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Trade and Other Payables Amounts Falling Due After More than One Year - Summary of Contingent Consideration (Detail) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Fair Value Of Contingent Consideration [abstract] |  |  |  |
At the beginning of the year |  | £ 400.8 | [1] | £ 584.5
Earnouts paid |  | (130.0) |  | (120.2)
New acquisitions |  | 9.6 |  | 48.6
Revision of estimates taken to goodwill (note 14) |  | (14.1) |  | (67.6)
Revaluation of payments due to vendors |  | 3.8 |  | (50.5)
Transfer to disposal group classified as held for sale |  | (11.5) |  | 0.0
Exchange adjustments |  | (14.9) |  | 6.0
At end of year | [1] | £ 243.7 |  | £ 400.8
[1] | Figures have been restated to be in accordance with IAS 39 Financial Instruments: Recognition and Measurement, as described in the accounting policies.

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- Definition Contingent consideration current and non-current payable to vendors (earnout agreements). + References No definition available. + Details
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- Definition Disclosure Of Fair Value Of Contingent Consideration [abstract]. + References No definition available. + Details
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- Definition Earnouts paid. + References No definition available. + Details
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- Definition Increase (decrease) through business combinations, contingent consideration. + References No definition available. + Details
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- Definition Increase (decrease) through net exchange differences, contingent consideration. + References No definition available. + Details
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- Definition Revaluation of payments due to vendors, Increase decrease in payables + References No definition available. + Details
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- Definition Revision of estimates taken to goodwill. + References No definition available. + Details
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- Definition Transfer to disposal group classified as held for sale from trade and other payables. + References No definition available. + Details
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