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Reconciliation of profit before interest and taxation to headline PBIT (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Reconciliation of Profit Before Interest and Taxation to Headline PBIT
     2018
£m		     2017
£m		     2016
£m		  
Profit before interest and taxation      1,474.9       2,021.7       2,112.9  
Amortisation and impairment of acquired intangible assets      280.0       195.1       168.4  
Goodwill impairment      183.9       27.1       27.0  
Gains on disposal of investments and subsidiaries    (235.5)     (129.0)     (44.3)  
(Gains)/losses on remeasurement of equity interests arising from a change in scope of ownership      (2.0 )      0.3       (232.4 ) 
Investment write-downs      2.0       95.9       86.1  
Restructuring and transformation costs      302.3       56.8       27.4  
Share of exceptional losses/(gains) of associates      41.7       (0.8 )      15.2  
Headline PBIT      2,047.3       2,267.1       2,160.3