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Intangible assets - Movement of Goodwill (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reconciliation of changes in goodwill [line items]      
Beginning balance £ 13,202.8 £ 12,952.9  
Impairment on classification as held for sale [1] 94.5    
Impairment losses for the year 47.7 183.9 [2] £ 27.1 [2]
Ending balance 10,170.7 13,202.8 12,952.9
Cost [member]      
Disclosure of reconciliation of changes in goodwill [line items]      
Beginning balance 14,129.5 13,675.3  
Additions 8.5 154.4  
Revision of earnout estimates (14.3) (68.3)  
Disposals (18.6)    
Transfer to disposal group classified as held for sale (2,729.1)    
Exchange adjustments (419.9) 368.1  
Ending balance 10,956.1 14,129.5 13,675.3
Accumulated impairment losses and write-downs [member]      
Disclosure of reconciliation of changes in goodwill [line items]      
Beginning balance 926.7 722.4  
Impairment on classification as held for sale 70.9    
Impairment losses for the year 47.7 183.9  
Transfer to disposal group classified as held for sale (230.6)    
Exchange adjustments (29.3) 20.4  
Ending balance £ 785.4 £ 926.7 £ 722.4
[1] Goodwill impairment of £94.5 million arose from the assessment of fair value less costs to sell under IFRS 5.
[2] Prior year figures have been re-presented in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations, as described in the accounting policies.