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Equity-Accounted Investees - FSE (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of equity-accounted investees [line items]    
Investment - current year $ 0.0 $ (113.6)
Investment in joint ventures 538.6 72.5
Far Southeast Gold Resources Incorporated (“FSE”)    
Disclosure of equity-accounted investees [line items]    
Unlisted shares at cost 230.0 230.0
Equity contribution 99.1 97.8
Impairment – prior years (230.0) (116.4)
Share of accumulated losses brought forward (97.8) (96.8)
Share of loss after taxation (1.3) (1.0)
Investment in joint ventures $ 0.0 $ 0.0