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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2017
Classes of current inventories [abstract] |
Schedule of Inventories |
|  | December 31, 2017 |  | December 31, 2016 |
|  | $M |  | $M |
| Raw materials and consumables | 31.0 |  |  | 28.3 |  |
| Work in progress | 28.1 |  |  | 30.5 |  |
| Finished goods and goods for resale | 23.1 |  |  | 23.7 |  |
|  | 82.2 |  |  | 82.5 |  |

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- Definition Schedule of Inventory, Current1 [Table Text Block] + References No definition available. + Details
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