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Leases - Summary of Maturity of Lease Liabilities (Details) - GBP (£)
£ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Leases [Line Items]      
Gross lease liabilities £ 2,772.2 £ 2,825.4  
Effect of discounting (617.7) (614.8)  
Lease liability at end of year 2,154.5 2,210.6 £ 2,041.8
Short-term lease liability 292.3 282.4  
Long-term lease liability 1,862.2 1,928.2  
Within one year      
Disclosure Of Leases [Line Items]      
Gross lease liabilities 405.9 379.1  
Between one and two years      
Disclosure Of Leases [Line Items]      
Gross lease liabilities 326.9 337.7  
Between two and three years      
Disclosure Of Leases [Line Items]      
Gross lease liabilities 282.1 293.0  
Between three and four years      
Disclosure Of Leases [Line Items]      
Gross lease liabilities 261.0 252.3  
Between four and five years      
Disclosure Of Leases [Line Items]      
Gross lease liabilities 231.1 234.8  
Over five years      
Disclosure Of Leases [Line Items]      
Gross lease liabilities £ 1,265.2 £ 1,328.5