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Finance and investment income, finance costs and revaluation and retranslation of financial instruments (Tables)
 12 Months Ended
Dec. 31, 2023
Analysis of income and expense [abstract]  
Summary of Finance and Investment Income, Finance Costs and Revaluation and retranslation of Financial Instruments
Finance and investment income includes:
202320222021
£m£m£m
Income from equity investments12.9 24.5 17.9 
Interest income114.4 120.9 51.5 
127.3 145.4 69.4 
Finance costs include:
202320222021
£m£m£m
Net interest expense on pension plans4.3 2.2 1.8 
Interest on other long-term employee benefits6.0 3.7 2.4 
Interest expense and similar charges1
272.4 257.8 188.5 
Interest expense related to lease liabilities106.3 95.7 90.9 
389.0 359.4 283.6 
Note
1Interest expense and similar charges are payable on bank overdrafts, bonds and bank loans held at amortised cost.
Revaluation and retranslation of financial instruments include:
202320222021
£m£m£m
Movements in fair value of treasury instruments(3.1)0.5 9.1 
Premium on the early repayment of bonds— — (13.0)
Revaluation of investments and other assets held at fair value through profit or loss
(20.9)23.1 (7.5)
Remeasurement of put options over non-controlling interests
(1.5)27.9 (40.6)
Revaluation of payments due to vendors (earnout agreements)50.8 26.2 (58.7)
Retranslation of financial instruments(18.5)(1.7)22.9 
6.8 76.0 (87.8)