Early Deposit Mineral Stream Interests - Summary of Early Deposit Mineral Stream Interests (Parenthetical) (Detail) - Cotabambas [member] - Agreement Agreement in Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2026 |
Dec. 31, 2025 |
|
| Disclosure Of Mineral Stream Interests [line items] | ||
| Silver Equivalent ounces to be delivered before entitlement step down takes effect | 90 | 90 |
| Percentage of gold production at the mine which WPM is entitled to after step down | 16.67% | 16.67% |
| Percentage of silver production at the mine which WPM is entitled to after step down | 66.67% | 66.67% |