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Intangible assets | 12 Months Ended
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Dec. 31, 2017
Disclosure of detailed information about intangible assets [abstract] |
Intangible assets | Intangible assets
|  | Goodwill |  | Customer related |  | Technology and trading related |  | Development costs |  | Software |  | Total |
|  | $M |  | $M |  | $M |  | $M |  | $M |  | $M |
| Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| At January 1, 2016 | 83.4 |  |  | 13.4 |  |  | 9.3 |  |  | 4.0 |  |  | 3.5 |  |  | 113.6 |  |
| Additions | 0.1 |  |  | 0.1 |  |  | — |  |  | 2.4 |  |  | 0.1 |  |  | 2.7 |  |
| Disposals | — |  |  | — |  |  | — |  |  | — |  |  | (0.6 | ) |  | (0.6 | ) |
| Exchange difference | (8.2 | ) |  | — |  |  | (1.3 | ) |  | (0.4 | ) |  | (0.3 | ) |  | (10.2 | ) |
| At December 31, 2016 | 75.3 |  |  | 13.5 |  |  | 8.0 |  |  | 6.0 |  |  | 2.7 |  |  | 105.5 |  |
| Additions | — |  |  | — |  |  | — |  |  | 0.9 |  |  | 0.8 |  |  | 1.7 |  |
| Disposals | — |  |  | (0.1 | ) |  | — |  |  | — |  |  | (0.4 | ) |  | (0.5 | ) |
| Exchange difference | 4.1 |  |  | — |  |  | 0.6 |  |  | 0.5 |  |  | 0.3 |  |  | 5.5 |  |
| At December 31, 2017 | 79.4 |  |  | 13.4 |  |  | 8.6 |  |  | 7.4 |  |  | 3.4 |  |  | 112.2 |  |
| Accumulated amortization and impairment: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| At January 1, 2016 | 21.2 |  |  | 1.5 |  |  | 1.8 |  |  | 0.1 |  |  | 2.0 |  |  | 26.6 |  |
| Provided during the year | — |  |  | 0.7 |  |  | 0.4 |  |  | 0.3 |  |  | 0.3 |  |  | 1.7 |  |
| Disposals | — |  |  | — |  |  | — |  |  | — |  |  | (0.3 | ) |  | (0.3 | ) |
| Exchange difference | (2.8 | ) |  | (0.1 | ) |  | (0.3 | ) |  | 0.1 |  |  | — |  |  | (3.1 | ) |
| At December 31, 2016 | 18.4 |  |  | 2.1 |  |  | 1.9 |  |  | 0.5 |  |  | 2.0 |  |  | 24.9 |  |
| Provided during the year | — |  |  | 0.9 |  |  | 0.4 |  |  | 0.7 |  |  | 0.3 |  |  | 2.3 |  |
| Disposals | — |  |  | (0.1 | ) |  | — |  |  | — |  |  | (0.4 | ) |  | (0.5 | ) |
| Impairment | — |  |  | — |  |  | 0.5 |  |  | 1.5 |  |  | — |  |  | 2.0 |  |
| Exchange difference | 1.4 |  |  | — |  |  | 0.2 |  |  | 0.1 |  |  | 0.1 |  |  | 1.8 |  |
| At December 31, 2017 | 19.8 |  |  | 2.9 |  |  | 3.0 |  |  | 2.8 |  |  | 2.0 |  |  | 30.5 |  |
| Net book values: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| At December 31, 2017 | 59.6 |  |  | 10.5 |  |  | 5.6 |  |  | 4.6 |  |  | 1.4 |  |  | 81.7 |  |
| At December 31, 2016 | 56.9 |  |  | 11.4 |  |  | 6.1 |  |  | 5.5 |  |  | 0.7 |  |  | 80.6 |  |
| At January 1, 2016 | 62.2 |  |  | 11.9 |  |  | 7.5 |  |  | 3.9 |  |  | 1.5 |  |  | 87.0 |  |
Customer related intangibles include customer relationships, order backlogs and non-compete agreements. Technology and trading related intangibles include technology, patents, tradenames and trademarks. Development costs include $4.6 million (2016: $5.5 million) relating to internally generated intangible assets, all other intangible assets are externally generated. Impairment of intangible assets The $0.5 million impairment of technology and trading related intangibles relates to the announcement to exit of our Luxfer HEI business. The $1.5 million impairment of the development costs has resulted following the decision to discontinue our Advanced Oxygen System (AOS) product line. These impairments are both within our Gas Cylinders operating segment.

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