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Share Plans (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Schedule of Movement in Number of Shares Held by ESOP Trustees

			In millions
			At January 1, 2022			$	(1.1)
			Utilization of ESOP shares			0.1
			At December 31, 2022			(1.0)
			Utilization of ESOP shares			0.1
			At December 31, 2023			$	(0.9)

The change in the number of shares held by the Trustees of the ESOP and the number of share options held over those shares are shown below:

Number of shares held by ESOP Trustees

£0.50 ordinary shares

At January 1, 2023

721,261

Shares utilized during the year

(85,460)

At December 31, 2023

635,801

Schedule of Share-based Compensation Expense

Total share-based compensation expense for 2023, 2022 and 2021 was as follows:

						Years ended December 31,
			In millions			2023						2022						2021
			Total share-based compensation charges			$	2.8					$	2.5					$	2.8

Share-based Compensation, Stock Options, Activity

The following tables illustrates the number of, and movements in, share options during the year, with each option relating to one ordinary share:

						Number of shares						Weighted- average exercise price						Weighted- average remaining contractual life (years)						Aggregate intrinsic value ($M)
			At January 1, 2023			579,153						$	1.00					3.0						$	8.0
			Granted during the year			314,828						$	1.00
			Exercised during the year			(116,148)						$	1.00
			Accrued dividend awards			10,902						$	1.00
			Lapsed during the year			(75,638)						$	1.00
			At December 31, 2023			713,097						$	1.00					3.0						$	6.4
			Options exercisable at December 31, 2023			16,423						$	1.00					2.9						$	0.1
			Options expected to vest as of December 31, 2023			387,123						$	1.00					3.0						$	3.5

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following table illustrates the assumptions used in deriving the fair value of share options during the year:

						2023						2022						2021
			Dividend yield (%)			3.15 - 3.32						2.75 - 3.41						2.27
			Expected volatility range (%)			31.54 - 43.49						36.11 - 49.43						42.80 - 59.03
			Risk-free interest rate (%)			3.67 - 5.16						1.28 - 2.99						0.04 - 0.24
			Expected life of share options range (years)			1.00 - 4.00						0.50 - 4.00						0.50 - 4.00
			Forfeiture rate (%)			5.00						5.00						5.00
			Weighted average exercise price ($)			$1.00						$1.00						$1.00
			Models used			Black-Scholes & Monte-Carlo						Black-Scholes & Monte-Carlo						Black-Scholes & Monte-Carlo

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