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Employee Benefit Obligations - Movement in Pension Plan Liabilities (Details) £ in Millions	12 Months Ended
	Dec. 31, 2023 GBP (£) defined_benefit_plan	Dec. 31, 2022 GBP (£)	Dec. 31, 2021 GBP (£)
Disclosure of net defined benefit (liability) asset
Plan liabilities at beginning of year	£ 122.1	£ 136.6
Plan liabilities at end of year	£ 122.2	122.1	£ 136.6
Number of defined benefit pension plans winded up | defined_benefit_plan	2
Full elimination of associated plan assets and plan liabilities	£ 145.0
Retirement benefit obligations
Disclosure of net defined benefit (liability) asset
Plan liabilities at beginning of year	552.6	688.5	772.7
Service cost	12.2	10.4	12.6
Interest cost	20.5	15.5	12.0
Effect of changes in demographic assumptions	0.5	(0.6)	3.6
Effect of changes in financial assumptions	13.8	(143.5)	(31.1)
Effect of experience adjustments	1.3	0.1	(15.7)
Benefits paid	(37.5)	(52.0)	(59.5)
(Gain)/loss due to exchange rate movements	(16.7)	40.4	(6.1)
Settlement payments	(163.2)	(8.7)	(0.3)
Other	(2.3)	2.5	0.3
Plan liabilities at end of year	£ 381.2	£ 552.6	£ 688.5

X

- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

+ References

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

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The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

+ References

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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan in respect of settlements. [Refer: Decrease (increase) in net defined benefit liability (asset) resulting from gains (losses) arising from settlements; Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

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Elimination of Plan Assets and Liabilities

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- Definition

Experience gain/(loss) arising on the plan liabilities.

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Interest cost on plan liabilities

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No definition available.

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Number of Defined Benefit Pension Plans Winded Up

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No definition available.

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