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Carrying Value of Equity Investment in Rusoro (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2010
Schedule of Equity Method Investments [Line Items]        
Opening balance   $ 28.2 [1]    
Share of losses recognized 4.9 (51.7) 4.0 (22.7)
Impairment     (6.8)  
Other comprehensive income       0.8
Closing balance   254.4 [1] 28.2 [1]  
Rusoro Mining Limited
        
Schedule of Equity Method Investments [Line Items]        
Opening balance   13.2 20.0  
Share of losses recognized   (13.4) [2]    
Impairment     (6.8)  
Other comprehensive income   0.2    
Closing balance     $ 13.2  
[1] Equity investees comprise the following: Ownership % Market value Investment Description of business December 31, 2012 December 31, 2011 December 31, 2012 December 31, 2011 Far South East Exploration 40.0 - * * Rusoro Mining Limited Gold mining 26.4 26.4 6.3 13.1 Rand Refinery Limited Refining of gold bullion and by-products 34.9 34.9 * * Timpetra Resources Limited Resource exploration 21.8 21.8 1.0 1.2
[2] The results of Rusoro for the Gold Fields' fiscal year ended December 31, 2012 are for the twelve months to September 2012 (December 31, 2011: nine months ended September 30, 2011).