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Finance and investment income, finance costs and revaluation and retranslation of financial instruments - Summary of Finance Income, Finance Costs and Revaluation and Retranslation of Financial Instruments (Detail) - GBP (£)
£ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Statement [Line Items]    
Income from equity investments £ 5.0 £ 6.8 [1]
Finance income 30.1 51.2 [1]
Finance costs 147.2 157.3 [1]
Revaluation and Retranslation of Financial Instruments (12.1) (268.6) [1]
Continuing Operations [member]    
Statement [Line Items]    
Income from equity investments 5.0 6.8
Interest income 25.1 44.4
Finance income 30.1 51.2
Interest expense and similar charges 101.5 107.1
Interest expense related to lease liabilities 45.7 50.2
Finance costs 147.2 157.3
Movements in fair value of treasury instruments 4.7 (2.0) [1]
Premium on the early repayment of bonds  
Revaluation of investments held at fair value through profit or loss 30.5 1.7 [1]
Revaluation of put options over non-controlling interests (44.4) 25.4 [1]
Revaluation of payments due to vendors (earnout agreements) (9.4) 7.4 [1]
Retranslation of financial instruments 19.6 (301.1) [1]
Revaluation and Retranslation of Financial Instruments £ (12.1) £ (268.6) [1]
[1] Figures have been restated as described in the accounting policies.