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Trade and Other Receivables - Schedule of Trade and Other Receivables (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Trade and other receivables [abstract]    
Trade receivables - gold sales and copper concentrate $ 23.4 $ 46.6
Trade receivables - other 23.0 15.6
Gold, copper and oil derivative contracts 8.3 25.0
Receivables due from the sale of Tarkwa mining fleet 26.5 0.0
Deposits 0.2 0.1
Payroll receivables 2.9 11.6
Prepayments 43.3 51.5
Value added tax and import duties 18.1 45.9
Diesel rebate 1.1 1.4
Other 6.4 4.2
Total trade and other receivables $ 153.2 $ 201.9