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Accounting policies - Schedule of Reconciliation about operating lease obligations (Detail) - GBP (£)
£ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of initial application of standards or interpretations [line items]      
Operating lease commitments   £ 3,628.2  
Short-term and low value leases not included in lease liabilities   (73.8)  
Extension options reasonably certain to be exercised   115.1  
Signed leases not yet commenced   (598.1)  
Gross lease liabilities £ 3,002.5    
Effect of discounting (752.8)    
Lease liabilities £ 2,249.7    
Impact on Initial Application of IFRS16 [member]      
Disclosure of initial application of standards or interpretations [line items]      
Gross lease liabilities   3,071.4  
Effect of discounting   (745.2)  
Lease liabilities   £ 2,326.2 £ 2,326.2