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Unaudited Condensed Consolidated Interim Statement of Comprehensive Income - GBP (£)
£ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2017
Statement of comprehensive income [abstract]        
Profit for the period £ 705.5 £ 1,278.6 £ 633.7 [1] £ 1,912.3 [1]
Items that may be reclassified subsequently to profit or loss:        
Exchange adjustments on foreign currency net investments (176.7) (207.4) (257.8) (465.2)
(Loss)/gain on revaluation of available for sale investments   32.5 (0.4) 32.1
Items that may be reclassified subsequently to profit or loss (176.7)   (258.2) (433.1)
Items that will not be reclassified subsequently to profit or loss:        
Actuarial gain on defined benefit pension plans   17.0   17.0
Deferred tax on defined benefit pension plans   (24.6)   (24.6)
Fair value movements on equity investments (140.5)      
Items that will not be reclassified subsequently to profit or loss (140.5)     (7.6)
Other comprehensive (loss)/income (317.2) £ (182.5) (258.2) (440.7)
Total comprehensive income for the period 388.3   375.5 1,471.6
Attributable to:        
Equity holders of the parent 353.8   348.0 1,395.6
Non-controlling interests 34.5   27.5 76.0
Total comprehensive income for the period £ 388.3   £ 375.5 £ 1,471.6
[1] Prior year figures have been restated for the impact of the adoption of IFRS 15: Revenue from Contracts with Customers and the change in income statement presentation, as described in note 2.