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Trade and Other Payables - Summary of Trade and Other Payables (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
 [1]
Dec. 31, 2017
Trade and other payables [abstract]      
Trade payables $ 138.1 $ 60.4 $ 105.4
Accruals and other payables 195.4 236.7 238.8
Payroll payables 36.8 44.3 51.7
Gold and foreign exchange derivative contracts 127.6 22.6 3.3
Leave pay accrual 44.7 43.0 42.5
Interest payable on loans 11.5 10.5 10.2
Damang - contract termination 40.3   11.2
Total trade and other payables $ 594.4 $ 417.5 $ 463.1
[1] Refer note 42.