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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