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Impairment of goodwill - Narrative (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) segment cash_generating_unit | Dec. 31, 2017 | Dec. 31, 2017 $ / € | Dec. 31, 2017 $ / £ | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |  |
Number of cash generating units | cash_generating_unit | 6 |  |  |  |  |
Number of reportable segments | segment | 2 |  |  |  |  |
Goodwill | $ 59.6 |  |  |  | $ 56.9 | $ 62.2
Growth rate used to extrapolate cash flow projections |  | 2.10% |  |  | 2.10% |
Exchange rate applied to cash flow projections (in USD per GBP and EUR per USD) |  |  | 1.19 | 1.35 |  |
Minimum |  |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |  |
Discount rate applied to cash flow projections |  | 8.50% |  |  | 10.10% |
Maximum |  |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |  |
Discount rate applied to cash flow projections |  | 10.90% |  |  | 10.70% |
Gas Cylinders |  |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |  |
Goodwill | 20.5 |  |  |  | $ 18.9 | 22.3
Gas Cylinders | Luxfer Gas Cylinders |  |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |  |
Goodwill | 19.5 |  |  |  | 17.9 |
Gas Cylinders | Superform |  |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |  |
Goodwill | 1.0 |  |  |  | 1.0 |
Elektron |  |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |  |
Goodwill | 39.1 |  |  |  | 38.0 | $ 39.9
Luxfer MEI Technologies operations |  |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |  |
Goodwill | 5.4 |  |  |  | 3.9 |
Luxfer Magtech operations |  |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |  |
Goodwill | $ 33.7 |  |  |  |  |
Magnesium Elektron operations |  |  |  |  |  |
Disclosure of impairment loss recognised or reversed [line items] |  |  |  |  |  |
Goodwill |  |  |  |  | $ 34.1 |

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