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Share Plans (Tables) | 12 Months Ended
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Dec. 31, 2025
Share-Based Payment Arrangement [Abstract] |
Schedule of Movement in Number of Shares Held by ESOP Trustees |
| 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 Share-based Compensation Expense | Share-based compensation expense for continuing operations for the years ended December 31, 2025, 2024 and 2023 was as follows:
|  | Years ended December 31, |
| In millions | 2025 |  | 2024 |  | 2023 |
| Total share-based compensation charges | $ | 3.6 |  |  | $ | 3.5 |  |  | $ | 2.8 |  |
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 one ordinary share:
|  | Number of shares |  | Weighted- average exercise price |  | Weighted- average remaining contractual life (years) |  | Aggregate intrinsic value ($M) |
| At January 1, 2025 | 1,125,192 |  |  | $ | 1.00 |  |  | 2.1 |  | $ | 14.7 |  |
| Granted during the year | 382,578 |  |  | $ | 0.88 |  |  |  |  |  |
| Exercised during the year | (196,234) |  |  | $ | 0.75 |  |  |  |  |  |
| Accrued dividend awards | 15,272 |  |  | $ | 0.87 |  |  |  |  |  |
| Lapsed during the year | (125,892) |  |  | $ | 1.00 |  |  |  |  |  |
| At December 31, 2025 | 1,200,916 |  |  | $ | 0.96 |  |  | 1.7 |  | $ | 16.3 |  |
| Options exercisable at December 31, 2025 | 28,544 |  |  | $ | 1.00 |  |  | 2.4 |  | $ | 0.4 |  |
| Options expected to vest as of December 31, 2025 | 802,657 |  |  | $ | 0.94 |  |  | 1.8 |  | $ | 10.9 |  |
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:
|  | 2025 |  | 2024 |  | 2023 |
| Dividend yield (%) | 4.40 - 5.52 |  | 4.40 - 6.03 |  | 3.15 3.32 |
| Expected volatility range (%) | 38.31 - 41.86 |  | 36.40 - 45.79 |  | 31.54 - 43.49 |
| Risk-free interest rate (%) | 4.03 - 4.11 |  | 3.87 - 5.08 |  | 3.67 - 5.16 |
| Expected life of share options range (years) | 1.00 - 4.00 |  | 1.00 - 4.00 |  | 1.00 - 4.00 |
| Forfeiture rate (%) | 5.00 |  |  | 5.00 |  |  | 5.00 |  |
| Weighted average exercise price ($) | $0.75 |  | $1.00 |  | $1.00 |
| Models used | Black-Scholes & Monte-Carlo |  | Black-Scholes & Monte-Carlo |  | Black-Scholes & Monte-Carlo |

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