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Authorised and issued share capital - Additional Information (Detail) £ / shares in Units, £ in Millions | 12 Months Ended
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Dec. 31, 2019 GBP (£) shares ADRs yr £ / shares $ / ADRs | Dec. 31, 2018 GBP (£) £ / shares $ / ADRs shares | Dec. 31, 2017 £ / shares $ / ADRs
Disclosure of classes of share capital [line items] |  |  |
Share option granted in Life | yr | 10 |  |
WPP Share Option Plan 2015 [member] | Bottom of range [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Threshold period for employment participation in employee stock ownership plan | 2 years |  |
WPP Worldwide Share Ownership Program [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Vesting period | 3 years |  |
WPP Worldwide Share Ownership Program [member] | Bottom of range [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Threshold period for employment participation in employee stock ownership plan | 2 years |  |
Executive Stock Option Plan [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Vesting period | 3 years |  |
Share option performance effect | Nine years and eight months |  |
Ordinary shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of the ordinary shares of the Company held by the ESOP | 9,219,837 | 14,820,994 |
Market value of the ordinary shares of the Company held by the ESOP | £ | £ 98.3 | £ 125.5 |
Number of ordinary shares held in treasury | 70,787,730 | 70,854,553 |
Ordinary shares held in Treasury at market value | £ | £ 755.0 | £ 599.9 |
Average share price | £ / shares | £ 9.39 | £ 11.56 | £ 15.86
Ordinary shares [member] | WPP Share Option Plan 2015 [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of ordinary shares under option | 13,413,425 |  |
Ordinary shares [member] | WPP Executive Share Option Scheme [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of ordinary shares under option | 6,741 |  |
Ordinary shares [member] | WPP Worldwide Share Ownership Program [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Number of ordinary shares under option | 2,757,654 |  |
American depository receipts [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Average ADR Price | $ / ADRs | 59.93 | 77.31 | 101.86
American depository receipts [member] | WPP Share Option Plan 2015 [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Unexercised options | ADRs | 1,396,745 |  |
American depository receipts [member] | WPP Worldwide Share Ownership Program [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Unexercised options | ADRs | 388,854 |  |
Share purchase options [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Unrecognised compensation costs related to share options | £ | £ 7.3 | £ 8.5 |
Unrecognised compensation cost related to share options, weighted average period | 19 months | 20 months |

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