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Share Plans (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Movement in Number of Shares Held by ESOP Trustees

Own shares held by ESOP

			In millions
			At January 1, 2019			$	(2.2)
			Shares sold from ESOP			0.2
			Utilization of ESOP shares			0.3
			At December 31, 2019			(1.7)
			Shares sold from ESOP			0.3
			At December 31, 2020			$	(1.4)

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, 2020			15,977,968,688						1,216,220
			Shares utilized during the year			—						(131,909)
			Shares sold from the ESOP during the year			—						(70,799)
			At December 31, 2020			15,977,968,688						1,013,512

Schedule of Share-based Compensation Expense

Total share-based compensation expense for 2020, 2019 and 2018 was as follows:

						Years ended December 31,
			In millions			2020						2019						2018
			Total share-based compensation charges			$	2.8					$	4.5					$	4.8

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 1 ordinary share:

						Number of shares						Weighted- average exercise price						Weighted- average remaining contractual life (years)						Aggregate intrinsic value ($M)
			At January 1, 2020			467,362						$	0.75					1.7						$	8.7
			Granted during the year			166,072						$	1.00
			Exercised during the year			(222,375)						$	0.71
			Accrued dividend awards			14,727						$	0.84
			Lapsed during the year			(12,982)						$	0.90
			At December 31, 2020			412,804						$	0.87					1.9						$	6.8
			Options exercisable at December 31, 2020			11,495						$	0.66					2.4						$	0.2
			Options expected to vest as of December 31, 2020			401,309						$	0.88					1.9						$	6.6

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:

						2020						2019						2018
			Dividend yield (%)			3.39 - 4.09						2.10						4.00
			Expected volatility range (%)			36.48 - 56.28						35.06 - 44.20						22.65 - 35.77
			Risk-free interest rate (%)			0.18 - 0.49						0.74 - 2.52						0.12 - 2.57
			Expected life of share options range (years)			0.50 - 4.00						0.50 - 4.00						0.50 - 6.00
			Forfeiture rate (%)			5.00						5.00						5.00
			Weighted average exercise price ($)			$1.00						$1.00						$0.65
			Models used			Black-Scholes & Monte-Carlo						Black-Scholes & Monte-Carlo						Black-Scholes & Monte-Carlo

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