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Accounting policies - IFRS 16 Implementation - Additional Information (Detail) - GBP (£)
£ / shares in Units, £ in Millions
 12 Months Ended
Jan. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of initial application of standards or interpretations [line items]        
Right-of-use assets   £ 1,734.5    
Lease liabilities   2,249.7    
Change in operating profit   £ 61.0    
Weighted average discount rate 5.40%      
Retained earnings £ 128.9      
Deferred tax assets 27.8      
Diluted earning per share   £ 0.495 £ 0.843 £ 1.424
Impact on Initial Application of IFRS16 [member]        
Disclosure of initial application of standards or interpretations [line items]        
Right-of-use assets 1,895.1   £ 1,895.1  
Lease liabilities 2,326.2   £ 2,326.2  
Reduction in other creditors 233.5      
Reduction in property provisions £ 68.7      
Diluted earning per share   £ (0.018)