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Trade and other payables - Payments Due to Vendors (Detail) - GBP (£)
£ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Current £ 142.4 £ 148.2  
Payments due to vendors, Non-current 111.4 266.5  
Payments due to vendors 253.8 414.7 £ 630.7
Within one year [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Current 142.4 148.2  
Between one and two years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Non-current 36.9 140.2  
Between two and three years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Non-current 37.5 38.5  
Between three and four years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Non-current 14.8 50.3  
Between four and five years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Non-current 9.7 20.4  
Over five years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Non-current £ 12.5 £ 17.1