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Share Plans (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Schedule of Movement in Number of Shares Held by ESOP Trustees

			In millions
			At January 1, 2020			$	(1.7)
			Shares sold from ESOP			0.3
			At December 31, 2020			(1.4)
			Utilization of ESOP shares			0.3
			At December 31, 2021			$	(1.1)

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, 2021			15,977,968,688						1,013,512
			Shares utilized during the year			—						(242,579)
			Shares transferred into ESOP during the year			—						67,625
			At December 31, 2021			15,977,968,688						838,558

Schedule of Share-based Compensation Expense

Total share-based compensation expense for 2021, 2020 and 2019 was as follows:

						Years ended December 31,
			In millions			2021						2020						2019
			Total share-based compensation charges			$	2.8					$	2.8					$	4.5

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 1 ordinary share:

						Number of shares						Weighted- average exercise price						Weighted- average remaining contractual life (years)						Aggregate intrinsic value ($M)
			At January 1, 2021			412,804						$	0.87					1.9						$	6.8
			Granted during the year			174,264						$	1.00
			Exercised during the year			(271,851)						$	0.77
			Accrued dividend awards			7,898						$	0.95
			Lapsed during the year			(25,628)						$	0.92
			At December 31, 2021			297,487						$	0.99					2.2						$	5.7
			Options exercisable at December 31, 2021			13,874						$	0.84					3.1						$	0.2
			Options expected to vest as of December 31, 2021			269,432						$	1.00					2.2						$	5.2

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:

						2021						2020						2019
			Dividend yield (%)			2.27						3.39 - 4.09						2.10
			Expected volatility range (%)			42.80 - 59.03						36.48 - 56.28						35.06 - 44.20
			Risk-free interest rate (%)			0.04 - 0.24						0.18 - 0.49						0.74 - 2.52
			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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