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Costs of services and general and administrative costs - Auditor's Remuneration (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Information About Operating Cost [line items]      
Other services £ 5.0 £ 4.2 £ 4.0
Fees payable to the auditors pursuant to legislation 34.5 30.8 26.1
Total non-audit fees 8.2 4.8 4.8
Total fees 42.7 35.6 30.9
Advisory services [member]      
Disclosure Of Information About Operating Cost [line items]      
Auditors' remuneration for tax services 0.0   0.1
Compliance services [member]      
Disclosure Of Information About Operating Cost [line items]      
Auditors' remuneration for tax services 0.0 0.1 0.1
Other services [member]      
Disclosure Of Information About Operating Cost [line items]      
Other services [1] 8.2 4.7 4.6
WPP plc [member]      
Disclosure Of Information About Operating Cost [line items]      
Auditors' remuneration for audit services 1.5 1.4 1.4
Subsidiaries [member]      
Disclosure Of Information About Operating Cost [line items]      
Auditors' remuneration for audit services £ 28.0 £ 25.2 [1] £ 20.7
[1] Includes a true-up of £3.5 million.