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Acquisition And Disposal Of Businesses - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 6 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2010
Dec. 31, 2011
Jun. 30, 2010
Jun. 30, 2009
Jun. 22, 2011
GHANA
Nov. 26, 2007
Essakane joint venture
Exploration Project or Asset
Oct. 11, 2007
Essakane joint venture
Exploration Project or Asset
Nov. 26, 2007
Orezone Resources Inc
Exploration Project or Asset
Jun. 22, 2011
IAMGold Corporation
GHANA
Jun. 21, 2010
IAMGold Corporation
GHANA
Jun. 30, 2009
IAMGold Corporation
Exploration Project or Asset
Sep. 30, 2010
Far Southeast (FSE) Deposit
Exploration Project or Asset
The Philippines
Sep. 30, 2011
Far Southeast (FSE) Deposit
Exploration Project or Asset
The Philippines
Liberty Express Assets
Sep. 30, 2010
Far Southeast (FSE) Deposit
Exploration Project or Asset
The Philippines
Liberty Express Assets
Sep. 30, 2010
Far Southeast (FSE) Deposit
Exploration Project or Asset
The Philippines
Lepanto Consolidated Mining Company
Dec. 31, 2011
Far Southeast (FSE) Deposit
Exploration Project or Asset
The Philippines
Lepanto Consolidated Mining Company
Mar. 22, 2012
Far Southeast (FSE) Deposit
Exploration Project or Asset
The Philippines
Acquisition
Dec. 31, 2011
Mankayan Project-Bezant Resources
Jun. 22, 2011
Damang
GHANA
Jun. 21, 2010
Damang
GHANA
Mar. 22, 2011
Gold Fields La Cima
Mar. 21, 2011
Gold Fields La Cima
Significant Acquisitions and Disposals [Line Items]                                            
Disposal of assets, cash consideration       $ 5.0   $ 152.0                                
Loss on disposal of subsidiary       (0.3)                                    
Percentage of ownership interest subject to acquisition or disposal agreement             60.00%   90.00% 71.10%   60.00%   40.00%   20.00%     90.00% 71.10%    
Minimum total consideration from selling equity investment             200                              
Disposal of assets, newly-issued shares received           41,666,667                                
Disposal of assets, newly-issued shares received, value           48                                
Share ownership percentage after disposal asset               12.20%                            
Orezone shares exchanged for shares                     3,300,000                      
Disposal of assets, newly-issued shares received, value 0.4 13.7 385.8 54.3             33.4                      
Gain (loss) on disposal of assets, newly-issued shares received (0.4) 12.8 111.7 (16.1)             7.2                      
Percentage of options in gold-copper Far Southeast (FSE) exercised                                 40.00%          
Business acquisition amount of cash consideration         667                       110          
Percentage to acquire undeveloped gold-copper Far Southeast (FSE) deposit under option agreement with Lepanto Consolidated Mining Company and Liberty Express Assets                       60.00%                    
Cash consideration paid for acquisition                       340       110         382  
Pre-agreed acquisition price for a 60% interest in FSE, option fees paid                             10.0              
Pre-agreed acquisition price for a 60% interest in FSE, initial non-refundable down payment                           44                
Pre-agreed acquisition price for a 60% interest in FSE, non-refundable down payment                         66                  
Pre-agreed acquisition price for a 60% interest in FSE                         220                  
Terms of option agreement to acquire undeveloped gold-copper Far Southeast (FSE) deposit                       The Liberty and Lepanto options were initially granted to Gold Fields for the later of 18 months from signature in September 2010 or the date of receiving a Financial or Technical Assistance Agreement, or FTAA, for the project. A FTAA licence allows a foreign corporation to control a majority interest in a Philippine mining project. Notwithstanding this provision, Gold Fields has the discretion to exercise either option prior to the FTAA being granted. The FTAA application for the FSE project was filed in November 2011 and based on the date of the filing Gold Fields expects it could be granted in the second half of 2012. Gold Fields also expects to have a maiden resource statement for FSE and commence a pre-feasibility study later this year.                    
Option purchased to acquire share capital of Asean, non-refundable fee paid                                   7.0        
Option purchased to acquire share capital of Asean, exercise price                                   $ 63.0        
Option purchased to acquire share capital of Asean, expiration date                                   Jan. 31, 2013        
Percentage of ownership interest acquired                 18.90%                   18.90%      
Ownership interest held by government of Ghana                 10.00%                   10.00%      
Percentage of effective economic interest                                         98.50% 80.70%