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Other reserves - Translation Reserve Comprises (Details) - GBP (£)
£ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of reserves within equity [line items]        
Total equity £ 3,832.7 £ 4,160.4 £ 4,069.0 £ 5,050.1
Translation reserve        
Disclosure of reserves within equity [line items]        
Total equity 229.9 526.6 227.2 £ 307.1
Balance relating to continuing net investment hedges        
Disclosure of reserves within equity [line items]        
Total equity (53.1) (143.8) (2.3)  
Balance relating to discontinued net investment hedges        
Disclosure of reserves within equity [line items]        
Total equity (67.5) (85.0) (85.0)  
Balance related to foreign exchange differences on translation of foreign operations        
Disclosure of reserves within equity [line items]        
Total equity £ 350.5 £ 755.4 £ 314.5