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Costs of services and general and administrative costs - Auditor's Remuneration (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Information About Operating Cost [line items]      
Other services pursuant to legislation £ 4.2 £ 4.0 £ 3.7
Fees payable to the auditors pursuant to legislation 27.3 26.1 24.5
Total non-audit fees 4.8 4.8 8.7
Total fees 32.1 30.9 33.2
Advisory services [member]      
Disclosure Of Information About Operating Cost [line items]      
Auditors' remuneration for tax services   0.1 1.6
Compliance services [member]      
Disclosure Of Information About Operating Cost [line items]      
Auditors' remuneration for tax services 0.1 0.1 1.3
Corporate finance services [member]      
Disclosure Of Information About Operating Cost [line items]      
Other services pursuant to legislation     0.1
Other services [member]      
Disclosure Of Information About Operating Cost [line items]      
Other services pursuant to legislation 4.7 4.6 5.7
WPP plc [member]      
Disclosure Of Information About Operating Cost [line items]      
Auditors' remuneration for audit services 1.4 1.4 1.4
Subsidiaries [member]      
Disclosure Of Information About Operating Cost [line items]      
Auditors' remuneration for audit services £ 21.7 £ 20.7 £ 19.4