Fair value (Details) - USD ($) |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2026 |
Dec. 31, 2025 |
|
| Level 1 | Equity price risk | ||
| Disclosure of Fair Value Measurement of Assets and Liabilities [Line Items] | ||
| Change in risk variable, percent | 10.00% | |
| Movement in other comprehensive income | $ 224,000 | $ 102,000 |
| Level 3 | Discount rate risk | ||
| Disclosure of Fair Value Measurement of Assets and Liabilities [Line Items] | ||
| Change in risk variable, percent | 10.00% | |
| Movement in other comprehensive income | $ 274,000 | 266,000 |
| Level 3 | Sales volume risk | ||
| Disclosure of Fair Value Measurement of Assets and Liabilities [Line Items] | ||
| Change in risk variable, percent | 10.00% | |
| Movement in profit before tax | $ 239,000 | $ 275,000 |