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Accounting policies - Restatement - Additional Information (Detail) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of IAS 32 and IAS 39 Restatements [line items] |  |  |  |  |  |
Increase in cash and short term deposits and bank overdrafts, bonds and bank loans |  | £ 8,336.7 | £ 8,422.6 |  | £ 9,459.6 |
Revaluation and retranslation of financial instruments | [1] | 163.8 | (76.3) | [2] | 391.0 | [2]
Stockholders equity period increase decrease |  | 506.9 |  |  |  |
Increase decrease in fair value of liabilities of put option agreements with vendors current |  | 0.0 | 0.0 |  | 0.0 |
Increase decrease in other reserves liability |  | 0.0 | 0.0 |  | 0.0 |
Increase decrease in payments due to vendors (earnout agreements) |  | 0.0 | 0.0 |  | 0.0 |
Increase decrease in goodwill |  | 0.0 | 0.0 |  | 0.0 |
Increase decrease in goodwill impairment charges |  | 0.0 | 0.0 |  | 0.0 |
Exchange adjustments on foreign currency net investments [member] |  |  |  |  |  |
Disclosure of IAS 32 and IAS 39 Restatements [line items] |  |  |  |  |  |
Increase decrease in exchange adjustments on foreign currency net investment due to changes in other reserves |  | 0.0 | 0.0 |  | 0.0 |
Increase decrease in exchange adjustments on foreign currency net investment due to changes in goodwill |  | 0.0 | 0.0 |  | 0.0 |
Revaluation and retranslation of financial instruments [member] |  |  |  |  |  |
Disclosure of IAS 32 and IAS 39 Restatements [line items] |  |  |  |  |  |
Increase decrease in fair value of liabilities of put option agreements with vendors current |  | 0.0 | 0.0 |  | 0.0 |
Increase decrease in payments due to vendors (earnout agreements) |  | 0.0 | 0.0 |  | 0.0 |
Reclassification of exchange adjustments on foreign currency net investments [member] |  |  |  |  |  |
Disclosure of IAS 32 and IAS 39 Restatements [line items] |  |  |  |  |  |
Revaluation and retranslation of financial instruments |  | £ 245.7 | £ 205.1 |  | £ 194.6 |
[1] | Figures have been restated to be in accordance with IAS 39 Financial Instruments: Recognition and Measurement, as described in the accounting policies.
[2] | Prior year figures have been re-presented in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations, as described in the accounting policies.

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- Definition The increase (decrease) in other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2019-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2019-en-r&anchor=para_84&doctype=Standard -URIDate 2019-03-27 + Details
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