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Share Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Schedule of Movement in Number of Shares Held by ESOP Trustees |
| 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 Share-based Compensation Expense | Total share-based compensation expense for 2023, 2022 and 2021 was as follows:
|  | Years ended December 31, |
| In millions | 2023 |  | 2022 |  | 2021 |
| Total share-based compensation charges | $ | 2.8 |  |  | $ | 2.5 |  |  | $ | 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, 2023 | 579,153 |  |  | $ | 1.00 |  |  | 3.0 |  | $ | 8.0 |  |
| Granted during the year | 314,828 |  |  | $ | 1.00 |  |  |  |  |  |
| Exercised during the year | (116,148) |  |  | $ | 1.00 |  |  |  |  |  |
| Accrued dividend awards | 10,902 |  |  | $ | 1.00 |  |  |  |  |  |
| Lapsed during the year | (75,638) |  |  | $ | 1.00 |  |  |  |  |  |
| At December 31, 2023 | 713,097 |  |  | $ | 1.00 |  |  | 3.0 |  | $ | 6.4 |  |
| Options exercisable at December 31, 2023 | 16,423 |  |  | $ | 1.00 |  |  | 2.9 |  | $ | 0.1 |  |
| Options expected to vest as of December 31, 2023 | 387,123 |  |  | $ | 1.00 |  |  | 3.0 |  | $ | 3.5 |  |
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:
|  | 2023 |  | 2022 |  | 2021 |
| Dividend yield (%) | 3.15 - 3.32 |  | 2.75 - 3.41 |  | 2.27 |
| Expected volatility range (%) | 31.54 - 43.49 |  | 36.11 - 49.43 |  | 42.80 - 59.03 |
| Risk-free interest rate (%) | 3.67 - 5.16 |  | 1.28 - 2.99 |  | 0.04 - 0.24 |
| Expected life of share options range (years) | 1.00 - 4.00 |  | 0.50 - 4.00 |  | 0.50 - 4.00 |
| Forfeiture rate (%) | 5.00 |  |  | 5.00 |  |  | 5.00 |  |
| Weighted average exercise price ($) | $1.00 |  | $1.00 |  | $1.00 |
| Models used | Black-Scholes & Monte-Carlo |  | Black-Scholes & Monte-Carlo |  | Black-Scholes & Monte-Carlo |

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