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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 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Line Items      
Income from equity investments [1] £ 6.8 £ 9.3 £ 18.3
Interest expense related to lease liabilities [1] 48.6 51.7 105.1
Revaluation of financial instruments (301.1) 8.9 245.7
Continuing Operation [member]      
Line Items      
Income from equity investments 6.8 9.3 18.3
Interest income 44.4 32.5 80.7
Finance income 51.2 41.8 99.0
Net interest expense on pension plans 1.4 1.8 3.5
Interest on other long-term employee benefits 1.4 1.8 3.9
Interest payable and similar charges 104.3 127.8 252.0
Interest expense related to lease liabilities 50.2 48.7 99.7
Finance costs 157.3 180.1 359.1
Movements in fair value of treasury instruments (2.0) 7.3 0.4
Premium on the early repayment of bonds   (32.2) (63.4)
Revaluation of investments held at fair value through profit or loss 1.7 1.6 9.1
Revaluation of put options over non-controlling interests 25.4 (14.6) (24.3)
Revaluation of payments due to vendors (earnout agreements) 7.4 (2.4) (3.7)
Revaluation of financial instruments (301.1) 8.9 245.7
Gain Loss On Revaluation And Retranslation Of Financial Instruments £ (268.6) £ (31.4) £ 163.8
[1] Figures have been restated as described in the accounting policies.