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Finance income (Tables) | 12 Months Ended
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Dec. 31, 2017
Analysis of income and expense [abstract] |
Schedule Of Finance Income | Finance income
|  | 2017 |  | 2016 |  | 2015 |
|  | $M |  | $M |  | $M |
| Bank interest received | 0.2 |  |  | 0.2 |  |  | 0.2 |  |
| Other interest received | 0.3 |  |  | 0.3 |  |  | 0.3 |  |
| Foreign exchange gains on financing activities | — |  |  | 0.7 |  |  | — |  |
| Total finance income | 0.5 |  |  | 1.2 |  |  | 0.5 |  |

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- Definition Schedule Of Finance Income [Table Text Block] + References No definition available. + Details
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