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Deferred income taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Income Tax [Abstract] |
Reconciliation of changes in deferred tax liability (asset) |
|  | Accelerated tax depreciation |  | Other temporary differences |  | Tax losses |  | Retirement benefit obligations |  | Total |
|  | $M |  | $M |  | $M |  | $M |  | $M |
| At January 1, 2016 | (11.0 | ) |  | 5.1 |  |  | 4.7 |  |  | 13.3 |  |  | 12.1 |  |
| Credited/(charged) to consolidated income statement | 0.1 |  |  | (2.1 | ) |  | 0.9 |  |  | (1.2 | ) |  | (2.3 | ) |
| Credited to other comprehensive income | — |  |  | — |  |  | — |  |  | 4.3 |  |  | 4.3 |  |
| Exchange difference | — |  |  | (0.2 | ) |  | (0.5 | ) |  | (1.7 | ) |  | (2.4 | ) |
| At December 31, 2016 | (10.9 | ) |  | 2.8 |  |  | 5.1 |  |  | 14.7 |  |  | 11.7 |  |
| Credited/(charged) to consolidated income statement | 5.2 |  |  | (1.0 | ) |  | — |  |  | 0.6 |  |  | 4.8 |  |
| Charged to other comprehensive income | — |  |  | (0.6 | ) |  | — |  |  | (5.2 | ) |  | (5.8 | ) |
| Credited to equity | — |  |  | 0.6 |  |  | — |  |  | — |  |  | 0.6 |  |
| Exchange difference | — |  |  | 0.2 |  |  | 0.3 |  |  | 0.8 |  |  | 1.3 |  |
| At December 31, 2017 | (5.7 | ) |  | 2.0 |  |  | 5.4 |  |  | 10.9 |  |  | 12.6 |  |
Schedule of deferred income tax assets and liabilities | The amount of deferred income taxes accounted for in the Group balance sheet, after the offset of balances within countries for financial reporting purposes, comprised the following deferred income tax assets and liabilities:
|  | December 31, 2017 |  | December 31, 2016 |
|  | $M |  | $M |
| Deferred income tax liabilities | (3.6 | ) |  | (4.9 | ) |
| Deferred income tax assets | 16.2 |  |  | 16.6 |  |
| Net deferred income tax assets | 12.6 |  |  | 11.7 |  |

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- Definition The disclosure of types of temporary differences, unused tax losses and unused tax credits. [Refer: Unused tax credits [member]; Unused tax losses [member]; Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g&doctype=Standard -URIDate 2017-03-09 + Details
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