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Unaudited Condensed Consolidated Interim Statement of Changes in Equity - GBP (£) £ in Millions | Total | Called-up share capital [member] | Share premium account [member] | Other reserves [member] | Own shares [member] | Retained earnings [member] | [1] | Total equity share owner's funds [member] | Non-controlling interests [member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2016 |  | £ 9,761.7 |  | £ 133.2 | £ 562.2 | £ 1,185.2 | £ (962.0) | £ 8,400.0 | £ 9,318.6 | £ 443.1
Ordinary shares issued |  | 4.1 |  |  | 4.1 |  |  |  | 4.1 |
Treasury share additions |  | (144.9) |  |  |  |  | (144.9) |  | (144.9) |
Treasury share allocations |  |  |  |  |  |  | 0.7 | (0.7) |  |
Profit for the period |  | 633.7 | [2] |  |  |  |  | 596.1 | 596.1 | 37.6
Exchange adjustments on foreign currency net investments |  | (257.8) |  |  |  | (247.7) |  |  | (247.7) | (10.1)
Gain/(loss) on revaluation of available for sale investments |  | (0.4) |  |  |  | (0.4) |  |  | (0.4) |
Other comprehensive (loss)/income |  | (258.2) |  |  |  | (248.1) |  |  | (248.1) | (10.1)
Dividends paid |  | (46.3) |  |  |  |  |  |  |  | (46.3)
Non-cash share-based incentive plans (including share options) |  | 50.6 |  |  |  |  |  | 50.6 | 50.6 |
Tax adjustments on share-based payments |  | 8.4 |  |  |  |  |  | 8.4 | 8.4 |
Net movement in own shares held by ESOP Trusts |  | (145.3) |  |  |  |  | (15.4) | (129.9) | (145.3) |
Recognition/remeasurement of financial instruments |  | 12.5 |  |  |  | 15.0 |  | (2.5) | 12.5 |
Acquisition of subsidiaries | [3] | (25.6) |  |  |  |  |  | (38.6) | (38.6) | 13.0
Ending balance at Jun. 30, 2017 |  | 9,850.7 | [4] | 133.2 | 566.3 | 952.1 | (1,121.6) | 8,883.4 | 9,413.4 | 437.3
Beginning balance at Dec. 31, 2016 |  | 9,761.7 |  | 133.2 | 562.2 | 1,185.2 | (962.0) | 8,400.0 | 9,318.6 | 443.1
Treasury share additions |  | (289.6) |  |  |  |  |  |  |  |
Profit for the period | [2] | 1,912.3 |  |  |  |  |  |  |  |
Exchange adjustments on foreign currency net investments |  | (465.2) |  |  |  |  |  |  |  |
Gain/(loss) on revaluation of available for sale investments |  | 32.1 |  |  |  |  |  |  |  |
Actuarial gain on defined benefit pension plans |  | 17.0 |  |  |  |  |  |  |  |
Deferred tax on defined benefit pension plans |  | (24.6) |  |  |  |  |  |  |  |
Other comprehensive (loss)/income |  | (440.7) |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2017 |  | 9,956.1 | [4] | 133.3 | 568.5 | 761.7 | (1,171.1) | 9,194.9 | 9,487.3 | 468.8
Beginning balance at Jun. 30, 2017 |  | 9,850.7 | [4] | 133.2 | 566.3 | 952.1 | (1,121.6) | 8,883.4 | 9,413.4 | 437.3
Ordinary shares issued |  | 2.3 |  | 0.1 | 2.2 |  |  |  | 2.3 |
Treasury share additions |  | (144.7) |  |  |  |  | (144.7) |  | (144.7) |
Treasury share allocations |  |  |  |  |  |  | 111.5 | (111.5) |  |
Profit for the period |  | 1,278.6 |  |  |  |  |  | 1,220.5 | 1,220.5 | 58.1
Exchange adjustments on foreign currency net investments |  | (207.4) |  |  |  | (197.8) |  |  | (197.8) | (9.6)
Gain/(loss) on revaluation of available for sale investments |  | 32.5 |  |  |  | 32.5 |  |  | 32.5 |
Actuarial gain on defined benefit pension plans |  | 17.0 |  |  |  |  |  | 17.0 | 17.0 |
Deferred tax on defined benefit pension plans |  | (24.6) |  |  |  |  |  | (24.6) | (24.6) |
Other comprehensive (loss)/income |  | (182.5) |  |  |  | (165.3) |  | (7.6) | (172.9) | (9.6)
Dividends paid |  | (793.0) |  |  |  |  |  | (751.5) | (751.5) | (41.5)
Non-cash share-based incentive plans (including share options) |  | 54.4 |  |  |  |  |  | 54.4 | 54.4 |
