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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings per share [abstract] |
Schedule of earnings per share | Management believe the use of non-GAAP financial measures such as adjusted earnings, as reconciled in the table below, per share more closely reflects the underlying earnings per share performance.
|  | 2017 |  | 2016 |  | 2015 |
|  | $M |  | $M |  | $M |
| Basic earnings: |  |  |  |  |  |
| Net income | 11.5 |  |  | 21.9 |  |  | 16.1 |  |
| Adjusted earnings: |  |  |  |  |  |
| Accounting charges relating to acquisitions and disposals of businesses |  |  |  |  |  |
| Unwind of discount on deferred contingent consideration from acquisitions | 0.2 |  |  | 0.4 |  |  | 0.4 |  |
| Acquisitions and disposals (Note 5) | (1.3 | ) |  | (0.2 | ) |  | 2.0 |  |
| Amortization on acquired intangibles | 1.2 |  |  | 1.0 |  |  | 1.4 |  |
| IAS 19R retirement benefits finance charge | 1.8 |  |  | 2.1 |  |  | 3.0 |  |
| Profit on sale of redundant site (Note 5) | (0.4 | ) |  | (2.1 | ) |  | — |  |
| Changes to defined benefit pension plans (Note 5) | — |  |  | (0.6 | ) |  | (18.0 | ) |
| Restructuring and other expense (Note 5) | 21.6 |  |  | 2.2 |  |  | 22.4 |  |
| Other share based compensation charges | 2.2 |  |  | 1.4 |  |  | 1.3 |  |
| Impact from U.S. tax reform | (6.0 | ) |  | — |  |  | — |  |
| Income tax thereon | (3.2 | ) |  | (1.4 | ) |  | 0.9 |  |
| Adjusted net income | 27.6 |  |  | 24.7 |  |  | 29.5 |  |
| Weighted average number of £0.50 ordinary shares: |  |  |  |  |  |
| For basic earnings per share | 26,460,947 |  |  | 26,443,662 |  |  | 26,918,987 |  |
| Exercise of share options | 541,223 |  |  | 270,997 |  |  | 453,736 |  |
| For diluted earnings per share | 27,002,170 |  |  | 26,714,659 |  |  | 27,372,723 |  |
| Earnings per share using weighted average number of ordinary shares outstanding: |  |  |  |  |  |
| Basic |  |  |  |  |  |
| Adjusted | $ | 1.04 |  |  | $ | 0.93 |  |  | $ | 1.10 |  |
| Unadjusted | $ | 0.43 |  |  | $ | 0.83 |  |  | $ | 0.60 |  |
| Diluted |  |  |  |  |  |
| Adjusted | $ | 1.02 |  |  | $ | 0.92 |  |  | $ | 1.08 |  |
| Unadjusted | $ | 0.43 |  |  | $ | 0.82 |  |  | $ | 0.59 |  |

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