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Investments - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of financial assets [line items] |  |  |
Investments | $ 7,600,000 | $ 10,000,000 |
Investment impairment | 2,200,000 | 0 | $ 4,600,000
Carrying value of investments based on net realizable value of assets secured | 1,600,000 |  |
Draws on line of credit facility | 108,800,000 | 121,000,000 | 131,600,000
Share of results of joint ventures and associates | 100,000 | 500,000 | $ (1,200,000)
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax | 0 | 0 |
Increase (decrease) through net exchange differences, other provisions |  | (200,000) |
Loan Investments |  |  |
Disclosure of financial assets [line items] |  |  |
Investment impairment | 2,200,000 |  |
Joint Ventures | Loan Investments |  |  |
Disclosure of financial assets [line items] |  |  |
Investments | $ 4,700,000 |  |
Borrowings, interest rate | 8.00% |  |
Joint Ventures | Equity investments |  |  |
Disclosure of financial assets [line items] |  |  |
Share of results of joint ventures and associates | $ 100,000 | 500,000 |
Luxfer Holdings NA, LLC |  |  |
Disclosure of financial assets [line items] |  |  |
Commitments in relation to joint ventures | 12,500,000 |  |
Commitments in relation to joint ventures, equity | 2,500,000 |  |
Line of credit facility, maximum borrowing capacity | 10,000,000.0 |  |
Draws on line of credit facility | $ 4,700,000 | $ 3,800,000 |
Sub161 Pty Limited |  |  |
Disclosure of financial assets [line items] |  |  |
Proportion of voting rights and shares held | 26.40% |  | 26.40%
Cash transferred |  |  | $ 3,700,000
Other tangible or intangible assets transferred |  |  | $ 1,700,000
Associates | Loan Investments |  |  |
Disclosure of financial assets [line items] |  |  |
Investments | $ 1,600,000 |  |
Borrowings, interest rate | 6.00% |  |

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