Employee Benefit Obligations - Movement in Pension Plan Assets (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
Fair value of plan assets at beginning of year	£ (122.1)	£ (136.6)
Employer contributions	19.8	24.0	£ 16.7
Administrative expenses	(2.8)	(3.1)	(2.3)
Fair value of plan assets 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
Plan assets
Disclosure of net defined benefit (liability) asset
Fair value of plan assets at beginning of year	430.5	552.1	616.6
Interest income on plan assets	16.2	13.3	10.2
Return on plan assets (excluding interest income)	6.5	(127.6)	(29.3)
Employer contributions	19.8	24.0	16.7
Benefits paid	(37.5)	(52.0)	(59.5)
(Loss)/gain due to exchange rate movements	(12.4)	31.5	(0.6)
Settlement payments	(163.2)	(8.7)	(0.3)
Administrative expenses	(2.8)	(3.1)	(1.8)
Other	1.9	1.0	0.1
Fair value of plan assets at end of year	259.0	430.5	552.1
Actual return/(loss) on plan assets	£ 22.7	£ (114.3)	£ (19.1)

The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

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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No definition available.

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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
-Number 19
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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

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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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]]

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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plan assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

+ References

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

Actual return on plan assets

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No definition available.

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Administrative Expense Net Defined Benefit Liability Asset.

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No definition available.

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- Definition

Elimination of Plan Assets and Liabilities

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No definition available.

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- Definition

Interest income on plan assets.

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No definition available.

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- Definition

Number of Defined Benefit Pension Plans Winded Up

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No definition available.

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