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Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Schedule of Ordinary Share Capital

Ordinary share capital

						December 31, 2020						December 31, 2019						December 31, 2020									December 31, 2019
						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			761,835,338,444						761,835,338,444						149.9			(1)						149.9			(1)
						761,875,338,444						761,875,338,444						$	185.6		(1)						$	185.6		(1)
			Allotted, called up and fully paid:
			Ordinary shares of £0.50 each			29,000,000						29,000,000						$	26.6		(1)						$	26.6		(1)
			Deferred ordinary shares of £0.0001 each			761,835,338,444						761,835,338,444						149.9			(1)						149.9			(1)
						761,864,338,444						761,864,338,444						$	176.5		(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

Treasury Shares

			In millions
			At January 1, 2019			$	(4.3)
			Utilization of treasury shares			0.3
			At December 31, 2019			(4.0)
			At December 31, 2020			$	(4.0)

Schedule of Own Share Held by ESOP

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 Dividends Paid and Proposed

Dividends paid and proposed

			In millions			2020						2019						2018
			Dividends declared and paid during the year:
			Interim dividend paid February 7, 2018 ($0.125 per ordinary share)			$	—					$	—					$	3.4
			Interim dividend paid May 2, 2018 ($0.125 per ordinary share)			—						—						3.3
			Interim dividend paid August 1, 2018 ($0.125 per ordinary share)			—						—						3.3
			Interim dividend paid November 7, 2018 ($0.125 per ordinary share)			—						—						3.4
			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						—						—
						$	13.6					$	13.6					$	13.4

			In millions			2020						2019						2018
			Dividends declared and paid after December 31 (not recognized as a liability at December 31):
			Interim dividend paid February 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 February 4, 2021: ($0.125 per ordinary share)			3.4						—						—
						$	3.4					$	3.4					$	3.4

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