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Trade and other receivables - Summary of Trade and Other Receivables, 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 receivables [abstract]      
Prepayments £ 2.8 £ 3.0 £ 4.2
Accrued income 22.8 16.5 21.8
Fair value of derivatives 6.3 8.4  
Other debtors 150.8 152.1 144.4
Trade and other receivables £ 182.7 £ 180.0 £ 170.4