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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 [1] £ 143.4 £ 149.1  
Payments due to vendors, Non-current [2] 100.3 251.7  
Payments due to vendors 243.7 [2] 400.8 [2] £ 584.5
Within one year [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Current [2] 143.4 149.1  
Between one and two years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Non-current [2] 36.3 140.0  
Between two and three years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Non-current [2] 34.6 36.6  
Between three and four years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Non-current [2] 12.3 44.0  
Between four and five years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Non-current [2] 7.7 17.1  
Over five years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line items]      
Payments due to vendors, Non-current [2] £ 9.4 £ 14.0  
[1] Figures have been restated to be in accordance with IAS 39 Financial Instruments: Recognition and Measurement, as described in the accounting policies of the consolidated financial statements.
[2] Figures have been restated to be in accordance with IAS 39 Financial Instruments: Recognition and Measurement, as described in the accounting policies.