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Share Plans (Tables)

12 Months Ended

Dec. 31, 2025

Share-Based Payment Arrangement [Abstract]

Schedule of Movement in Number of Shares Held by ESOP Trustees

			In millions
			At January 1, 2024			$	(0.9)
			Utilization of ESOP shares			0.1
			At December 31, 2024			(0.8)
			Utilization of ESOP shares			0.1
			At December 31, 2025			$	(0.7)

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, 2025

544,603

Shares utilized during the year

(118,128)

At December 31, 2025

426,475

Schedule of Share-based Compensation Expense

Share-based compensation expense for continuing operations for the years ended December 31, 2025, 2024 and 2023 was as follows:

						Years ended December 31,
			In millions			2025						2024						2023
			Total share-based compensation charges			$	3.6					$	3.5					$	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, 2025			1,125,192						$	1.00					2.1						$	14.7
			Granted during the year			382,578						$	0.88
			Exercised during the year			(196,234)						$	0.75
			Accrued dividend awards			15,272						$	0.87
			Lapsed during the year			(125,892)						$	1.00
			At December 31, 2025			1,200,916						$	0.96					1.7						$	16.3
			Options exercisable at December 31, 2025			28,544						$	1.00					2.4						$	0.4
			Options expected to vest as of December 31, 2025			802,657						$	0.94					1.8						$	10.9

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:

						2025						2024						2023
			Dividend yield (%)			4.40 - 5.52						4.40 - 6.03						3.15 3.32
			Expected volatility range (%)			38.31 - 41.86						36.40 - 45.79						31.54 - 43.49
			Risk-free interest rate (%)			4.03 - 4.11						3.87 - 5.08						3.67 - 5.16
			Expected life of share options range (years)			1.00 - 4.00						1.00 - 4.00						1.00 - 4.00
			Forfeiture rate (%)			5.00						5.00						5.00
			Weighted average exercise price ($)			$0.75						$1.00						$1.00
			Models used			Black-Scholes & Monte-Carlo						Black-Scholes & Monte-Carlo						Black-Scholes & Monte-Carlo

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