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Receivables (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Product sale trade receivables $ 68.1 $ 86.4
Other trade receivables 3.6 14.0
Deposits 0.2 0.3
Value added tax 43.2 39.9
Payroll debtors 7.2 8.2
Prepayments 40.5 64.2
Other 6.1 13.5
Receivables $ 168.9 $ 226.5