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Trade and Other Payables: Amounts Falling Due After More Than One Year - Summary of Contingent Consideration (Detail) - GBP (£) £ in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Disclosure Of Fair Value Of Contingent Consideration [abstract] |  |  |
At the beginning of the period | £ 414.7 | £ 630.7 | £ 630.7
Earnouts paid | (57.9) | (38.0) | (120.2)
New acquisitions | 3.9 | 11.9 | 48.6
Revision of estimates taken to goodwill | 1.1 | (26.3) | (68.3)
Revaluation of payments due to vendors (note 6) | 8.4 | (29.7) | (82.6)
Exchange adjustments | 1.3 | (5.7) | 6.5
At the end of the period | £ 371.5 | £ 542.9 | £ 414.7

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- Definition Disclosure Of Fair Value Of Contingent Consideration [abstract]. + 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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