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Non-Current Investments (Parenthetical) (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 6 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2012
Investment
Dec. 31, 2011
Investment
Jun. 30, 2010
Schedule of Investments [Line Items]        
Fair value   $ 36.2 [1] $ 77.3 [1]  
Cost   24.8 68.4  
Net unrealized gain   11.4 8.9  
The net gain comprises:        
Gross unrealized gains   11.7 15.2  
Gross unrealized losses   (0.3) (6.3)  
Net unrealized gain   11.4 8.9  
The gross unrealized loss comprises the following number of equity instruments none of which have been in a continuous unrealized loss position for more than 12 months:   4 8  
Realized gain reclassified from equity on disposal of listed investments ($ million) (0.4) 14.7 12.8 111.7
Far Southeast (FSE) Deposit
        
The net gain comprises:        
Ownership %   40.00%    
Market value of equity investment      [2]    [2]  
Description of business   Exploration    
Rusoro Mining Limited
        
The net gain comprises:        
Ownership %   26.40% 26.40%  
Market value of equity investment   6.3 13.1  
Description of business   Gold mining    
Rand Refinery Limited
        
The net gain comprises:        
Ownership %   34.90% 34.90%  
Market value of equity investment      [2]    [2]  
Description of business   Refining of gold bullion and by-products    
Timpetra Resources Limited
        
The net gain comprises:        
Ownership %   21.80% 21.80%  
Market value of equity investment   $ 1.0 $ 1.2  
Description of business   Resource exploration    
Northam Platinum | Listed Investments
        
Schedule of Investments [Line Items]        
Listed investments, Market value, $ per share   $ 4.55 $ 3.75  
Listed investments, Number of shares   7,820,169 7,820,169  
Radius Gold Incorporated | Listed Investments
        
Schedule of Investments [Line Items]        
Listed investments, Market value, $ per share   $ 0.22 $ 0.23  
Listed investments, Number of shares   3,625,124 3,625,124  
Gran Columbia Gold Corporation | Listed Investments
        
Schedule of Investments [Line Items]        
Listed investments, Market value, $ per share   $ 0.36 $ 0.40  
Listed investments, Number of shares   1,585,274 1,585,274  
Evolution Mining Limited | Listed Investments
        
Schedule of Investments [Line Items]        
Listed investments, Market value, $ per share     $ 1.62  
Listed investments, Number of shares     15,535,016  
GoldQuest Mining Corporation | Listed Investments
        
Schedule of Investments [Line Items]        
Listed investments, Market value, $ per share     $ 0.08  
Listed investments, Number of shares     13,962,500  
Atacama Pacific Gold Corporation | Listed Investments
        
Schedule of Investments [Line Items]        
Listed investments, Market value, $ per share     $ 3.79  
Listed investments, Number of shares     4,945,598  
[1] Listed investments mainly consist of: December 31, 2012 December 31, 2011 Number of shares Market value, $ per share Number of shares Market value, $ per share Northam Platinum 7,820,169 4.55 7,820,169 3.75 Radius Gold Incorporated 3,625,124 0.22 3,625,124 0.23 Gran Columbia Gold Corporation 1,585,274 0.36 1,585,274 0.40 Evolution Mining Limited - - 15,535,016 1.62 GoldQuest Mining Corporation - - 13,962,500 0.08 Atacama Pacific Gold Corporation - - 4,945,598 3.79 Details of the listed investments are as follows: December 31, 2012 December 31, 2011 Fair value 36.2 77.3 Less: Cost 24.8 68.4 Net unrealized gain 11.4 8.9 The net gain comprises: Gross unrealized gains 11.7 15.2 Gross unrealized losses (0.3 ) (6.3 ) 11.4 8.9 The gross unrealized loss comprises the following number of equity instruments none of which have been in a continuous unrealized loss position for more than 12 months: 4 8 Realized gain reclassified from equity on disposal of listed investments ($ million) 14.7 12.8
[2] Not readily determinable