Retirement benefit obligations - Disclosure of main actuarial assumptions used to measure the retirement benefit obligations (Details) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of defined benefit plans [line items] | |||
| Discount Rate (IBoxx Corporates AA) | 3.70% | 3.34% | 0.90% |
| Salary increase rate | 3.00% | ||
| Turnover rate, average exit rate | 2.02% | 2.05% | |
| Employee contribution rate | 45.00% | 45.00% | 45.00% |
| Top of range | |||
| Disclosure of defined benefit plans [line items] | |||
| Turnover rate | 5.80% | ||
| Bottom of range | |||
| Disclosure of defined benefit plans [line items] | |||
| Turnover rate | 0.00% | 0.00% | 0.05% |
| Key magement | |||
| Disclosure of defined benefit plans [line items] | |||
| Retirement age | 65 years | 65 years | 65 years |
| Salary increase rate | 3.00% | 3.00% | |
| Other employees | |||
| Disclosure of defined benefit plans [line items] | |||
| Retirement age | 64 years | 64 years | 63 years |
| Salary increase rate | 2.55% | 2.55% | |