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Trade and Other Payables - Summary of Trade and Other Payables (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Trade and other payables [abstract]      
Trade payables $ 145.9 $ 190.8 $ 0.0
Accruals and other payables 236.7 238.8 0.0
Payroll payables 44.3 51.7 0.0
Gold, copper and foreign exchange derivative contracts1 22.6 3.3 0.0
Leave pay accrual 43.0 42.5 0.0
Interest payable on loans 10.5 10.2 0.0
Deferred consideration - refer note 16.2 0.0 11.2 0.0
Total trade and other payables $ 503.0 $ 548.5 $ 0.0