Rm   Share capital   Share premium   Preference shares2   Other reserves   Retained profit   Total
                           
  Balance as at December 2013    2.2    743.3      17.5    1,443.3    2,206.3
  Total comprehensive income          0.3    1,321.0    1,321.3
  Profit for the year            1,321.0    1,321.0
  Other comprehensive income for the year          0.3      0.3
  Share trust loss            (27.4)    (27.4)
  Dividends paid            (914.0)    (914.0)
  Treasury shares (note 10 and note 11)      (9.9)      (0.3)      (10.2)
  Share-based payment expense (note 11)          2.9      2.9
                           
  Balance as at December 2014    2.2    733.4      20.4    1,822.9    2,578.9
  Total comprehensive income          (0.1)    742.2    742.1
  Profit for the year            742.2    742.2
  Other comprehensive loss for the year          (0.1)      (0.1)
  Share trust loss            (23.6)    (23.6)
  Dividends paid              (914.1)    (914.1)
  Treasury shares (note 10 and note 11)      (58.3)      1.4      (56.9)
  Share-based payment expense (note 11)          13.8      13.8
                           
  Balance as at December 2015    2.2    675.1      35.5    1,627.4    2,340.2
                           
                      December 2015   December 2014
  Dividend per share (cents)                        
  – Interim                    146.0    146.0
  – Final1                    112.2    275.0
                       258.2    421.0
                           
  1Declared after the financial year-end.                
  2Value is less than R100,000.                        
  Details of the dividend can be found in note 11 in the Group Financial Statements.