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Share Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Movement in Number of Shares deld by ESOP Trustees | Own shares held by ESOP
| In millions |  |
| At January 1, 2018 | $ | (1.0 | ) |
| Issue of new shares | (1.3 | ) |
| Shares sold from ESOP | 0.4 |  |
| Transfer of treasury shares into ESOP | (1.4 | ) |
| Utilization of ESOP shares | 1.1 |  |
| At December 31, 2018 | (2.2 | ) |
| Shares sold from ESOP | 0.2 |  |
| Utilization of ESOP shares | 0.3 |  |
| At December 31, 2019 | $ | (1.7 | ) |
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 |
|  | £0.0001 deferred shares |  | £0.50 ordinary shares |
| At January 1, 2019 | 15,977,968,688 |  |  | 1,621,301 |  |
| Shares utilized during the year | — |  |  | (253,881 | ) |
| Shares sold from the ESOP during the year | — |  |  | (151,200 | ) |
| At December 31, 2019 | 15,977,968,688 |  |  | 1,216,220 |  |
Schedule of Share-based Compensation Expense | Total share-based compensation expense for 2019, 2018 and 2017 was as follows:
|  | Years ended December 31, |
| In millions | 2019 |  | 2018 |  | 2017 |
| Other share-based compensation charges | $ | 4.5 |  |  | $ | 4.8 |  |  | $ | 2.2 |  |
| Restructuring share-based compensation charges | — |  |  | — |  |  | 0.9 |  |
| Total share-based compensation charges | $ | 4.5 |  |  | $ | 4.8 |  |  | $ | 3.1 |  |
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 1 ordinary share:
|  | Number of shares |  | Weighted- average exercise price |  | Weighted- average remaining contractual life (years) |  | Aggregate intrinsic value ($M) |
| At January 1, 2019 | 849,064 |  |  | $ | 2.10 |  |  | 1.9 |  | $ | 13.3 |  |
| Granted during the year | 212,419 |  |  | $ | 0.90 |  |  |  |  |  |
| Exercised during the year | (491,216 | ) |  | $ | 2.65 |  |  |  |  |  |
| Accrued dividend awards | 13,838 |  |  | $ | 0.72 |  |  |  |  |  |
| Lapsed during the year | (116,743 | ) |  | $ | 2.43 |  |  |  |  |  |
| At December 31, 2019 | 467,362 |  |  | $ | 0.75 |  |  | 1.7 |  | $ | 8.7 |  |
| Options exercisable at December 31, 2019 | 8,903 |  |  | $ | 0.66 |  |  | 2.1 |  | $ | 0.2 |  |
| Options expected to vest as of December 31, 2019 | 458,459 |  |  | $ | 0.75 |  |  | 1.7 |  | $ | 8.5 |  |
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:
|  | 2019 |  | 2018 |  | 2017 |
| Dividend yield (%) | 2.10 |  | 4.00 |  | 4.00 |
| Expected volatility range (%) | 35.06 - 44.20 |  | 22.65 - 35.77 |  | 26.81- 35.81 |
| Risk-free interest rate (%) | 0.74 - 2.52 |  | 0.12 - 2.57 |  | 1.00 - 2.01 |
| Expected life of share options range (years) | 0.50 - 4.00 |  | 0.50 - 6.00 |  | 0.50 - 7.36 |
| Forfeiture rate (%) | 5.00 |  | 5.00 |  | 5.00 |
| Weighted average exercise price ($) | $1.00 |  | $0.65 |  | $0.65 |
| Models used | Black-Scholes & Monte-Carlo |  | Black-Scholes & Monte-Carlo |  | Black-Scholes |

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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 http://asc.fasb.org/extlink&oid=109197908&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 http://asc.fasb.org/extlink&oid=109197908&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 http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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