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The Luxfer Group Employee Share Ownership Plan (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Payment Arrangements [Abstract] |
Disclosure of movement in the number of ESOP share options | The movement in the number of shares held by the Trustees of the ESOP and the number of share options held over those shares are shown below:
|  | Number of shares held by ESOP Trustees |
|  | £0.0001 deferred shares |  | £0.50 ordinary shares |
| At January 1, 2017 | 15,977,968,688 |  |  | 55,816 |  |
| Shares utilized during the year | — |  |  | (34,594 | ) |
| Shares transferred into ESOP during the year | — |  |  | 83,487 |  |
| At December 31, 2017 | 15,977,968,688 |  |  | 104,709 |  |
The following table illustrates the number of, and movements in, share options during the year, with each option relating to 1 ordinary share:
|  | 2017 |  | 2017 |  | 2016 |  | 2016 |
|  | Number |  | Weighted average exercise price |  | Number |  | Weighted average exercise price |
| At January 1 | 963,789 |  |  | $8.51 |  | 1,144,534 |  |  | $7.26 |
| Granted during the year | 386,614 |  |  | $0.65 |  | 107,660 |  |  | $0.67 |
| Exercised during the year | (172,501 | ) |  | $(5.03) |  | (132,599 | ) |  | $(0.67) |
| Accrued dividend awards | 12,258 |  |  | $0.65 |  | 12,572 |  |  | $0.67 |
| Lapsed during the year | (7,845 | ) |  | $(0.65) |  | (168,378 | ) |  | $(0.67) |
| At December 31 | 1,182,315 |  |  | $6.42 |  | 963,789 |  |  | $8.51 |

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- Definition The disclosure of the number and weighted average exercise prices of share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Share-based Payment Arrangements [Abstract] + References No definition available. + Details
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