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Receivables (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Product sale trade receivables $ 240.6 $ 169.7
Other trade receivables 32.8 23.7
Deposits 0.5 0.1
Value added tax 69.3 65.3
Interest receivable 0.4 0.4
Payroll debtors 11.3 12.6
Prepayments 138.9 [1] 198.0 [1]
Other 28.9 13.6
Receivables $ 522.7 $ 483.4
[1] Includes $7.0 million for the Bezant's Mankayan Project (December 31, 2011: $120.0 million for the FSE project and $7.0 for Bezant).