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Finance and investment income, finance costs and revaluation and retranslation of financial instruments (Detail) - GBP (£)
£ in Millions
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Finance and investment income, finance costs and revaluation and retranslation of financial instruments [Abstract]    
Income from equity investments £ 20.1 £ 5.0
Interest income 35.4 25.1
Finance income 55.5 30.1
Interest payable and similar charges 98.9 101.5
Interest expense related to lease liabilities 46.0 45.7
Finance costs 144.9 147.2
Movements in fair value of treasury instruments 1.9 4.7
Premium on the early repayment of bonds 0.0 (13.1)
Revaluation of investments held at fair value through profit or loss 9.0 30.5
Revaluation of put options over non-controlling interests 19.6 (44.4)
Revaluation of payments due to vendors (earnout agreements) (1.1) (9.4)
Retranslation of financial instruments 3.7 19.6
Revaluation and retranslation of financial instruments £ 33.1 £ (12.1)