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Investments - Schedule of investments (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule Of Investments [Line Items] |  |
Marketable equity securities | $ 35.5 | $ 57.7
Other investments | 0.1 | 1.8
Total investments | 35.6 | 59.5
Artemis Gold Inc. |  |
Schedule Of Investments [Line Items] |  |
Marketable equity securities | 24.0 | 40.3
Talisker Resources Ltd. |  |
Schedule Of Investments [Line Items] |  |
Marketable equity securities | 5.1 | 9.1
Other marketable securities |  |
Schedule Of Investments [Line Items] |  |
Marketable equity securities | $ 6.4 | $ 8.3

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