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Receivables (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Product sale trade receivables $ 110.9 $ 240.6
Other trade receivables 16.7 32.8
Deposits 5.1 0.5
Value added tax 57.7 69.3
Interest receivable   0.4
Payroll debtors 3.7 11.3
Prepayments 68.2 [1] 138.9 [1]
Other 10.3 28.9
Receivables $ 272.6 $ 522.7
[1] In 2012, prepayments included $7.0 milllion for the Bezant's Mankayan Project.