Employee benefit plans - Weighted average assumptions for periodic benefit cost (Details) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Employee benefit plans | |||
| Discount rate (as a percent) | 4.39% | 4.22% | 4.86% |
| Rate of compensation increase (as a percent) | 3.18% | 3.18% | 3.22% |
| Rate of pension increase (as a percent) | 2.00% | 2.00% | 2.00% |