Rm   Share
capital
  Share
premium
  Other
reserves
  Retained
profit
  Equity
attributable
to owners
of the parent
  Non-
controlling
interests
  Total
                             
Balance as at December 2017 (Audited)   2.2   401.2   452.7   5,478.1   6,334.2   43.2   6,377.4
Dividends declared         (735.6)   (735.6)   (8.4)   (744.0)
Total comprehensive income – restated       103.9   888.6   992.5   (19.9)   972.6
Changes in non-controlling interests         0.3   0.3   (0.3)  
IFRS 2 charge and Share Trust transactions     (221.1)   173.0   11.7   (36.4)     (36.4)
Treasury shares acquired     (41.0)       (41.0)     (41.0)
Balance as at December 2018 (Audited)   2.2   139.1   729.6   5,643.1   6,514.0   14.6   6,528.6
Effect of adoption of new accounting standard (IFRS 16)*         (227.1)   (227.1)     (227.1)
Balance at December 2018 (Reviewed) Restated   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 Share Trust transactions     (78.0)   20.3   0.5   (57.2)     (57.2)
Treasury shares acquired     41.7       41.7     41.7
                             
Balance as at June 2019 (Reviewed)   2.2   277.1   710.3   4,277.8   5,267.4   12.9   5,280.3
                             
                             
Balance as at December 2017 (Audited) as previously stated   2.2   401.2   452.7   5,478.1   6,334.2   43.2   6,377.4
Dividends declared         (588.5)   (588.5)   (8.4)   (596.9)
Total comprehensive income       127.2   195.7   322.9   (5.7)   317.2
Changes in non-controlling interests             0.6   0.6
IFRS 2 charge and Share Trust transactions       90.8   10.7   101.5     101.5
Treasury shares acquired     (178.0)       (178.0)     (178.0)
                             
Balance as at June 2018 (Reviewed)   2.2   223.2   670.7   5,096.0   5,992.1   29.7   6,021.8
                             
* Refer to note 2.