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Investments (Tables) | 12 Months Ended
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Dec. 31, 2017
Financial Instruments [Abstract] |
Schedule of Joint Ventures and Associates |
|  | Shares in joint ventures |  | Loans to joint ventures and associates |  | Total |
|  | $M |  | $M |  | $M |
| At January 1, 2016 | 2.4 |  |  | 4.8 |  |  | 7.2 |  |
| Debt funding | — |  |  | (1.0 | ) |  | (1.0 | ) |
| Transfer from trade receivables | — |  |  | 3.7 |  |  | 3.7 |  |
| Share of results | 0.5 |  |  | — |  |  | 0.5 |  |
| Exchange difference | (0.2 | ) |  | (0.2 | ) |  | (0.4 | ) |
| At December 31, 2016 | 2.7 |  |  | 7.3 |  |  | 10.0 |  |
| Debt funding | — |  |  | 0.9 |  |  | 0.9 |  |
| Share of results | 0.1 |  |  | — |  |  | 0.1 |  |
| Impairment | — |  |  | (2.2 | ) |  | (2.2 | ) |
| Exchange difference | 0.1 |  |  | 0.3 |  |  | 0.4 |  |
| At December 31, 2017 | 2.9 |  |  | 6.3 |  |  | 9.2 |  |
At December 31, 2017, the Group had the following joint ventures and associates which affect the profit of the Group. Unless otherwise stated, the Group's joint ventures and associates have share capital which consists solely of ordinary shares and are indirectly held, and the country of incorporation or registration is also their principal place of operation.
| Name of company |  | Country of incorporation |  | Holding |  | Proportion of voting rights and shares held |  | Classification |  | Nature of business |
| Dynetek Cylinders India Private Limited |  | India |  | Ordinary shares |  | 49 | % |  | Joint venture |  | Engineering |
| Dynetek Korea Co. Limited |  | South Korea |  | Ordinary shares |  | 49 | % |  | Joint venture |  | Engineering |
| Luxfer Holdings NA, LLC |  | U.S. |  | Membership interest |  | 49 | % |  | Joint venture |  | Engineering |
| Luxfer Uttam India Private Limited |  | India |  | Ordinary shares |  | 51 | % |  | Joint venture |  | Engineering |
| Nikkei-MEL Co. Limited |  | Japan |  | Ordinary shares |  | 50 | % |  | Joint venture |  | Distribution |
| Sub161 Pty Limited |  | Australia |  | Ordinary shares |  | 26.4 | % |  | Associate |  | Engineering |

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