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Share based compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Share-Based Payment Arrangements [Abstract] |
Information about share-based compensation charges |
|  | 2017 |  | 2016 |  | 2015 |
|  | $M | $M |  | $M |
| I.P.O. related share based compensation charges | — |  |  | — |  |  | 0.1 |  |
| Other share based compensation charges | 2.2 |  |  | 1.4 |  |  | 1.3 |  |
| Restructuring share based compensation charges | 0.9 |  |  | — |  |  | — |  |
|  | 3.1 |  |  | 1.4 |  |  | 1.4 |  |
Disclosure of number and weighted average exercise prices of share options | The movement 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, 2017 | 15,977,968,688 |  |  | 55,816 |  |
| Shares utilized during the year | — |  |  | (34,594 | ) |
| Shares transferred into ESOP during the year | — |  |  | 83,487 |  |
| At December 31, 2017 | 15,977,968,688 |  |  | 104,709 |  |
The following table illustrates the number of, and movements in, share options during the year, with each option relating to 1 ordinary share:
|  | 2017 |  | 2017 |  | 2016 |  | 2016 |
|  | Number |  | Weighted average exercise price |  | Number |  | Weighted average exercise price |
| At January 1 | 963,789 |  |  | $8.51 |  | 1,144,534 |  |  | $7.26 |
| Granted during the year | 386,614 |  |  | $0.65 |  | 107,660 |  |  | $0.67 |
| Exercised during the year | (172,501 | ) |  | $(5.03) |  | (132,599 | ) |  | $(0.67) |
| Accrued dividend awards | 12,258 |  |  | $0.65 |  | 12,572 |  |  | $0.67 |
| Lapsed during the year | (7,845 | ) |  | $(0.65) |  | (168,378 | ) |  | $(0.67) |
| At December 31 | 1,182,315 |  |  | $6.42 |  | 963,789 |  |  | $8.51 |
Disclosure of assumptions used in deriving fair value of share options | The following table illustrates the assumptions used in deriving the fair value of share options during the year:
|  | 2017 |  | 2016 |
| Dividend yield (%) | 4.00 |  | 4.00 |
| Expected volatility range (%) | 26.81 - 35.81 |  | 29.73 – 38.73 |
| Risk-free interest rate (%) | 1.00 - 2.01 |  | 0.36 – 1.05 |
| Expected life of share options range (years) | 0.50 - 7.36 |  | 1 - 3.5 |
| Weighted average exercise price ($) | $0.65 |  | $0.67 |
| Model used | Black-Scholes |  | Black-Scholes |

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- Definition The disclosure of information about indirect, by reference to the fair value of the equity instruments granted, measurement of the fair value of goods or services received as consideration for the entity's share options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The disclosure of the number and weighted average exercise prices of share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The disclosure of the general terms and conditions of share-based payment arrangements. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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