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Trade and other payables - Payments Due to Vendors (Detail) - GBP (£)
£ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]        
Payments due to vendors, Current £ 167.6 £ 148.2 £ 193.7  
Payments due to vendors, Non-current 203.9 266.5 349.2  
Payments due to vendors 371.5 414.7 542.9 £ 630.7
Within one year [member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]        
Payments due to vendors, Current 167.6 148.2 193.7  
Between one and two years [member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]        
Payments due to vendors, Non-current 90.0 140.2 131.4  
Between two and three years [member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]        
Payments due to vendors, Non-current 44.1 38.5 96.5  
Between three and four years [member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]        
Payments due to vendors, Non-current 36.9 50.3 61.3  
Between four and five years [member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]        
Payments due to vendors, Non-current 22.4 20.4 49.9  
Over five years [member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]        
Payments due to vendors, Non-current £ 10.5 £ 17.1 £ 10.1