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Deferred tax - Movements of Major Gross Deferred Tax Assets (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance £ 322.1  
Ending balance 324.4 £ 322.1
Gross deferred tax assets    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 588.8 565.0
Acquisition of subsidiaries 0.0 1.1
(Charge)/credit to income 25.8 (35.0)
Charge to other comprehensive income 1.5 (7.0)
Charge to equity (0.3) (15.5)
Exchange differences and other movements (24.9) 80.2
Ending balance 590.9 588.8
Gross deferred tax assets | Deferred compensation    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 74.3 108.5
Acquisition of subsidiaries 0.0 0.0
(Charge)/credit to income (6.0) (38.7)
Charge to other comprehensive income 0.0 0.0
Charge to equity 0.0 0.0
Exchange differences and other movements (3.2) 4.5
Ending balance 65.1 74.3
Gross deferred tax assets | Accounting provisions and accruals    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 120.1 106.2
Acquisition of subsidiaries 0.0 0.0
(Charge)/credit to income 13.8 3.3
Charge to other comprehensive income 0.0 0.0
Charge to equity 0.0 0.0
Exchange differences and other movements (2.2) 10.6
Ending balance 131.7 120.1
Gross deferred tax assets | Retirement benefit obligations    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 48.0 53.4
Acquisition of subsidiaries 0.0 0.0
(Charge)/credit to income 2.8 (2.9)
Charge to other comprehensive income 1.5 (7.0)
Charge to equity 0.0 0.0
Exchange differences and other movements (2.6) 4.5
Ending balance 49.7 48.0
Gross deferred tax assets | Plant and equipment    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 47.9 15.0
Acquisition of subsidiaries 0.0 0.0
(Charge)/credit to income (11.8) (1.0)
Charge to other comprehensive income 0.0 0.0
Charge to equity 0.0 0.0
Exchange differences and other movements (0.3) 33.9
Ending balance 35.8 47.9
Gross deferred tax assets | Property    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 53.7 53.0
Acquisition of subsidiaries 0.0 0.0
(Charge)/credit to income (5.7) (9.0)
Charge to other comprehensive income 0.0 0.0
Charge to equity 0.0 0.0
Exchange differences and other movements 8.4 9.7
Ending balance 56.4 53.7
Gross deferred tax assets | Tax losses and credits    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 122.5 110.5
Acquisition of subsidiaries 0.0 0.0
(Charge)/credit to income (11.5) 5.0
Charge to other comprehensive income 0.0 0.0
Charge to equity 0.0 0.0
Exchange differences and other movements (6.8) 7.0
Ending balance 104.2 122.5
Gross deferred tax assets | Share- based payments    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 32.3 43.5
Acquisition of subsidiaries 0.0 0.0
(Charge)/credit to income 3.7 1.3
Charge to other comprehensive income 0.0 0.0
Charge to equity (0.3) (15.5)
Exchange differences and other movements (0.7) 3.0
Ending balance 35.0 32.3
Gross deferred tax assets | Restructuring provisions    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 84.6 61.1
Acquisition of subsidiaries 0.0 0.0
(Charge)/credit to income 38.7 21.2
Charge to other comprehensive income 0.0 0.0
Charge to equity 0.0 0.0
Exchange differences and other movements (15.7) 2.3
Ending balance 107.6 84.6
Gross deferred tax assets | Other temporary differences    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 5.4 13.8
Acquisition of subsidiaries 0.0 1.1
(Charge)/credit to income 1.8 (14.2)
Charge to other comprehensive income 0.0 0.0
Charge to equity 0.0 0.0
Exchange differences and other movements (1.8) 4.7
Ending balance £ 5.4 £ 5.4