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Employee Benefit Obligations - Funded and Unfunded Pension 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) £ (122.2) £ (122.1) £ (136.4)
Defined benefit obligation, at present value (381.2) (552.6) (688.5)
United Kingdom      
Disclosure of defined benefit plans [line items]      
Surplus (deficit) 0.7 2.3 0.4
North America      
Disclosure of defined benefit plans [line items]      
Surplus (deficit) (29.7) (37.1) (28.1)
Western Continental Europe      
Disclosure of defined benefit plans [line items]      
Surplus (deficit) (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) (33.1) (34.7) (34.7)
Funded plans by region      
Disclosure of defined benefit plans [line items]      
Surplus (deficit) (31.4) (26.8) (31.0)
Defined benefit obligation, at present value (290.3) (457.3) (583.1)
Funded plans by region | United Kingdom      
Disclosure of defined benefit plans [line items]      
Surplus (deficit) 0.7 2.3 0.4
Defined benefit obligation, at present value (9.2) (155.5) (231.9)
Funded plans by region | North America      
Disclosure of defined benefit plans [line items]      
Surplus (deficit) 7.4 4.1 20.1
Defined benefit obligation, at present value (182.9) (208.5) (237.9)
Funded plans by region | Western Continental Europe      
Disclosure of defined benefit plans [line items]      
Surplus (deficit) (34.1) (29.1) (45.1)
Defined benefit obligation, at present value (70.6) (67.9) (87.6)
Funded plans by region | Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe      
Disclosure of defined benefit plans [line items]      
Surplus (deficit) (5.4) (4.1) (6.4)
Defined benefit obligation, at present value (27.6) (25.4) (25.7)
Unfunded plans by region      
Disclosure of defined benefit plans [line items]      
Surplus (deficit) (90.8) (95.3) (105.4)
Defined benefit obligation, at present value (90.9) (95.3) (105.4)
Unfunded plans by region | North America      
Disclosure of defined benefit plans [line items]      
Surplus (deficit) (37.1) (41.2) (48.2)
Defined benefit obligation, at present value (37.1) (41.2) (48.2)
Unfunded plans by region | Western Continental Europe      
Disclosure of defined benefit plans [line items]      
Surplus (deficit) (26.0) (23.5) (28.9)
Defined benefit obligation, at present value (26.0) (23.5) (28.9)
Unfunded plans by region | Asia Pacific, Latin America, Africa & Middle East and Central & Eastern Europe      
Disclosure of defined benefit plans [line items]      
Surplus (deficit) (27.7) (30.6) (28.3)
Defined benefit obligation, at present value £ (27.8) £ (30.6) £ (28.3)