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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Schedule of Ordinary Share Capital | Ordinary share capital
|  | December 31, 2019 |  | December 31, 2018 |  | December 31, 2019 |  |  | December 31, 2018 |  |
|  | No. |  | No. |  | Millions |  |  | Millions |  |
| Authorized: |  |  |  |  |  |  |  |  |  |
| Ordinary shares of £0.50 each | 40,000,000 |  |  | 40,000,000 |  |  | $ | 35.7 |  | (1) |  | $ | 35.7 |  | (1) |
| Deferred ordinary shares of £0.0001 each | 761,835,338,444 |  |  | 761,845,318,444 |  |  | 149.9 |  | (1) |  | 149.9 |  | (1) |
|  | 761,875,338,444 |  |  | 761,885,318,444 |  |  | $ | 185.6 |  | (1) |  | $ | 185.6 |  | (1) |
| Allotted, called up and fully paid: |  |  |  |  |  |  |  |  |  |
| Ordinary shares of £0.50 each | 29,000,000 |  |  | 29,000,000 |  |  | $ | 26.6 |  | (1) |  | $ | 26.6 |  | (1) |
| Deferred ordinary shares of £0.0001 each | 761,835,338,444 |  |  | 761,835,338,444 |  |  | 149.9 |  | (1) |  | 149.9 |  | (1) |
|  | 761,864,338,444 |  |  | 761,864,338,444 |  |  | $ | 176.5 |  | (1) |  | $ | 176.5 |  | (1) |
| ​ | ​ |  |  | ​ |  |  | ​ |  | ​ |  | ​ |  | ​ |
(1) The Company's ordinary and deferred share capital are 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. This rate at the end of February 2007 was $1.9613:£1 when the first 20,000,000 shares were issued; the rate at the end of October 2012 was $1.6129:£1 when 7,000,000 shares were issued; the rate at the end of March 2013 was $1.5173:£1 when 1,924 shares were issued; the rate at the end of January 2014 was $1.6487:£1 when 12,076 shares were issued; the rate at the end of May 2014 was $1.6760:£1 when 24,292 shares were issued; the rate at the end of August 2014 was $1.6580:£1 when 58,399 shares were issued; the rate at the end of February 2015 was $1.5436:£1 when 8,563 shares were issued; the rate at the end of March 2015 was $1.4847:£1 when 3,866 shares were issued; the rate at the end of June 2015 was $1.5715:£1 when 27,679 shares were issued; and the rate at the end of August 2018 when was $1.2843:£1 when 1,863,201 shares were issued.
Schedule of Treasury Shares | Treasury Shares
| In millions |  |
| At January 1, 2018 | $ | (5.8 | ) |
| Transfer of treasury shares into ESOP | 1.4 |  |
| Utilization of treasury shares | 0.1 |  |
| At December 31, 2018 | (4.3 | ) |
| Utilization of treasury shares | 0.3 |  |
| At December 31, 2019 | $ | (4.0 | ) |
Schedule of Own Share Held by ESOP | 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 Dividends Paid and Proposed | Dividends paid and proposed
| In millions | 2019 |  | 2018 |  | 2017 |
| Dividends declared and paid during the year: |  |  |  |  |  |
| Interim dividend paid February 1, 2017 ($0.125 per ordinary share) | — |  |  | — |  |  | 3.3 |  |
| Interim dividend paid May 3, 2017 ($0.125 per ordinary share) | — |  |  | — |  |  | 3.3 |  |
| Interim dividend paid August 2, 2017 ($0.125 per ordinary share) | — |  |  | — |  |  | 3.3 |  |
| Interim dividend paid November 1, 2017 ($0.125 per ordinary share) | — |  |  | — |  |  | 3.4 |  |
| Interim dividend paid February 7, 2018 ($0.125 per ordinary share) | — |  |  | 3.4 |  |  | — |  |
| Interim dividend paid May 2, 2018 ($0.125 per ordinary share) | — |  |  | 3.3 |  |  | — |  |
| Interim dividend paid August 1, 2018 ($0.125 per ordinary share) | — |  |  | 3.3 |  |  | — |  |
| Interim dividend paid November 7, 2018 ($0.125 per ordinary share) | — |  |  | 3.4 |  |  | — |  |
| Interim dividend paid February 6, 2019 ($0.125 per ordinary share) | 3.4 |  |  | — |  |  | — |  |
| Interim dividend paid May 1, 2019 ($0.125 per ordinary share) | 3.4 |  |  | — |  |  | — |  |
| Interim dividend paid August 7, 2018 ($0.125 per ordinary share) | 3.4 |  |  | — |  |  | — |  |
| Interim dividend paid November 6, 2019 ($0.125 per ordinary share) | 3.4 |  |  | — |  |  | — |  |
|  | $ | 13.6 |  |  | $ | 13.4 |  |  | $ | 13.3 |  |
| In millions | 2019 |  | 2018 |  | 2017 |
| Dividends declared and paid after December 31 (not recognized as a liability at December 31): |  |  |  |  |  |
| Interim dividend paid February 7, 2018: ($0.125 per ordinary share) | $ | — |  |  | $ | — |  |  | $ | 3.4 |  |
| Interim dividend paid February 6, 2019: ($0.125 per ordinary share) | — |  |  | 3.4 |  |  | — |  |
| Interim dividend paid February 5, 2020: ($0.125 per ordinary share) | 3.4 |  |  | — |  |  | — |  |
|  | $ | 3.4 |  |  | $ | 3.4 |  |  | $ | 3.4 |  |
| ​ | ​ |  |  | ​ |  |  | ​ |  |

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