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Investments (Details) $ in Millions, $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2023 USD ($) | Jan. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Schedule Of Investments [Line Items] |  |  |  |
Marketable equity securities |  |  | $ 7.0 | $ 35.5
Other investments |  |  | 0.1 | 0.1
Total investments |  |  | 7.1 | 35.6
Proceeds from sales of investments other than investments accounted for using equity method | $ 23.4 | $ 31.5 |  |
Artemis Gold Inc. |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Marketable equity securities |  |  | 0.0 | 24.0
Talisker Resources Ltd. |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Marketable equity securities |  |  | 2.5 | 5.1
Other marketable securities |  |  |  |
Schedule Of Investments [Line Items] |  |  |  |
Marketable equity securities |  |  | $ 4.5 | $ 6.4

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