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Sources of finance - Summary of Equity and Debt Financing (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Analysis of changes in financing      
Beginning balance £ 4,160.4 £ 4,069.0 £ 5,050.1
Ordinary shares issued 0.7 1.2 4.4
Share cancellations   807.4 729.3
Ending balance 3,832.7 4,160.4 4,069.0
Analysis of changes in financing      
Borrowings, beginning balance 4,465.1 4,441.7  
Acquisition of subsidiaries 28.3 (38.7)  
Borrowings, ending balance 4,363.1 4,465.1 4,441.7
Issued capital and share premium      
Analysis of changes in financing      
Beginning balance 690.0 697.1 699.9
Ordinary shares issued 0.7 1.2 4.4
Share cancellations 0.0 (8.3) (7.2)
Ending balance 690.7 690.0 697.1
Debt financing      
Analysis of changes in financing      
Borrowings, beginning balance 4,465.1 4,441.7 5,032.7
Net decrease in drawings on bank loans and bonds (48.9) (220.6) (397.1)
Amortisation of financing costs included in debt 0.2 7.0 8.1
Acquisition of subsidiaries 48.9 0.0 0.0
Changes in fair value due to hedging arrangements 0.0 0.0 (2.5)
Other movements (3.5) (0.2) (0.4)
Exchange adjustments (98.7) 237.2 (199.1)
Borrowings, ending balance £ 4,363.1 £ 4,465.1 £ 4,441.7