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Declaration of Dividends (Tables)
 6 Months Ended
Jun. 30, 2012
Dividends [Abstract]  
Shedule Of Dividend [Text Block]
             
  Details of the final dividends of 2011 and interim dividends of 2012 are set forth in the table below: 
             
   Ordinary shareholders E ordinary shareholders 
   Final dividendInterim dividends Final dividendInterim dividends 
   20112012 2012 20112012 2012 
             
  Declaration dateFeb 14, 2012May 8, 2012 Aug 3, 2012 Feb 14, 2012May 8, 2012 Aug 3, 2012 
  Record dateMar 9, 2012Jun 1, 2012 Aug 31, 2012 Mar 9, 2012Jun 1, 2012 Aug 31, 2012 
  Payment date - Ordinary / E ordinary shareholdersMar 16, 2012Jun 8, 2012 Sep 14, 2012 Mar 16, 2012Jun 8, 2012 Sep 14, 2012 
  Payment date - CDIsMar 16, 2012Jun 8, 2012 Sep 14, 2012 -- - 
  Payment date - GhDSsMar 19, 2012Jun 11, 2012 Sep 17, 2012  (1)-- - 
  Payment date - ADSsMar 26, 2012Jun 18, 2012 Sep 24, 2012  (1)-- - 
             
  Dividend amount per share - declared (US cents) 26.401 11.806  12.000  (2) 13.201 5.903  6.000  (2)
             
  Dividend amount per share - declared (South African cents) 200.0 100.0  100.0  100.0 50.0  50.0 
             
  Dividend amount per share - paid (US cents) 26.401 10.035  (3) 10.200 (2)(3) 13.201 5.018  (3) 5.100 (2)(3)
  Dividend amount per share - paid (South African cents) 200.0 85.0  (3) 85.0  (3) 100.0 42.5  (3) 42.5  (3)
             
  (1) Approximate payment date.          
             
  (2) Approximate amount.          
             
  (3) Net of 15 percent withholding tax.          
             
  During the third quarter of 2011, the Company changed its frequency of dividend payments to quarterly rather than half-yearly. 
             
  Withholding tax on dividends and other distributions to shareholders of 15 percent became effective on April 1, 2012. The withholding tax, which was announced by the South African government on February 21, 2007, replaces the Secondary Tax on Companies. 
             
  Dividends are declared in South African cents. Dollar cents per share figures have been calculated based on exchange rates prevailing on each of the respective payment dates. 
             
  In addition to the cash dividend, an amount equal to the dividend paid to holders of E ordinary shares will be offset when calculating the strike price of E ordinary shares. 
             
  Each CDI represents one-fifth of an ordinary share and 100 GhDSs represents one ordinary share. Each ADS represents one ordinary share.