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Trade and other payables - Summary of Trade and Other Payables, Amounts Falling Due After More Than One Year (Detail) - GBP (£)
£ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Trade and other non-current payables [abstract]      
Payments due to vendors (earnout agreements) £ 203.9 £ 266.5 £ 349.2
Liabilities in respect of put option agreements with vendors 223.0 205.2 211.2
Fair value of derivatives   14.2 30.4
Other creditors and accruals 140.8 355.5 347.0
Trade and other payables £ 567.7 £ 841.4 £ 937.8