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Taxation - Tax Charge Reconciled to Profit Before Taxation (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Major components of tax expense (income) [abstract]      
Profit before taxation £ 346.3 £ 1,159.8 £ 950.8
Tax at the corporation rate of 19.0% 81.4 220.4 180.7
Tax effect of (earnings)/losses from associates (15.0) 17.4 (13.3)
Irrecoverable withholding taxes 34.8 25.9 52.3
Tax effect of items that are not deductible in determining taxable profits 39.0 66.7 29.3
Tax effect of non-deductible goodwill impairment 16.2 7.2 0.6
Effect of different tax rates in subsidiaries operating in other jurisdictions 41.8 94.3 81.2
Origination and reversal of unrecognised temporary differences 8.8 (1.1) (36.3)
Tax losses not recognised or utilised in the year 44.0 9.8 7.4
Utilisation of tax losses not previously recognised (15.3) (5.4) (5.1)
Net release of prior year provisions in relation to acquired businesses (3.9) (2.8) (1.1)
Other prior year adjustments (82.7) (48.0) (41.8)
Impact of deferred tax rate change 0.0 0.0 (23.8)
Tax charge £ 149.1 £ 384.4 £ 230.1
Effective tax rate on profit before tax 43.10% 33.10% 24.20%