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Investments (Details) $ in Millions, $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2021 USD ($) | Apr. 30, 2021 CAD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2021 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Schedule Of Investments [Line Items] |  |  |  |  |  |
Marketable equity securities |  |  |  |  | $ 57.7 | $ 44.5
Other investments |  |  |  |  | 1.8 | 0.9
Total investments |  |  |  |  | 59.5 | 45.4
Artemis Gold Inc. |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Marketable equity securities |  |  |  |  | 40.3 | 37.2
Talisker Resources Ltd. |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Marketable equity securities |  |  |  |  | 9.1 | 0.0
Percentage of investment acquisition | 14.90% | 14.90% |  |  |  |
Payment for investment | $ 11.0 | $ 13.8 |  |  |  |
Other Marketable Securities |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Marketable equity securities |  |  |  |  | $ 8.3 | $ 7.3
Harte Gold Corp |  |  |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |  |  |
Percentage of investment acquisition |  |  | 14.90% | 14.90% |  |
Payment for investment |  |  | $ 19.8 | $ 24.8 |  |

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