Financial instruments - (Schedule of interest rate risk) (Details) - Interest rate risk [Member] - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure of detailed information about financial instruments [line items] | ||
| Sensitivity analysis, variance, percentage | 2.00% | 2.00% |
| Effect of variance increase on after-tax profit | $ 8.3 | $ 8.5 |
| Effect of variance decrease on after-tax profit | $ (8.3) | $ (8.5) |