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Sources of finance - Summary of Equity and Debt Financing (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Analysis of changes in financing      
Beginning balance £ 9,806.6 £ 9,956.1 £ 9,761.7
Ordinary shares issued 0.6 1.2 6.4
Share cancellations (47.7)    
End of year 8,443.5 9,806.6 9,956.1
Analysis of changes in financing      
Beginning of year 6,217.9    
Net decrease in drawings on bank loans and corporate bonds (1,713.2) (440.6) 599.6
End of year 4,272.9 6,217.9  
Issued capital and share premium [member]      
Analysis of changes in financing      
Beginning balance 703.0 701.8  
Ordinary shares issued 0.6 1.2  
Share cancellations (0.5)    
End of year 703.1 703.0 701.8
Debt financing [member]      
Analysis of changes in financing      
Beginning of year 6,217.9 6,481.3  
Net decrease in drawings on bank loans and corporate bonds (1,713.2) (440.6)  
Amortisation of financing costs included in debt 10.3 7.7  
Changes in fair value due to hedging arrangements 14.3 (9.9)  
Other movements 1.5 (0.2)  
Exchange adjustments (257.9) 179.6  
End of year £ 4,272.9 £ 6,217.9 £ 6,481.3