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Related party transactions (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares American_Depositary_Shares | Dec. 31, 2017 £ / shares | Dec. 31, 2017 AUD ($) shares | Dec. 31, 2016 £ / shares | Dec. 31, 2016 AUD ($) shares American_Depositary_Shares | Dec. 31, 2015 USD ($) | Dec. 31, 2015 £ / shares
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Borrowings | $ 108,800,000 | $ 121,000,000 |  |  |  |  | $ 131,600,000 |
Par value per share (in GBP per share) | £ / shares |  |  | £ 0.50 |  | £ 0.5 |  |  | £ 0.5
Number of shares outstanding | shares | 25,929,312 |  |  | 25,929,312 |  |  |  |
Number of American Depositary Shares outstanding | American_Depositary_Shares |  | 25,180,726 |  |  |  | 25,180,726 |  |
Sub161 Pty Limited |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  | 26.40% |
Ordinary shares |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Par value per share (in GBP per share) | £ / shares |  |  | £ 0.50 |  | £ 0.50 |  |  |
Luxfer Uttam India Private Limited | Joint ventures where entity is venturer |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Investment ownership percentage | 51.00% |  |  |  |  |  |  |
Sales to related party | $ 1,900,000 | $ 1,700,000 |  |  |  |  |  |
Amounts receivable, related party transactions | 2,300,000 | 900,000 |  |  |  |  |  |
Net accounts receivable, related party transactions | $ 900,000 | 900,000 |  |  |  |  |  |
Nikkei-MEL Co. Limited | Joint ventures where entity is venturer |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Investment ownership percentage | 50.00% |  |  |  |  |  |  |
Sales to related party | $ 1,200,000 | 800,000 |  |  |  |  |  |
Luxfer Holdings NA, LLC | Joint ventures where entity is venturer |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Investment ownership percentage | 49.00% |  |  |  |  |  |  |
Sales to related party | $ 5,000,000 | 3,900,000 |  |  |  |  |  |
Debt investment provided (repayment from investment received), related party transactions | 900,000 | (1,000,000) |  |  |  |  |  |
Debt investment provided to related party | $ 10,000,000 |  |  |  |  |  |  |
Borrowings, interest rate | 8.00% |  |  | 8.00% |  |  |  |
Luxfer Holdings NA, LLC | Joint ventures where entity is venturer | Amount from trade debt |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Amounts receivable, related party transactions | $ 900,000 | 1,000,000 |  |  |  |  |  |
Luxfer Holdings NA, LLC | Joint ventures where entity is venturer | Amount from debt investment |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Amounts receivable, related party transactions | 4,700,000 | 3,800,000 |  |  |  |  |  |
Sub161 Pty Limited | Associates |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Sales to related party | $ 0 | $ 100,000 |  |  |  |  |  |
Amounts receivable, related party transactions |  |  |  | $ 0.0 |  | $ 0.1 |  |
Sub161 Pty Limited | Associates | Secured loan note |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Borrowings, interest rate | 6.00% |  |  | 6.00% |  |  |  |
Sub161 Pty Limited | Associates | Secured loan note | Gross carrying amount |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Borrowings | $ 0 |  |  |  |  |  |  |
Sub161 Pty Limited | Associates | Secured loan note | Unamortized finance costs |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Borrowings | $ 500,000 |  |  |  |  |  |  |
Directors and key management | Ordinary shares |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Number of shares outstanding | shares | 170,297 | 1,062,672 |  | 170,297 |  | 1,062,672 |  |
Number of shares award held over | shares | 316,797 | 476,839 |  | 316,797 |  | 476,839 |  |
Stone Canyon Industries LLC |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Number of American Depositary Shares outstanding | shares |  | 570,000 |  |  |  | 570,000 |  |
Stone Canyon Industries LLC | Ordinary shares |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Number of shares outstanding | shares | 570,000 |  |  | 570,000 |  |  |  |
FTI Consulting [Member] |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Services received, related party transactions | $ 100,000 | $ 0 |  |  |  |  |  |
Cherokee Properties Inc. |  |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |  |
Leases as lessee, related party transactions | $ 1,000,000 | $ 1,000,000 |  |  |  |  |  |

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