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Trade and other receivables - Ageing of Trade Receivables and Other Financial Assets (Detail) - GBP (£)
£ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets [Line items]    
Financial assets £ 7,590.1 £ 8,613.9
Trade receivables [member]    
Disclosure of financial assets [Line items]    
Financial assets 7,007.6 8,062.2
Other financial assets [member]    
Disclosure of financial assets [Line items]    
Financial assets 582.5 551.7
0-30 days [member]    
Disclosure of financial assets [Line items]    
Financial assets 1,064.8 1,432.0
0-30 days [member] | Trade receivables [member]    
Disclosure of financial assets [Line items]    
Financial assets 934.9 1,370.7
0-30 days [member] | Other financial assets [member]    
Disclosure of financial assets [Line items]    
Financial assets 129.9 61.3
31-90 days [member]    
Disclosure of financial assets [Line items]    
Financial assets 389.3 563.3
31-90 days [member] | Trade receivables [member]    
Disclosure of financial assets [Line items]    
Financial assets 341.0 549.1
31-90 days [member] | Other financial assets [member]    
Disclosure of financial assets [Line items]    
Financial assets 48.3 14.2
91-180 days [member]    
Disclosure of financial assets [Line items]    
Financial assets 108.3 136.9
91-180 days [member] | Trade receivables [member]    
Disclosure of financial assets [Line items]    
Financial assets 92.1 128.3
91-180 days [member] | Other financial assets [member]    
Disclosure of financial assets [Line items]    
Financial assets 16.2 8.6
181 days - 1 year [member]    
Disclosure of financial assets [Line items]    
Financial assets 27.6 83.3
181 days - 1 year [member] | Trade receivables [member]    
Disclosure of financial assets [Line items]    
Financial assets 22.4 75.6
181 days - 1 year [member] | Other financial assets [member]    
Disclosure of financial assets [Line items]    
Financial assets 5.2 7.7
Over 1 year [member]    
Disclosure of financial assets [Line items]    
Financial assets 89.2 99.8
Over 1 year [member] | Trade receivables [member]    
Disclosure of financial assets [Line items]    
Financial assets 63.9 64.8
Over 1 year [member] | Other financial assets [member]    
Disclosure of financial assets [Line items]    
Financial assets 25.3 35.0
Not past due [member]    
Disclosure of financial assets [Line items]    
Financial assets 5,910.9 6,298.6
Not past due [member] | Trade receivables [member]    
Disclosure of financial assets [Line items]    
Financial assets 5,553.3 5,873.7
Not past due [member] | Other financial assets [member]    
Disclosure of financial assets [Line items]    
Financial assets £ 357.6 £ 424.9