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Finance and investment income, finance costs and revaluation of financial instruments - Summary of Finance Income, Finance Costs and Revaluation of Financial Instruments (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement [Line Items]      
Income from equity investments £ 18.3 £ 15.4 £ 16.8
Net interest expense on pension plans 3.5 3.6 [1] 5.4 [1]
Interest expense related to lease liabilities 105.1    
Finance costs 359.1 279.1 261.9
Continuing Operation [member]      
Statement [Line Items]      
Income from equity investments 18.3 15.2 [1] 16.7 [1]
Interest income 80.7 83.7 [1] 72.3 [1]
Finance income 99.0 98.9 [1] 89.0 [1]
Net interest expense on pension plans 3.5 3.6 [1] 5.4 [1]
Interest on other long-term employee benefits 3.9 3.5 [1] 3.3 [1]
Interest expense and similar charges [2] 252.0 272.0 [1] 253.2 [1]
Interest expense related to lease liabilities 99.7    
Finance costs 359.1 279.1 [1] 261.9 [1]
Movements in fair value of treasury instruments 0.4 (11.0) [1] 0.4 [1]
Premium on the early repayment of bonds (63.4)    
Revaluation of investments held at fair value through profit or loss 9.1 67.8 [1]  
Revaluation of put options over non-controlling interests (13.5) 34.4 [1] 51.4 [1]
Revaluation of payments due to vendors (earnout agreements) (1.0) 78.2 [1] 192.1 [1]
Revaluation of financial instruments £ (68.4) £ 169.4 [1] £ 243.9 [1]
[1] Prior year figures have been re-presented in accordance with IFRS 5 Non-current Assets Held for Sale and Discontinued Operations, as described in the accounting policies.
[2] Interest expense and similar charges are payable on bank overdrafts, bonds and bank loans held at amortised cost.