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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
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement [Line Items]      
Income from equity investments [1] £ 18.3 £ 15.4 £ 16.8
Net interest expense on pension plans 3.5 3.6 [2] 5.4 [2]
Interest expense related to lease liabilities [1] 105.1    
Finance costs [1] 359.1 279.1 [2] 261.9 [2]
Revaluation and retranslation of financial instruments [3] 163.8 (76.3) [2] 391.0 [2]
Continuing Operations [member]      
Statement [Line Items]      
Income from equity investments 18.3 15.2 [2] 16.7 [2]
Interest income 80.7 83.7 [2] 72.3 [2]
Finance income 99.0 98.9 [2] 89.0 [2]
Net interest expense on pension plans 3.5 3.6 [2] 5.4 [2]
Interest on other long-term employee benefits 3.9 3.5 [2] 3.3 [2]
Interest expense and similar charges [4] 252.0 272.0 [2] 253.2 [2]
Interest expense related to lease liabilities [4] 99.7    
Finance costs 359.1 279.1 [2] 261.9 [2]
Movements in fair value of treasury instruments [3] 0.4 (11.0) [2] 0.4 [2]
Premium on the early repayment of bonds [3] (63.4)    
Revaluation of investments held at fair value through profit or loss [3] 9.1 67.8 [2]  
Revaluation of put options over non-controlling interests [3] (24.3) 25.9 [2] 39.5 [2]
Revaluation of payments due to vendors (earnout agreements) [3] (3.7) 46.1 [2] 156.5 [2]
Revaluation and retranslation of financial instruments [3] £ 245.7 £ (205.1) [2] £ 194.6 [2]
[1] Figures have been restated, as described in the accounting policies.
[2] 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.
[3] Figures have been restated to be in accordance with IAS 39 Financial Instruments: Recognition and Measurement, as described in the accounting policies.
[4] Interest expense and similar charges are payable on bank overdrafts, bonds and bank loans held at amortised cost.