (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Other Income and Expenses [Abstract] | ||||
| Research tax credit | $ 1.6 | $ 2.8 | $ 3.1 | $ 5.0 |