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Accounting policies - Additional Information (Restatement) (Detail) - GBP (£)
£ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Jan. 01, 2020
Disclosure of Restatements [Line Items]        
Retained earnings £ 4,952.1   £ 5,070.7  
Other reserves (43.4)   196.0  
Goodwill impairment charge £ 2,812.9 [1]    
Revaluation and retranslation of financial instruments (12.1) (268.6) [1]    
Deferred tax liabilities £ (329.9)   £ (304.1)  
Financial Statement Impact of Restatements [member]        
Disclosure of Restatements [Line Items]        
Gain (loss) recognised in revaluation and retranslation on financial instruments   (301.1)    
Retained earnings   87.3   £ 271.7
Other reserves   59.6    
Goodwill impairment charge   328.2    
Revaluation and retranslation of financial instruments   2.5    
Impairment of right of use asset and other assets   5.1    
Deferred tax credit   13.1    
Deferred tax liabilities   (13.1)    
Decrease in goodwill impairment charge   £ (36.1)    
[1] Figures have been restated as described in the accounting policies.