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Dividends paid and proposed | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Dividends [Abstract] |
Dividends paid and proposed | Dividends paid and proposed
|  | 2017 |  | 2016 |  | 2015 |
|  | $M |  | $M |  | $M |
| Dividends declared and paid during the year: |  |  |  |  |  |  |  |  |
| Interim dividend paid February 4, 2015 ($0.10 per ordinary share) | — |  |  | — |  |  | 2.7 |  |
| Interim dividend paid May 6, 2015 ($0.10 per ordinary share) | — |  |  | — |  |  | 2.7 |  |
| Interim dividend paid August 5, 2015 ($0.10 per ordinary share) | — |  |  | — |  |  | 2.7 |  |
| Interim dividend paid November 4, 2015 ($0.10 per ordinary share) | — |  |  | — |  |  | 2.7 |  |
| Interim dividend paid February 3, 2016 ($0.125 per ordinary share) | — |  |  | 3.4 |  |  | — |  |
| Interim dividend paid May 4, 2016 ($0.125 per ordinary share) | — |  |  | 3.3 |  |  | — |  |
| Interim dividend paid August 3, 2016 ($0.125 per ordinary share) | — |  |  | 3.3 |  |  | — |  |
| Interim dividend paid November 2, 2016 ($0.125 per ordinary share) | — |  |  | 3.3 |  |  | — |  |
| 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 |  |  | — |  |  | — |  |
|  | 13.3 |  |  | 13.3 |  |  | 10.8 |  |
|  | 2017 |  | 2016 |  | 2015 |
|  | $M |  | $M |  | $M |
| Dividends declared and paid after December 31 (not recognized as a liability at December 31): |  |  |  |  |  |  |  |  |
| Interim dividend paid February 3, 2016: ($0.125 per ordinary share) | — |  |  | — |  |  | 2.7 |  |
| Interim dividend paid February 1, 2017: ($0.125 per ordinary share) | — |  |  | 3.3 |  |  | — |  |
| Interim dividend paid February 7, 2018: ($0.125 per ordinary share) | 3.4 |  |  | — |  |  | — |  |
|  | 3.4 |  |  | 3.3 |  |  | 2.7 |  |
| ​ | ​ |  |  | ​ |  |  | ​ |  |

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- Definition The disclosure of dividends. Dividends are distributions of profits to holders of equity investments in proportion to their holdings of a particular class of capital. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_10_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Disclosure Of Dividends [Abstract] + References No definition available. + Details
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