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Finance costs (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Analysis of income and expense [abstract] |
Schedule of finance costs | Finance costs
|  | 2017 |  | 2016 |  | 2015 |
|  | $M |  | $M |  | $M |
| Bank and other loan interest payable | 6.3 |  |  | 6.3 |  |  | 6.5 |  |
| Amortization of issue costs | 0.6 |  |  | 0.5 |  |  | 0.9 |  |
| Foreign exchange loss on financing activities | 0.3 |  |  | — |  |  | — |  |
| IAS 19R retirement benefits finance charge | 1.8 |  |  | 2.1 |  |  | 3.0 |  |
| Unwind of discount on deferred contingent consideration from acquisitions | 0.2 |  |  | 0.4 |  |  | 0.4 |  |
| Total finance costs | 9.2 |  |  | 9.3 |  |  | 10.8 |  |

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