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Trade and Other Receivables - Schedule of Trade and Other Receivables (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
 [1]
Trade and other receivables [abstract]    
Trade receivables - gold sales and copper concentrate $ 23.6 $ 15.3
Trade receivables - other 18.1 16.5
Oil derivatives contracts (2018: Gold, copper and oil) 1.1 8.3
Receivables due from the sale of Tarkwa mining fleet 26.5 26.5
Deposits 0.1 0.2
Payroll receivables 2.4 2.9
Prepayments 42.5 43.3
Value added tax and import duties 16.0 18.1
Diesel rebate 0.9 1.1
Other 5.9 6.4
Total trade and other receivables $ 137.1 $ 138.6
[1] Refer note 42.