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Provisions - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure of other provisions [line items] |  |  |
Provisions | $ 3.9 | $ 2.6 | $ 5.3
Rationalization and redundancy |  |  |
Disclosure of other provisions [line items] |  |  |
Provisions | 2.1 | 0.8 | 2.6
Rationalization and redundancy | Gas Cylinders |  |  |
Disclosure of other provisions [line items] |  |  |
Provisions | 0.8 | 0.5 |
Rationalization and redundancy | Elektron |  |  |
Disclosure of other provisions [line items] |  |  |
Provisions | 1.3 | 0.3 |
Rationalization and redundancy | Elektron | United Kingdom |  |  |
Disclosure of other provisions [line items] |  |  |
Provisions | 0.2 |  |
Rationalization and redundancy | Elektron | U.S. |  |  |
Disclosure of other provisions [line items] |  |  |
Provisions | 0.1 |  |
Rationalization of Magtech operations | Elektron |  |  |
Disclosure of other provisions [line items] |  |  |
Provisions | 0.5 |  |
Onerous contracts provision | Elektron |  |  |
Disclosure of other provisions [line items] |  |  |
Provisions | 0.6 |  |
Employee benefits |  |  |
Disclosure of other provisions [line items] |  |  |
Provisions | 1.1 | 1.1 | 1.5
Environmental provisions |  |  |
Disclosure of other provisions [line items] |  |  |
Provisions | 0.7 | $ 0.7 | $ 1.2
Speciality Metals business of ESM Group Inc | Environmental provisions |  |  |
Disclosure of other provisions [line items] |  |  |
Provisions | $ 0.4 |  |

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- Definition The amount of liabilities of uncertain timing or the amount recognised when: (a) the entity has a present obligation (legal or constructive) as a result of a past event; (b) it is probable (ie more likely than not) that an outflow of resources embodying economic benefits will be required to settle the obligation; and (c) a reliable estimate can be made of the amount of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph l -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_l&doctype=Standard -URIDate 2017-03-09 + Details
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