Tax adjustments on share-based payments |  | (5.4) |  |  |  |  |  | (5.4) | (5.4) |
Net movement in own shares held by ESOP Trusts |  | (69.3) |  |  |  |  | (16.3) | (53.0) | (69.3) |
Recognition/remeasurement of financial instruments |  | (34.3) |  |  |  | (25.1) |  | (9.2) | (34.3) |
Acquisition of subsidiaries | [3] | (0.7) |  |  |  |  |  | (25.2) | (25.2) | 24.5
Ending balance at Dec. 31, 2017 |  | 9,956.1 | [4] | 133.3 | 568.5 | 761.7 | (1,171.1) | 9,194.9 | 9,487.3 | 468.8
Accounting policy change (IFRS 9) |  |  |  |  |  | (407.4) |  | 407.4 |  |
Beginning balance, revised at Dec. 31, 2017 |  | 9,956.1 |  | 133.3 | 568.5 | 354.3 | (1,171.1) | 9,602.3 | 9,487.3 | 468.8
Ordinary shares issued |  | 0.9 |  |  | 0.9 |  |  |  | 0.9 |
Treasury share additions |  | (104.3) |  |  |  |  | (104.3) |  | (104.3) |
Treasury share allocations |  |  |  |  |  |  | 1.3 | (1.3) |  |
Profit for the period |  | 705.5 |  |  |  |  |  | 672.4 | 672.4 | 33.1
Exchange adjustments on foreign currency net investments |  | (176.7) |  |  |  | (178.1) |  |  | (178.1) | 1.4
Fair value movements on equity investments |  | (140.5) |  |  |  |  |  | (140.5) | (140.5) |
Other comprehensive (loss)/income |  | (317.2) |  |  |  | (178.1) |  | (140.5) | (318.6) | 1.4
Dividends paid |  | (65.8) |  |  |  |  |  |  |  | (65.8)
Non-cash share-based incentive plans (including share options) |  | 41.6 |  |  |  |  |  | 41.6 | 41.6 |
Tax adjustments on share-based payments |  | 0.3 |  |  |  |  |  | 0.3 | 0.3 |
Net movement in own shares held by ESOP Trusts |  | (96.5) |  |  |  |  | (10.3) | (86.2) | (96.5) |
Recognition/remeasurement of financial instruments |  | (30.1) |  |  |  | (34.8) |  | 4.7 | (30.1) |
Acquisition of subsidiaries | [3] | (97.0) |  |  |  |  |  | (74.5) | (74.5) | (22.5)
Ending balance at Jun. 30, 2018 |  | £ 9,993.5 |  | £ 133.3 | £ 569.4 | £ 141.4 | £ (1,284.4) | £ 10,018.8 | £ 9,578.5 | £ 415.0
[1] | Retained earnings have been restated for the impact of the adoption of IFRS 15: Revenue from Contracts with Customers, as described in note 2.
[2] | Prior year figures have been restated for the impact of the adoption of IFRS 15: Revenue from Contracts with Customers and the change in income statement presentation, as described in note 2.
[3] | Acquisition of subsidiaries represents movements in retained earnings and non-controlling interests arising from changes in ownership of existing subsidiaries and recognition of non-controlling interests on new acquisitions.
[4] | Prior year figures have been restated for the impact of the adoption of IFRS 15: Revenue from Contracts with Customers, as described in note 2.

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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase (decrease) due to the adoption of IFRS 9. + References No definition available. + Details
Name: | wpp_IncreaseDecreaseDueToTheAdoptionOfIFRS9
Namespace Prefix: | wpp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in equity resulting from net movement in own shares held by ESOP Trusts. + References No definition available. + Details
Name: | wpp_NetMovementInOwnSharesHeldByEsopTrusts
Namespace Prefix: | wpp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) in equity resulting from the recognition/remeasurement of financial instruments. + References No definition available. + Details
Name: | wpp_RecognitionRemeasurementsOfFinancialInstruments
Namespace Prefix: | wpp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Stockholders' equity adjusted balance. + References No definition available. + Details
Name: | wpp_StockholdersEquityAdjustedBalance
Namespace Prefix: | wpp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant