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Consolidated Income Statement - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Profit or loss [abstract]      
Revenue [1],[2] £ 15,602.4 £ 15,804.2 £ 14,887.3
Costs of services (12,663.5) (12,629.0) [2] (11,846.5) [2]
Gross profit 2,938.9 3,175.2 [2] 3,040.8 [2]
General and administrative costs (1,507.5) (1,267.0) [2] (977.7) [2]
Operating profit 1,431.4 1,908.2 [2] 2,063.1 [2]
Share of results of associates 43.5 113.5 [2] 49.8 [2]
Profit before interest and taxation 1,474.9 2,021.7 [2] 2,112.9 [2]
Finance income 104.8 95.2 [2] 80.4 [2]
Finance costs (289.3) (269.8) [2] (254.5) [2]
Revaluation of financial instruments 172.9 262.2 [2] (48.3) [2]
Profit before taxation 1,463.3 2,109.3 [2] 1,890.5 [2]
Taxation (323.9) (197.0) [2] (388.9) [2]
Profit for the year 1,139.4 1,912.3 [2] 1,501.6 [2]
Attributable to:      
Equity holders of the parent 1,062.9 1,816.6 [2] 1,400.1 [2]
Non-controlling interests 76.5 95.7 [2] 101.5 [2]
Profit for the year £ 1,139.4 £ 1,912.3 [2] £ 1,501.6 [2]
Earnings per share      
Basic earnings per ordinary share £ 0.852 £ 1.440 [2] £ 1.096 [2]
Diluted earnings per ordinary share £ 0.843 £ 1.424 [2] £ 1.080 [2]
[1] Intersegment sales have not been separately disclosed as they are not material.
[2] Prior year figures have been restated for the impact of the adoption of IFRS 15 Revenue from Contracts with Customers, as described in the accounting policies.