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Share Plans (Tables)

12 Months Ended

Dec. 31, 2022

Share-Based Payment Arrangement [Abstract]

Schedule of Movement in Number of Shares Held by ESOP Trustees

			In millions
			At January 1, 2021			$	(1.4)
			Utilization of ESOP shares			0.3
			At December 31, 2021			(1.1)
			Utilization of ESOP shares			0.1
			At December 31, 2022			$	(1.0)

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
						£0.0001 deferred shares						£0.50 ordinary shares
			At January 1, 2022			15,977,968,688						838,558
			Shares utilized during the year			—						(117,297)
			Shares sold from the ESOP during the year			(15,977,968,688)						—
			At December 31, 2022			—						721,261

Schedule of Share-based Compensation Expense

Total share-based compensation expense for 2022, 2021 and 2020 was as follows:

						Years ended December 31,
			In millions			2022						2021						2020
			Total share-based compensation charges			$	2.5					$	2.8					$	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, 2022			547,522						$	0.99					2.2						$	10.6
			Granted during the year			472,695						$	1.00
			Exercised during the year			(173,017)						$	0.98
			Accrued dividend awards			8,829						$	1.00
			Lapsed during the year			(276,876)						$	0.96
			At December 31, 2022			579,153						$	1.00					3.0						$	8.0
			Options exercisable at December 31, 2022			9,862						$	1.00					3.3						$	0.1
			Options expected to vest as of December 31, 2022			434,548						$	1.00					3.0						$	6.0

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:

						2022						2021						2020
			Dividend yield (%)			2.75 - 3.41						2.27						3.39 - 4.09
			Expected volatility range (%)			36.11 - 49.43						42.80 - 59.03						36.48 - 56.28
			Risk-free interest rate (%)			1.28 - 2.99						0.04 - 0.24						0.18 - 0.49
			Expected life of share options range (years)			0.50 - 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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