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Income taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Taxes [Abstract] |
Analysis of taxation charge for the year | Analysis of taxation charge for the year
|  | 2017 |  | 2016 |  | 2015 |
|  | $M |  | $M |  | $M |
| Current income taxes: |  |  |  |  |  |
| U.K. corporation tax | — |  |  | — |  |  | 0.3 |  |
| Adjustments in respect of previous years | (0.3 | ) |  | 0.2 |  |  | (0.4 | ) |
|  | (0.3 | ) |  | 0.2 |  |  | (0.1 | ) |
| Non-U.K. tax | 6.3 |  |  | 3.5 |  |  | 7.2 |  |
| Adjustments in respect of previous years | (0.8 | ) |  | — |  |  | (0.9 | ) |
| Total current tax charge | 5.2 |  |  | 3.7 |  |  | 6.2 |  |
| Deferred income taxes: |  |  |  |  |  |  |  |  |
| Origination and reversal of temporary differences | (5.3 | ) |  | 2.1 |  |  | 2.7 |  |
| Adjustments in respect of previous years | 0.5 |  |  | 0.2 |  |  | 0.6 |  |
| Total deferred income taxes (credit) / charge | (4.8 | ) |  | 2.3 |  |  | 3.3 |  |
| Tax on profit on operations | 0.4 |  |  | 6.0 |  |  | 9.5 |  |
Factors affecting the taxation charge for the year | The differences are explained below:
|  | 2017 |  | 2016 |  | 2015 |
|  | $M |  | $M |  | $M |
| Profit on operations before taxation | 11.9 |  |  | 27.9 |  |  | 25.6 |  |
| Profit on operations at 2017 standard rate of corporation tax in the U.K. of 19.25% (2016: 20% and 2015: 20.25%) | 2.3 |  |  | 5.6 |  |  | 5.2 |  |
| Effects of: |  |  |  |  |  |  |  |  |
| (Income not taxable) / non-deductible expenses | 0.1 |  |  | 0.2 |  |  | 2.4 |  |
| Unprovided deferred income taxes | 0.3 |  |  | (2.9 | ) |  | — |  |
| Foreign tax rate differences | 4.3 |  |  | 2.7 |  |  | 2.6 |  |
| Effect of U.S. tax reform | (6.0 | ) |  | — |  |  | — |  |
| Adjustment in respect of previous years | (0.6 | ) |  | 0.4 |  |  | (0.7 | ) |
| Tax expense | 0.4 |  |  | 6.0 |  |  | 9.5 |  |

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