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Employee Benefit Obligations - Fair Value of Assets and Assessed Present Value of Liabilities in Pension Plans (Details) - GBP (£) £ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure Of Pension Costs [abstract]
Fair value of assets, Equities	£ 24.2	£ 26.7	£ 31.8
Fair value of assets, Bonds	170.2	208.8	259.7
Fair value of assets, Insured annuities	3.0	149.2	222.5
Fair value of assets, Property	1.3	1.4	1.0
Fair value of assets, Cash	18.3	18.1	15.3
Fair value of assets, Other	42.0	26.3	21.8
Total fair value of assets	259.0	430.5	552.1
Defined benefit obligation, at present value	(381.2)	(552.6)	(688.5)
Surplus (deficit) in plan	(122.2)	(122.1)	(136.4)
Irrecoverable Surplus	0.0	0.0	(0.2)
Net liability	(122.2)	(122.1)	(136.6)
Plans in surplus	13.7	15.4	30.1
Plans in deficit	£ (135.9)	£ (137.5)	£ (166.7)
Fair value of assets allocation, Equities	9.30%	6.20%	5.80%
Fair value of assets allocation, Bonds	65.70%	48.50%	47.00%
Fair value of assets allocation, Insured annuities	1.20%	34.70%	40.30%
Fair value of assets allocation, Property	0.50%	0.30%	0.20%
Fair value of assets allocation, Cash	7.10%	4.20%	2.80%
Fair value of assets allocation, Other	16.20%	6.10%	3.90%
Total fair value of assets allocation	100.00%	100.00%	100.00%

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- Definition

The amount cash and cash equivalents contribute to the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [member]]

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The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

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The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

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The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]]

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Disclosure Of Pension Costs [abstract]

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