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Share based compensation - Components of Share Based Compensation Charges (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share based compensation charges (Note 31) | $ 3.1 | $ 1.4 | $ 1.4
I.P.O. related share based compensation charges |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share based compensation charges (Note 31) | 0.0 | 0.0 | 0.1
Other share based compensation charges |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share based compensation charges (Note 31) | 2.2 | 1.4 | 1.3
Restructuring share based compensation charges |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Share based compensation charges (Note 31) | $ 0.9 | $ 0.0 | $ 0.0

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of expense from share-based payment transactions with employees. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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