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Acquisition of Argonaut Gold, Inc. (Narrative) (Details) $ in Millions, $ in Millions |  |  |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 12, 2024 shares | Jun. 12, 2024 USD ($) shares | Apr. 04, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Apr. 04, 2024 CAD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Other comprehensive income, net of tax, gains (losses) from investments in equity |  |  |  |  | $ 26.4 | $ (10.5) |
Profit (loss) before tax |  |  |  |  | 502.2 | $ 293.7 |
Florida Canyon Gold |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Percentage of voting equity interests acquired | 19.90% |  |  |  |  |  |
Argonaut Transaction |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Number of shares issued, business combination, value |  | $ 360.1 |  |  |  |  |
Total consideration |  | $ 419.0 |  |  |  |  |
Other comprehensive income, net of tax, gains (losses) from investments in equity |  |  | $ 26.1 |  |  |  |
Revenue of acquiree since acquisition date |  |  |  | $ 81.2 |  |  |
Profit of acquiree since acquisition date |  |  |  | $ 6.6 |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  |  |  | (1,441.2) |  |
Profit (loss) of combined entity as if combination occurred at beginning of period |  |  |  |  | $ 418.2 |  |
Argonaut Transaction | Argonaut |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests | 13.80% |  | 13.80% |  |  |  |
Non-controlling interest in acquiree recognised at acquisition date |  |  |  |  |  |  | $ 50
Total consideration |  |  | $ 58.9 |  |  |  |
Argonaut Transaction | Florida Canyon Gold |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Non-controlling interest in acquiree recognised at acquisition date |  |  |  |  |  |  | $ 10
Percentage of voting equity interests acquired | 19.99% |  |  |  |  |  |
Ordinary shares | Argonaut Transaction |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Number of shares issued in business combination (in shares) | shares |  | 20,400,000 |  |  |  |  |
Ordinary shares | Argonaut Transaction | Class A Common |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Exchange ratio (in shares) | shares | 0.0185 |  |  |  |  |  |
Ordinary shares | Argonaut Transaction | Common Share |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Exchange ratio (in shares) | shares | 0.1 |  |  |  |  |  |

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