Equity attributable   Non-    
    Share   Share   Other   Retained   to owners   controlling    
Rm   capital   premium   reserves   profit   of the parent   interests   Total
                             
Balance as at December 2018 (Audited)   2.2   139.1   729.6   5,416.0   6,286.9   14.6   6,301.5
Dividends declared     174.3     (302.6)   (128.3)   (32.6)   (160.9)
Total comprehensive income       (68.8)   (1,307.5)   (1,376.3)   11.1   (1,365.2)
Changes in non-controlling interests       0.5     0.5   22.2   22.7
IFRS 2 charge and treasury shares acquired     (103.6)   102.4   3.9   2.7     2.7
Balance as at December 2019 (Audited)   2.2   209.8   763.7   3,809.8   4,785.5   15.3   4,800.8
Dividends declared             (4.0)   (4.0)
Total comprehensive income       33.0   (1,161.1)   (1,128.1)   (5.7)   (1,133.8)
Changes in non-controlling interests             (0.2)   (0.2)
IFRS 2 charge and treasury shares acquired     (68.8)   39.8   1.4   (27.6)     (27.6)
                             
Balance as at June 2020 (Reviewed)   2.2   141.0   836.5   2,650.1   3,629.8   5.4   3,635.2
                             
Balance as at December 2018 (Audited)   2.2   139.1   729.6   5,416.0   6,286.9   14.6   6,301.5
Issue of share capital     174.3       174.3     174.3
Dividends declared         (302.6)   (302.6)   (4.2)   (306.8)
Total comprehensive income       (40.1)   (836.1)   (876.2)   3.7   (872.5)
Changes in non-controlling interests       0.5     0.5   (1.2)   (0.7)
IFRS 2 charge and treasury shares acquired     (36.3)   20.3   0.5   (15.5)     (15.5)
                             
Balance as at June 2019 (Reviewed)   2.2   277.1   710.3   4,277.8   5,267.4   12.9   5,280.3