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Related-Party Transactions (Details) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2018 £ / shares | Dec. 31, 2018 AUD ($) shares | Dec. 28, 2018 | Dec. 31, 2017 £ / shares | Dec. 31, 2017 AUD ($) shares | Dec. 31, 2015
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Percentage of share capital acquired |  |  |  |  |  |  |  | 26.40%
FTI Consulting | President |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party transaction, amounts of transaction |  | $ 100,000 |  |  |  |  |  |
Luxfer Uttam India Private Limited | Equity Method Investee |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 51.00% |  |  | 51.00% |  |  |  |
Accounts receivable, related parties | $ 1,100,000 | 2,300,000 |  |  |  |  |  |
Related party transaction, net amounts receivable | $ 900,000 | 900,000 |  |  |  |  |  |
Nikkei-MEL Co. Limited | Equity Method Investee |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  | 50.00% |  |  |  |
Luxfer Holdings NA, LLC | Equity Method Investee |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 49.00% |  |  | 49.00% |  |  |  |
Accounts receivable, related parties | $ 0 | 900,000 |  |  |  |  |  |
Related party transaction, net amounts receivable | 0 | 4,700,000 |  |  |  |  |  |
Debt investments amount | 0 | 900,000 |  |  |  |  |  |
Cherokee Properties Inc. | President |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party transaction, amounts of transaction | 1,000,000 | 1,000,000 |  |  |  |  |  |
Gas Cylinders | Luxfer Uttam India Private Limited | Equity Method Investee |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Sales to related parties | 1,700,000 | 1,900,000 |  |  |  |  |  |
Related party transaction, amounts of transaction | 1,600,000 | 0 |  |  |  |  |  |
Gas Cylinders | Luxfer Holdings NA, LLC | Equity Method Investee |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Sales to related parties | 600,000 | 5,000,000 |  |  |  |  |  |
Interest income from related party | 400,000 | 300,000 |  |  |  |  |  |
Elektron | Nikkei-MEL Co. Limited | Equity Method Investee |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Sales to related parties | $ 900,000 | $ 1,200,000 |  |  |  |  |  |
Ordinary shares |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Common stock, par value (in GBP per share) | £ / shares |  |  | £ 0.50 |  |  | £ 0.50 |  |
Ordinary shares | Executive Leadership Team |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of common stock owned by related parties (in shares) | shares | 237,161 | 170,297 |  | 237,161 |  |  | 170,297 |
Number of awards held by related parties (in shares) | shares | 600,528 | 316,797 |  | 600,528 |  |  | 316,797 |
Ordinary shares | Stone Canyon Industries LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Number of common stock owned by related parties (in shares) | shares | 0 | 570,000 |  | 0 |  |  | 570,000 |
Luxfer Holdings NA, LLC |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Percentage of share capital acquired |  |  |  |  | 51.00% |  |  |
Sub161 Pty Limited | Equity Method Investee |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Sales to related parties | $ 0 | $ 0 |  |  |  |  |  |
Accounts receivable, related parties |  |  |  | $ 0 |  |  | $ 0 |

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