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Trade and Other Payables - Summary of Trade and Other Payables (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
 [1]
Trade and other payables [abstract]    
Trade payables $ 190.8 $ 169.3
Accruals and other payables 238.8 199.6
Payroll payables 51.7 46.3
Copper derivative contracts 3.3 0.0
Leave pay accrual 42.5 37.7
Interest payable on loans 10.2 9.7
Deferred consideration 11.2 67.7
Stamp duty payable 0.0 13.0
Total trade and other payables $ 548.5 $ 543.3
[1] As Restated - Refer note 40 for further details.