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Reserves (Tables) | 12 Months Ended
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Dec. 31, 2017
Share Capital, Reserves And Other Equity Interest [Abstract] |
Disclosure of reserves within equity |
|  | Retained earnings |  | Hedging reserve |  | Translation reserve |  | Share based compensation reserve |  | Merger reserve |
|  | $M |  | $M |  | $M |  | $M |  | $M |
| At January 1, 2015 | 308.8 |  |  | 0.9 |  |  | (36.2 | ) |  | 3.7 |  |  | (333.8 | ) |
| Net income for the year | 16.1 |  |  | — |  |  | — |  |  | — |  |  | — |  |
| Currency translation differences | — |  |  | — |  |  | (8.6 | ) |  | — |  |  | — |  |
| Decrease in fair value of cash flow hedges | — |  |  | (5.4 | ) |  | — |  |  | — |  |  | — |  |
| Transfer to consolidated income statement on cash flow hedges | — |  |  | (0.1 | ) |  | — |  |  | — |  |  | — |  |
| Remeasurement of defined benefit retirement plans | 4.4 |  |  | — |  |  | — |  |  | — |  |  | — |  |
| Deferred income taxes on items taken to other comprehensive income | (1.5 | ) |  | 1.1 |  |  | — |  |  | — |  |  | — |  |
| Equity dividends | (10.8 | ) |  | — |  |  | — |  |  | — |  |  | — |  |
| Equity settled share based compensation charges | — |  |  | — |  |  | — |  |  | 1.4 |  |  | — |  |
| Cash settled share based compensation charges | — |  |  | — |  |  | — |  |  | (0.5 | ) |  | — |  |
| Deferred income taxes on items taken to equity | (0.3 | ) |  | — |  |  | — |  |  | — |  |  | — |  |
| Utilization of treasury shares | (0.1 | ) |  | — |  |  | — |  |  | (0.5 | ) |  | — |  |
| At December 31, 2015 | 316.6 |  |  | (3.5 | ) |  | (44.8 | ) |  | 4.1 |  |  | (333.8 | ) |
| Net income for the year | 21.9 |  |  | — |  |  | — |  |  | — |  |  | — |  |
| Currency translation differences | — |  |  | — |  |  | (13.1 | ) |  | — |  |  | — |  |
| Increase in fair value of cash flow hedges | — |  |  | 1.1 |  |  | — |  |  | — |  |  | — |  |
| Transfer to consolidated income statement on cash flow hedges | — |  |  | (0.9 | ) |  | — |  |  | — |  |  | — |  |
| Remeasurement of defined benefit retirement plans | (21.7 | ) |  | — |  |  | — |  |  | — |  |  | — |  |
| Deferred income taxes on items taken to other comprehensive income | 4.3 |  |  | — |  |  | — |  |  | — |  |  | — |  |
| Equity dividends | (13.3 | ) |  | — |  |  | — |  |  | — |  |  | — |  |
| Equity settled share based compensation charges | — |  |  | — |  |  | — |  |  | 1.2 |  |  | — |  |
| Utilization of treasury shares | 0.1 |  |  | — |  |  | — |  |  | (0.6 | ) |  | — |  |
| Utilization of ESOP shares | 0.2 |  |  | — |  |  | — |  |  | (0.9 | ) |  | — |  |
| At December 31, 2016 | 308.1 |  |  | (3.3 | ) |  | (57.9 | ) |  | 3.8 |  |  | (333.8 | ) |
| Net income for the year | 11.5 |  |  | — |  |  | — |  |  | — |  |  | — |  |
| Currency translation differences | — |  |  | — |  |  | 11.6 |  |  | — |  |  | — |  |
| Increase in fair value of cash flow hedges | — |  |  | 3.1 |  |  | — |  |  | — |  |  | — |  |
| Transfer to consolidated income statement on cash flow hedges | — |  |  | 0.6 |  |  | — |  |  | — |  |  | — |  |
| Remeasurement of defined benefit retirement plans | 9.5 |  |  | — |  |  | — |  |  | — |  |  | — |  |
| Deferred income taxes on items taken to other comprehensive income | (5.2 | ) |  | (0.6 | ) |  | — |  |  | — |  |  | — |  |
| Equity dividends | (13.3 | ) |  | — |  |  | — |  |  | — |  |  | — |  |
| Equity settled share based compensation charges | — |  |  | — |  |  | — |  |  | 2.6 |  |  | — |  |
| Utilization of treasury shares | 0.1 |  |  | — |  |  | — |  |  | (0.6 | ) |  | — |  |
| Utilization of ESOP shares | 0.1 |  |  | — |  |  | — |  |  | (0.4 | ) |  | — |  |
| Deferred income taxes on items taken to equity | 0.6 |  |  | — |  |  | — |  |  | — |  |  | — |  |
| At December 31, 2017 | 311.4 |  |  | (0.2 | ) |  | (46.3 | ) |  | 5.4 |  |  | (333.8 | ) |

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