Environmental and other provisions (Narrative) (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure of other provisions [line items] | ||
| Re-evaluation adjustment - environmental provision | $ (0.2) | $ 3.5 |
| Bottom of range [Member] | ||
| Disclosure of other provisions [line items] | ||
| Provision estimates, discount rate used | 2.41% | 2.87% |
| Top of range [Member] | ||
| Disclosure of other provisions [line items] | ||
| Provision estimates, discount rate used | 4.95% | 4.88% |