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Employee Benefit Obligations - Surplus/(Deficit) in Plans by Region (Details) - GBP (£)
£ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of defined benefit plans [line items]      
Surplus (deficit) in plan £ (122.2) £ (122.1) £ (136.4)
United Kingdom      
Disclosure of defined benefit plans [line items]      
Surplus (deficit) in plan 0.7 2.3 0.4
North America      
Disclosure of defined benefit plans [line items]      
Surplus (deficit) in plan (29.7) (37.1) (28.1)
Western Continental Europe      
Disclosure of defined benefit plans [line items]      
Surplus (deficit) in plan (60.1) (52.6) (74.0)
Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe      
Disclosure of defined benefit plans [line items]      
Surplus (deficit) in plan £ (33.1) £ (34.7) £ (34.7)