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Trade and other payables - Payments Due to Vendors (Detail) - GBP (£)
£ in Millions
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]        
Payments due to vendors, Current £ 65.4 £ 142.4 £ 167.6  
Payments due to vendors, Non-current 101.2 111.4 203.9  
Payments due to vendors 166.6 253.8 371.5 £ 414.7
Within one year [member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]        
Payments due to vendors, Current 65.4 142.4 167.6  
Between one and two years [member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]        
Payments due to vendors, Non-current 26.1 36.9 90.0  
Between two and three years [member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]        
Payments due to vendors, Non-current 15.5 37.5 44.1  
Between three and four years [member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]        
Payments due to vendors, Non-current 28.1 14.8 36.9  
Between four and five years [member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]        
Payments due to vendors, Non-current 27.8 9.7 22.4  
Over five years [member]        
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]        
Payments due to vendors, Non-current £ 3.7 £ 12.5 £ 10.5