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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 | £ 414.7 | £ 630.7
Earnouts paid | (130.0) | (120.2)
New acquisitions | 9.6 | 48.6
Revision of estimates taken to goodwill (note 14) | (14.3) | (68.3)
Revaluation of payments due to vendors | 1.1 | (82.6)
Transfer to disposal group classified as held for sale | (11.5) | 0.0
Exchange adjustments | (15.8) | 6.5
At end of year | £ 253.8 | £ 414.7

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- Definition Increase (decrease) through business combinations, 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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