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Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2021

Equity [Abstract]

Schedule of Ordinary Share Capital

						December 31, 2021						December 31, 2020						December 31, 2021									December 31, 2020
						No.						No.						Millions									Millions
			Authorized:
			Ordinary shares of £0.50 each			40,000,000						40,000,000						$	35.7		(1)						$	35.7		(1)
			Deferred ordinary shares of £0.0001 each			761,835,318,444						761,835,338,444						149.9			(1)						149.9			(1)
						761,875,318,444						761,875,338,444						$	185.6		(1)						$	185.6		(1)
			Allotted, called up and fully paid:
			Ordinary shares of £0.50 each			28,944,000						29,000,000						$	26.5		(1)						$	26.6		(1)
			Deferred ordinary shares of £0.0001 each			761,835,318,444						761,835,338,444						149.9			(1)						149.9			(1)
						761,864,262,444						761,864,338,444						$	176.4		(1)						$	176.5		(1)

(1)The Company's ordinary and deferred share capital are shown in U.S. dollars at the exchange rate prevailing at the month-end spot rate at the time of the share capital being issued.

Schedule of Treasury Shares

			In millions
			January 1, 2020 and December 31, 2020			(4.0)
			Purchase of treasury shares			(6.4)
			Cancellation of treasury shares			0.7
			Utilization of treasury shares			0.1
			At December 31, 2021			$	(9.6)

Schedule of Own Share Held by ESOP

			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 Dividends Paid and Proposed

			In millions			2021						2020						2019
			Dividends declared and paid during the year:
			Interim dividend paid February 6, 2019 ($0.125 per ordinary share)			$	—					$	—					$	3.4
			Interim dividend paid May 1, 2019 ($0.125 per ordinary share)			—						—						3.4
			Interim dividend paid August 7, 2019 ($0.125 per ordinary share)			—						—						3.4
			Interim dividend paid November 6, 2019 ($0.125 per ordinary share)			—						—						3.4
			Interim dividend paid February 5, 2020 ($0.125 per ordinary share)			—						3.4						—
			Interim dividend paid May 6, 2020 ($0.125 per ordinary share)			—						3.4						—
			Interim dividend paid August 5, 2020 ($0.125 per ordinary share)			—						3.4						—
			Interim dividend paid November 4, 2020 ($0.125 per ordinary share)			—						3.4						—
			Interim dividend paid February 4, 2021 ($0.125 per ordinary share)			3.4						—						—
			Interim dividend paid May 5, 2021 ($0.125 per ordinary share)			3.4						—						—
			Interim dividend paid August 4, 2021 ($0.125 per ordinary share)			3.4						—						—
			Interim dividend paid November 3, 2021 ($0.125 per ordinary share)			3.4						—						—
						$	13.6					$	13.6					$	13.6

			In millions			2021						2020						2019
			Dividends declared and paid after December 31 (not recognized as a liability at December 31):
			Interim dividend paid February 5, 2020: ($0.125 per ordinary share)			$	—					$	—					$	3.4
			Interim dividend paid February 4, 2021: ($0.125 per ordinary share)			—						3.4						—
			Interim dividend paid February 2, 2022 : ($0.125 per ordinary share)			3.4						—						—
						$	3.4					$	3.4					$	3.4

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