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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
Investment
Dec. 31, 2011
Investment
Jun. 30, 2010
Investment
Schedule of Investments [Line Items]      
Fair value $ 124.4 [1] $ 77.3 [1] $ 76.8 [1]
Cost 82.5 68.4 68.3
Net unrealized gain 41.9 8.9 8.5
The net gain comprises:      
Gross unrealized gains 42.3 15.2 10.9
Gross unrealized losses (0.4) (6.3) (2.4)
Net unrealized gain 41.9 8.9 8.5
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 3 8 4
Realized gain/(loss) reclassified from equity on disposal of listed investments (0.4) 6.6 99.2
Rusoro Mining Limited
      
The net gain comprises:      
Ownership % 26.40% 26.40% 26.40%
Description of business   Gold mining  
Market value of equity investment 51.3 13.2 31.1
Rand Refinery Limited
      
The net gain comprises:      
Ownership % 34.90% 34.90% 34.90%
Description of business   Refining of gold bullion and by-products  
Market value of equity investment    [2]    [2]    [2]
Timpetra Resources Limited
      
The net gain comprises:      
Ownership %   21.80%  
Description of business   Resource exploration  
Market value of equity investment   $ 1.2  
Evolution Mining Limited
      
Schedule of Investments [Line Items]      
Listed investments, Market value, $ per share   $ 1.62  
Listed investments, Number of shares   15,535,016  
GoldQuest Mining Corporation
      
Schedule of Investments [Line Items]      
Listed investments, Market value, $ per share $ 0.39 $ 0.08 $ 0.11
Listed investments, Number of shares 13,962,500 13,962,500 13,962,500
Northam Platinum
      
Schedule of Investments [Line Items]      
Listed investments, Market value, $ per share   $ 3.75  
Listed investments, Number of shares   7,820,169  
Atacama Pacific Corp
      
Schedule of Investments [Line Items]      
Listed investments, Market value, $ per share $ 3.22 $ 3.79  
Listed investments, Number of shares 4,945,598 4,945,598  
Gran Columbia Gold Corporation
      
Schedule of Investments [Line Items]      
Listed investments, Market value, $ per share   $ 0.40  
Listed investments, Number of shares   1,585,274  
Medoro Resources Limited
      
Schedule of Investments [Line Items]      
Listed investments, Market value, $ per share $ 2.30   $ 0.69
Listed investments, Number of shares 1,321,062   3,963,186
Mvelaphanda Resources Limited
      
Schedule of Investments [Line Items]      
Listed investments, Market value, $ per share $ 7.29 [3]   $ 6.16 [3]
Listed investments, Number of shares 8,397,858 [3]   8,397,858 [3]
Shares subject to scrip lending agreement 3,000,000    
Gold One International Limited
      
Schedule of Investments [Line Items]      
Listed investments, Market value, $ per share $ 0.33   $ 0.26
Listed investments, Number of shares 12,500,000   12,500,000
Conquest Mining Limited
      
Schedule of Investments [Line Items]      
Listed investments, Market value, $ per share $ 0.58   $ 0.30
Listed investments, Number of shares 51,783,388   51,783,388
[1] Listed investments mainly consist of: December 31, 2011 December 31, 2010 June 30, 2010 Number of shares Market value, $ per share Number of shares Market value, $ per share Number of shares Market value, $ per share Evolution Mining Limited 15,535,016 1.62 - - - - GoldQuest Mining Corporation 13,962,500 0.08 13,962,500 0.39 13,962,500 0.11 Northam Platinum 7,820,169 3.75 - - - - Atacama Pacific Gold Corporation 4,945,598 3.79 4,945,598 3.22 - - Gran Columbia Gold Corporation 1,585,274 0.40 - - - - Medoro Resources Limited - - 1,321,062 2.30 3,963,186 0.69 Mvelaphanda Resources Limited (1) - - 8,397,858 7.29 8,397,858 6.16 Gold One International Limited - - 12,500,000 0.33 12,500,000 0.26 Conquest Mining Limited - - 51,783,388 0.58 51,783,388 0.30 (1) Three million of the Mvelaphanda Resources Limited, or Mvelapanda, shares were subject to a scrip lending agreement at December 31, 2010 - see note 13 (e). Details of the listed investments are as follows: December 31, 2011 December 31, 2010 June 30, 2010 Fair value 77.3 124.4 76.8 Cost 68.4 82.5 68.3 Net unrealized gain 8.9 41.9 8.5 The net gain comprises: Gross unrealized gains 15.2 42.3 10.9 Gross unrealized losses (6.3 ) (0.4 ) (2.4 ) 8.9 41.9 8.5 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. : 8 3 4 Realized gain/(loss) reclassified from equity on disposal of listed investments ($ million) 6.6 (0.4 ) 99.2
[2] Not readily determinable
[3] Three million of the Mvelaphanda Resources Limited, or Mvelapanda, shares were subject to a scrip lending agreement at December 31, 2010 - see note 13 (e).