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Leases - Summary of Movement in Right of use Assets and Lease Liabilities (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Leases [Line Items]      
Beginning balance, right-of-use assets £ 1,528.5 £ 1,395.1  
Additions 304.6 387.6  
Transfers to net investment in subleases (4.6) (7.0)  
Disposals (10.3) (43.0)  
Depreciation of right-of-use assets (256.8) (262.2) £ (272.9)
Impairment charges included within restructuring costs (128.8) (33.5) (12.5)
Exchange adjustments (50.4) 91.5  
Ending balance, right-of-use assets 1,382.2 1,528.5 1,395.1
Right of use assets that meet the definition of an investment property 20.8 18.5  
Lease liabilities, beginning balance 2,210.6 2,041.8  
Additions 287.9 377.3  
Interest expense related to lease liabilities 106.3 95.7 90.9
Disposals (13.1) (48.0)  
Repayment of lease liabilities (including interest) (361.6) (402.0)  
Exchange adjustments (75.6) 145.8  
Lease liabilities, ending balance 2,154.5 2,210.6 2,041.8
Land and buildings      
Disclosure Of Leases [Line Items]      
Beginning balance, right-of-use assets 1,482.2 1,357.0  
Additions 255.0 363.8  
Transfers to net investment in subleases (4.6) (7.0)  
Disposals (9.2) (42.2)  
Depreciation of right-of-use assets (235.9) (245.3) (254.7)
Impairment charges included within restructuring costs (128.8) (33.3)  
Exchange adjustments (49.1) 89.2  
Ending balance, right-of-use assets 1,309.6 1,482.2 1,357.0
Lease liabilities, beginning balance 2,162.2 2,002.5  
Additions 237.7 353.6  
Interest expense related to lease liabilities 103.4 94.2  
Disposals (11.4) (46.1)  
Repayment of lease liabilities (including interest) (340.0) (385.6)  
Exchange adjustments (74.1) 143.6  
Lease liabilities, ending balance 2,077.8 2,162.2 2,002.5
Plant and machinery      
Disclosure Of Leases [Line Items]      
Beginning balance, right-of-use assets 46.3 38.1  
Additions 49.6 23.8  
Transfers to net investment in subleases 0.0 0.0  
Disposals (1.1) (0.8)  
Depreciation of right-of-use assets (20.9) (16.9) (18.2)
Impairment charges included within restructuring costs 0.0 (0.2)  
Exchange adjustments (1.3) 2.3  
Ending balance, right-of-use assets 72.6 46.3 38.1
Lease liabilities, beginning balance 48.4 39.3  
Additions 50.2 23.7  
Interest expense related to lease liabilities 2.9 1.5  
Disposals (1.7) (1.9)  
Repayment of lease liabilities (including interest) (21.6) (16.4)  
Exchange adjustments (1.5) 2.2  
Lease liabilities, ending balance £ 76.7 £ 48.4 £ 39.3