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Trade and Other Receivables - Schedule of Trade and Other Receivables (Detail) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Trade And Other Receivables [Line Items]    
Deposits $ 0.0 $ 0.1
Payroll receivables 5.3 9.3
Prepayments 66.3 108.2
Value Added Tax and import duties 53.4 62.9
Diesel rebate 1.2 1.0
Other 16.0 5.6
Trade and other receivables 198.0 263.7
Gold sales    
Disclosure Of Trade And Other Receivables [Line Items]    
Trade receivables 18.7 44.1
Copper concentrate    
Disclosure Of Trade And Other Receivables [Line Items]    
Trade receivables 29.6 25.8
Other    
Disclosure Of Trade And Other Receivables [Line Items]    
Trade receivables $ 7.5 $ 6.7