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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2025
Equity [Abstract] |
Schedule of Ordinary Share Capital |
|  | December 31, 2025 |  | December 31, 2024 |  | December 31, 2025 |  |  | December 31, 2024 |  |
|  | 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, 2024 | $ | (22.9) |  |
| Purchase of treasury shares | (2.3) |  |
| Utilization of treasury shares | 0.3 |  |
| At December 31, 2024 | (24.9) |  |
| Purchase of treasury shares | (3.1) |  |
| Utilization of treasury shares | 0.4 |  |
| At December 31, 2025 | $ | (27.6) |  |
Schedule of Own Share Held by ESOP |
| In millions |  |
| At January 1, 2024 | $ | (0.9) |  |
| Utilization of ESOP shares | 0.1 |  |
| At December 31, 2024 | (0.8) |  |
| Utilization of ESOP shares | 0.1 |  |
| At December 31, 2025 | $ | (0.7) |  |
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, 2025 |  |  | 544,603 |  |
| Shares utilized during the year |  |  | (118,128) |  |
| At December 31, 2025 |  |  | 426,475 |  |
Schedule of Dividends Paid and Proposed |
| In millions | 2025 |  | 2024 |  | 2023 |
| Dividends declared and paid during the year: |  |  |  |  |  |
| Interim dividend paid February 1, 2023 ($0.125 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 |  |
| Interim dividend paid February 7, 2024 ($0.130 per ordinary share) | — |  |  | 3.5 |  |  | — |  |
| Interim dividend paid May 8, 2024 ($0.130 per ordinary share) | — |  |  | 3.5 |  |  | — |  |
| Interim dividend paid August 7, 2024 ($0.130 per ordinary share) | — |  |  | 3.5 |  |  | — |  |
| Interim dividend paid November 6, 2024 ($0.130 per ordinary share) | — |  |  | 3.5 |  |  | — |  |
| Interim dividend paid February 5, 2025 ($0.130 per ordinary share) | 3.5 |  |  | — |  |  | — |  |
| Interim dividend paid May 7, 2025 ($0.130 per ordinary share) | 3.5 |  |  | — |  |  | — |  |
| Interim dividend paid August 6, 2025 ($0.130 per ordinary share) | 3.5 |  |  | — |  |  | — |  |
| Interim dividend paid November 5, 2025 ($0.130 per ordinary share) | 3.4 |  |  | — |  |  | — |  |
|  | $ | 13.9 |  |  | $ | 14.0 |  |  | $ | 14.0 |  |
| In millions | 2025 |  | 2024 |  | 2023 |
| Dividends declared and paid after December 31 (not recognized as a liability at December 31): |  |  |  |  |  |
| Interim dividend paid February 7, 2024: ($0.130 per ordinary share) | $ | — |  |  | $ | — |  |  | $ | 3.5 |  |
| Interim dividend paid February 5, 2025: ($0.130 per ordinary share) | — |  |  | 3.5 |  |  | — |  |
| Interim dividend paid February 4, 2026: ($0.130 per ordinary share) | 3.5 |  |  | — |  |  | — |  |
|  | $ | 3.5 |  |  | $ | 3.5 |  |  | $ | 3.5 |  |

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