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Share Plans (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Schedule of Movement in Number of Shares Held by ESOP Trustees |
| In millions |  |
| At January 1, 2021 | $ | (1.4) |  |
| Utilization of ESOP shares | 0.3 |  |
| At December 31, 2021 | (1.1) |  |
| Utilization of ESOP shares | 0.1 |  |
| At December 31, 2022 | $ | (1.0) |  |
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, 2022 | 15,977,968,688 |  |  | 838,558 |  |
| Shares utilized during the year | — |  |  | (117,297) |  |
| Shares sold from the ESOP during the year | (15,977,968,688) |  |  | — |  |
| At December 31, 2022 | — |  |  | 721,261 |  |
Schedule of Share-based Compensation Expense | Total share-based compensation expense for 2022, 2021 and 2020 was as follows:
|  | Years ended December 31, |
| In millions | 2022 |  | 2021 |  | 2020 |
| Total share-based compensation charges | $ | 2.5 |  |  | $ | 2.8 |  |  | $ | 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, 2022 | 547,522 |  |  | $ | 0.99 |  |  | 2.2 |  | $ | 10.6 |  |
| Granted during the year | 472,695 |  |  | $ | 1.00 |  |  |  |  |  |
| Exercised during the year | (173,017) |  |  | $ | 0.98 |  |  |  |  |  |
| Accrued dividend awards | 8,829 |  |  | $ | 1.00 |  |  |  |  |  |
| Lapsed during the year | (276,876) |  |  | $ | 0.96 |  |  |  |  |  |
| At December 31, 2022 | 579,153 |  |  | $ | 1.00 |  |  | 3.0 |  | $ | 8.0 |  |
| Options exercisable at December 31, 2022 | 9,862 |  |  | $ | 1.00 |  |  | 3.3 |  | $ | 0.1 |  |
| Options expected to vest as of December 31, 2022 | 434,548 |  |  | $ | 1.00 |  |  | 3.0 |  | $ | 6.0 |  |
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:
|  | 2022 |  | 2021 |  | 2020 |
| Dividend yield (%) | 2.75 - 3.41 |  | 2.27 |  | 3.39 - 4.09 |
| Expected volatility range (%) | 36.11 - 49.43 |  | 42.80 - 59.03 |  | 36.48 - 56.28 |
| Risk-free interest rate (%) | 1.28 - 2.99 |  | 0.04 - 0.24 |  | 0.18 - 0.49 |
| Expected life of share options range (years) | 0.50 - 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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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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