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Dividends paid and proposed (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Dividends [Abstract] |
Schedule of dividends |
|  | 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 Disclosure Of Dividends [Abstract] + References No definition available. + Details
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- Definition Schedule Of Dividends [Table Text Block] + References No definition available. + Details
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