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Costs of services and general and administrative costs - Summary of Operating Lease (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Information About Operating Cost [line items]      
Operating lease rentals, net of sublease income £ 570.5 £ 580.6 £ 555.1
Land and buildings [member]      
Disclosure Of Information About Operating Cost [line items]      
Land and buildings 585.3 586.6 556.1
Sublease income (25.4) (17.9) (11.6)
Operating lease rentals, net of sublease income 559.9 568.7 544.5
Plant and machinery [member]      
Disclosure Of Information About Operating Cost [line items]      
Land and buildings £ 10.6 £ 11.9 £ 10.6