Financial instruments (Schedule of foreign currency risk) (Details) - Currency risk [Member] - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| USD / CAD exchange rate [Member] | ||
| Disclosure of detailed information about financial instruments [line items] | ||
| Sensitivity analysis, variance, percentage | 10.00% | 10.00% |
| Effect of variance increase on after-tax profit | $ 1.2 | $ 6.0 |
| Effect of variance decrease on after-tax profit | $ (1.4) | $ (7.4) |
| USD / PEN exchange rate [Member] | ||
| Disclosure of detailed information about financial instruments [line items] | ||
| Sensitivity analysis, variance, percentage | 10.00% | 10.00% |
| Effect of variance increase on after-tax profit | $ 7.0 | $ 4.4 |
| Effect of variance decrease on after-tax profit | $ (8.6) | $ (6.2) |