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The Luxfer Group Employee Share Ownership Plan (Details) | 12 Months Ended |  |  |
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Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2017 £ / shares | Dec. 31, 2016 £ / shares | Dec. 31, 2015 USD ($) | Dec. 31, 2015 £ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Number of share options outstanding, beginning balance (in shares) | 963,789 | 1,144,534 |  |  |  |
Shares utilized during the year | 172,501 | 132,599 |  |  |  |
Shares transferred into ESOP during the year | 386,614 | 107,660 |  |  |  |
Number of share options outstanding, ending balance (in shares) | 1,182,315 | 963,789 |  |  |  |
Bank and other loans | $ | $ 108,800,000 | $ 121,000,000 |  |  | $ 131,600,000 |
Par value per share (in GBP per share) | £ / shares |  |  | £ 0.50 | £ 0.5 |  | £ 0.5
Market value of options | $ | $ 9.82 | $ 9.39 |  |  |  |
Deferred shares |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Par value per share (in GBP per share) | £ / shares |  |  | 0.0001 |  |  |
Ordinary shares |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Par value per share (in GBP per share) | £ / shares |  |  | £ 0.50 | £ 0.50 |  |
Number of shares held by ESOP Trustees | Deferred shares |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Number of share options outstanding, beginning balance (in shares) | 15,977,968,688 |  |  |  |  |
Shares utilized during the year | 0 |  |  |  |  |
Shares transferred into ESOP during the year | 0 |  |  |  |  |
Number of share options outstanding, ending balance (in shares) | 15,977,968,688 | 15,977,968,688 |  |  |  |
Number of shares held by ESOP Trustees | Ordinary shares |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Number of share options outstanding, beginning balance (in shares) | 55,816 |  |  |  |  |
Shares utilized during the year | (34,594) |  |  |  |  |
Shares transferred into ESOP during the year | 83,487 |  |  |  |  |
Number of share options outstanding, ending balance (in shares) | 104,709 | 55,816 |  |  |  |
ESOP |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Bank and other loans | $ | $ 2,600,000 | $ 2,600,000 |  |  |  |
Market value of options | $ | $ 15.80 | $ 10.89 |  |  |  |

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