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Trade and other payables - Payments Due to Vendors (Detail) - GBP (£)
£ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Current £ 148.2 £ 180.7  
Payments due to vendors, Non-current 266.5 450.0  
Payments due to vendors 414.7 630.7 £ 976.5
Within one year [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Current 148.2 180.7  
Between one and two years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Non-current 140.2 128.3  
Between two and three years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Non-current 38.5 144.1  
Between three and four years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Non-current 50.3 58.3  
Between four and five years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Non-current 20.4 103.1  
Over five years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Non-current £ 17.1 £ 16.2