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Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Schedule of Ordinary Share Capital

						December 31, 2023						December 31, 2022						December 31, 2023									December 31, 2022
						No.						No.						Millions									Millions
			Authorized:
			Ordinary shares of £0.50 each			40,000,000						40,000,000						$	35.7		(1)						$	35.7		(1)
						40,000,000						40,000,000						$	35.7		(1)						$	35.7		(1)
			Allotted, called up and fully paid:
			Ordinary shares of £0.50 each			28,944,000						28,944,000						$	26.5		(1)						$	26.5		(1)
						28,944,000						28,944,000						$	26.5		(1)						$	26.5		(1)

(1)The Company's ordinary share capital is 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
			At January 1, 2022			$	(9.6)
			Purchase of treasury shares			(11.1)
			Utilization of treasury shares			0.3
			At December 31, 2022			(20.4)
			Purchase of treasury shares			(2.7)
			Utilization of treasury shares			0.2
			At December 31, 2023			$	(22.9)

Schedule of Own Share Held by ESOP

			In millions
			At January 1, 2022			$	(1.1)
			Utilization of ESOP shares			0.1
			At December 31, 2022			(1.0)
			Utilization of ESOP shares			0.1
			At December 31, 2023			$	(0.9)

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

£0.50 ordinary shares

At January 1, 2023

721,261

Shares utilized during the year

(85,460)

At December 31, 2023

635,801

Schedule of Dividends Paid and Proposed

			In millions			2023						2022						2021
			Dividends declared and paid during the year:
			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
			Interim dividend paid February 2, 2022 ($0.125 per ordinary share)			—						3.4						—
			Interim dividend paid May 4, 2022 ($0.130 per ordinary share)			—						3.6						—
			Interim dividend paid August 3, 2022 ($0.130 per ordinary share)			—						3.6						—
			Interim dividend paid November 2, 2022 ($0.130 per ordinary share)			—						3.6						—
			Interim dividend paid February 1, 2023 ($0.130 per ordinary share)			3.5						—						—
			Interim dividend paid May 3, 2023 ($0.130 per ordinary share)			3.5						—						—
			Interim dividend paid August 2, 2023 ($0.130 per ordinary share)			3.5						—						—
			Interim dividend paid November 1, 2023 ($0.130 per ordinary share)			3.5						—						—
						$	14.0					$	14.2					$	13.6

			In millions			2023						2022						2021
			Dividends declared and paid after December 31 (not recognized as a liability at December 31):
			Interim dividend paid February 2, 2022: ($0.125 per ordinary share)			$	—					$	—					$	3.4
			Interim dividend paid February 1, 2023: ($0.130 per ordinary share)			—						3.5						—
			Interim dividend paid February 7, 2024: ($0.130 per ordinary share)			3.5						—						—
						$	3.5					$	3.5					$	3.4

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