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Employee Benefit Obligations - Pension Expense Charged to Operating Profit, Amounts Charged to Finance Costs and Amounts Recognised in Consolidated Statement of Comprehensive Income (OCI) (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of net defined benefit (liability) asset
Service cost	£ 12.2	£ 10.4	£ 12.6
Administrative expenses	2.8	3.1	2.3
Charge to operating profit	15.0	13.5	14.9
Net interest expense on pension plans	4.3	2.2	1.8
Charge to profit before taxation for defined benefit plans	19.3	15.7	16.7
Actuarial (loss)/gain recognised in OCI	(9.1)	16.6	14.3
Post employment pension other comprehensive income
Disclosure of net defined benefit (liability) asset
Return on plan assets (excluding interest income)	6.5	(127.6)	(29.3)
Changes in demographic assumptions underlying the present value of the plan liabilities	(0.5)	0.6	(3.6)
Changes in financial assumptions underlying the present value of the plan liabilities	(13.8)	143.5	31.1
Experience (loss)/gain arising on the plan liabilities	(1.3)	(0.1)	15.7
Change in irrecoverable surplus	0.0	0.2	0.4
Actuarial (loss)/gain recognised in OCI	£ (9.1)	£ 16.6	£ 14.3

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

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

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.

+ References

No definition available.

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

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

The amount of other comprehensive income, before tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income]

+ References

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

The amount of post-employment benefit expense included in profit or loss relating to defined benefit plans. [Refer: Profit (loss); Defined benefit plans [member]] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from expense (income) in profit or loss]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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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-Number 19
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- Definition

Administrative Expense Net Defined Benefit Liability Asset.

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No definition available.

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- Definition

Change in irrecoverable surplus net defined benefit liability asset.

+ References

No definition available.

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- Definition

Charge to profit before taxation for defined benefit plans.

+ References

No definition available.

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

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No definition available.

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Service cost net defined benefit liability asset.

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No definition available.

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