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Deferred tax - Analysis of Deferred Tax Balances for Financial Reporting Purposes (Details) - GBP (£)
£ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [abstract]    
Deferred tax assets gross £ 684.9 £ 734.2
Deferred tax liabilities gross (539.0) (762.9)
Net deferred tax assets 145.9  
Net deferred tax liabilities   (28.7)
Gross of balances arising from a single transaction (94.0) (145.4)
Gross of balances arising from a single transaction 94.0 145.4
Gross of balances arising from a single transaction 0.0 0.0
Gross balances before offset within countries 590.9 588.8
Gross balances before offset within countries (445.0) (617.5)
Gross balances before offset within countries 145.9 (28.7)
Deferred tax assets, offset (266.5) (266.7)
Deferred tax liabilities, offset 266.5 266.7
Offset, net 0.0 0.0
Deferred tax assets 324.4 322.1
Deferred tax liabilities £ (178.5) £ (350.8)