Income Taxes - Unrecognized (Details) - USD ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Non-capital Loss | ||
| Aggregate amount of taxable temporary differences associated with investments in subsidiaries for which deferred tax liabilities have not been recognized | $ 960.3 | $ 846.7 |
| Aggregate amount of deductible temporary differences associated with other items for which deferred tax assets have not been recognized | 650.8 | 675.0 |
| Royalty, stream and working interests. | ||
| Non-capital Loss | ||
| Aggregate amount of deductible temporary differences associated with other items for which deferred tax assets have not been recognized | $ 650.8 | $ 675.0 |