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Property, plant and equipment (Tables) | 12 Months Ended
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Dec. 31, 2017
Property, plant and equipment [abstract] |
Schedule of property, plant and equipment | The rate of annual charge is summarized as follows:
| Freehold buildings | 3% – 10% |
| Leasehold land and buildings | The lesser of life of lease or freehold rate |
| Plant and equipment | 4% – 30% |
| Including: |  |
| Heavy production equipment (including casting, rolling, extrusion and press equipment) | 4% – 6% |
| Chemical production plant and robotics | 10% – 15% |
| Other production machinery | 10% – 20% |
| Furniture, fittings, storage and equipment | 10% – 30% |
|  | Freehold |  | Long leasehold |  | Short leasehold |  | Plant and equipment |  | Total |
|  | $M |  | $M |  | $M |  | $M |  | $M |
| Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| At January 1, 2016 | 56.1 |  |  | 6.4 |  |  | 10.3 |  |  | 314.6 |  |  | 387.4 |  |
| Additions | 1.9 |  |  | 0.6 |  |  | 0.5 |  |  | 13.5 |  |  | 16.5 |  |
| Disposals | (3.8 | ) |  | — |  |  | — |  |  | (23.0 | ) |  | (26.8 | ) |
| Transfers | 3.8 |  |  | (0.2 | ) |  | — |  |  | (3.6 | ) |  | — |  |
| Exchange difference | (1.6 | ) |  | (0.9 | ) |  | (0.3 | ) |  | (25.3 | ) |  | (28.1 | ) |
| At December 31, 2016 | 56.4 |  |  | 5.9 |  |  | 10.5 |  |  | 276.2 |  |  | 349.0 |  |
| Additions | 0.9 |  |  | 0.3 |  |  | 0.9 |  |  | 7.1 |  |  | 9.2 |  |
| Acquired via acquisition | 2.0 |  |  | — |  |  | — |  |  | 3.2 |  |  | 5.2 |  |
| Disposals | (0.1 | ) |  | (0.1 | ) |  | — |  |  | (4.7 | ) |  | (4.9 | ) |
| Exchange difference | 3.2 |  |  | 0.1 |  |  | 0.8 |  |  | 14.2 |  |  | 18.3 |  |
| At December 31, 2017 | 62.4 |  |  | 6.2 |  |  | 12.2 |  |  | 296.0 |  |  | 376.8 |  |
| Accumulated depreciation and impairment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| At January 1, 2016 | 20.1 |  |  | 3.9 |  |  | 4.7 |  |  | 222.7 |  |  | 251.4 |  |
| Provided during the year | 2.0 |  |  | 0.3 |  |  | 0.8 |  |  | 13.6 |  |  | 16.7 |  |
| Disposals | (2.8 | ) |  | — |  |  | — |  |  | (22.8 | ) |  | (25.6 | ) |
| Transfers | 7.9 |  |  | (0.5 | ) |  | 0.2 |  |  | (7.6 | ) |  | — |  |
| Exchange difference | (0.6 | ) |  | (0.6 | ) |  | (0.2 | ) |  | (20.0 | ) |  | (21.4 | ) |
| At December 31, 2016 | 26.6 |  |  | 3.1 |  |  | 5.5 |  |  | 185.9 |  |  | 221.1 |  |
| Provided during the year | 2.2 |  |  | 0.3 |  |  | 0.9 |  |  | 13.3 |  |  | 16.7 |  |
| Disposals | (0.1 | ) |  | (0.1 | ) |  | — |  |  | (4.5 | ) |  | (4.7 | ) |
| Impairment | 2.5 |  |  | — |  |  | — |  |  | 2.5 |  |  | 5.0 |  |
| Exchange difference | 1.3 |  |  | 0.2 |  |  | 0.3 |  |  | 11.4 |  |  | 13.2 |  |
| At December 31, 2017 | 32.5 |  |  | 3.5 |  |  | 6.7 |  |  | 208.6 |  |  | 251.3 |  |
| Net book values: |  |  |  |  |  |  |  |  |  |  |  |  |  |
| At December 31, 2017 | 29.9 |  |  | 2.7 |  |  | 5.5 |  |  | 87.4 |  |  | 125.5 |  |
| At December 31, 2016 | 29.8 |  |  | 2.8 |  |  | 5.0 |  |  | 90.3 |  |  | 127.9 |  |
| At January 1, 2016 | 36.0 |  |  | 2.5 |  |  | 5.6 |  |  | 91.9 |  |  | 136.0 |  |

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- Definition The disclosure of detailed information about property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73&doctype=Standard -URIDate 2017-03-09 + Details
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