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Other Expenses - Summary of Other Expenses (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Components Of Other Expense [Line Items]      
Stamp duty and other costs on the acquisition of the Yilgarn South assets   $ 27.4us-gaap_AcquisitionCosts  
Facility charges   23.5gfi_FacilityCharges [1]  
Regulatory legal fees 7.1gfi_RegulatoryLegalFees [2] 11.1gfi_RegulatoryLegalFees [2]  
Other 37.1us-gaap_OtherNonoperatingExpense 42.2us-gaap_OtherNonoperatingExpense 37.9us-gaap_OtherNonoperatingExpense
Total other costs $ 44.2us-gaap_OtherNonoperatingIncomeExpense $ 104.2us-gaap_OtherNonoperatingIncomeExpense $ 37.9us-gaap_OtherNonoperatingIncomeExpense
[1] Facility charges on cancellation of the $1 billion and $500 million facilities associated with the spin-off of Sibanye Gold in fiscal 2013.
[2] Legal fees paid as a result of the Gold Fields Board examination and regulatory investigation relating to the South Deep Black Economic Empowerment transaction.