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Trade and other receivables - Ageing of Trade Receivables and Other Financial Assets (Detail) - GBP (£)
£ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial assets [Line items]    
Financial assets £ 8,613.9 £ 8,390.1
Trade receivables [member]    
Disclosure of financial assets [Line items]    
Financial assets 8,062.2 7,889.7
Other financial assets [member]    
Disclosure of financial assets [Line items]    
Financial assets 551.7 500.4
0-30 days [member]    
Disclosure of financial assets [Line items]    
Financial assets 1,432.0 1,736.6
0-30 days [member] | Trade receivables [member]    
Disclosure of financial assets [Line items]    
Financial assets 1,370.7 1,629.6
0-30 days [member] | Other financial assets [member]    
Disclosure of financial assets [Line items]    
Financial assets 61.3 107.0
31-90 days [member]    
Disclosure of financial assets [Line items]    
Financial assets 563.3 583.6
31-90 days [member] | Trade receivables [member]    
Disclosure of financial assets [Line items]    
Financial assets 549.1 577.0
31-90 days [member] | Other financial assets [member]    
Disclosure of financial assets [Line items]    
Financial assets 14.2 6.6
91-180 days [member]    
Disclosure of financial assets [Line items]    
Financial assets 136.9 147.7
91-180 days [member] | Trade receivables [member]    
Disclosure of financial assets [Line items]    
Financial assets 128.3 143.0
91-180 days [member] | Other financial assets [member]    
Disclosure of financial assets [Line items]    
Financial assets 8.6 4.7
181 days - 1 year [member]    
Disclosure of financial assets [Line items]    
Financial assets 83.3 59.1
181 days - 1 year [member] | Trade receivables [member]    
Disclosure of financial assets [Line items]    
Financial assets 75.6 48.8
181 days - 1 year [member] | Other financial assets [member]    
Disclosure of financial assets [Line items]    
Financial assets 7.7 10.3
Over 1 year [member]    
Disclosure of financial assets [Line items]    
Financial assets 99.8 65.3
Over 1 year [member] | Trade receivables [member]    
Disclosure of financial assets [Line items]    
Financial assets 64.8 24.7
Over 1 year [member] | Other financial assets [member]    
Disclosure of financial assets [Line items]    
Financial assets 35.0 40.6
Neither past due nor impaired [member]    
Disclosure of financial assets [Line items]    
Financial assets 6,298.6 5,797.8
Neither past due nor impaired [member] | Trade receivables [member]    
Disclosure of financial assets [Line items]    
Financial assets 5,873.7 5,466.6
Neither past due nor impaired [member] | Other financial assets [member]    
Disclosure of financial assets [Line items]    
Financial assets £ 424.9 £ 331.2