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Share based compensation - Components of Share Based Compensation Charges (Details) - USD ($) $ in Millions	12 Months Ended
	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.

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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
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-IssueDate 2017-01-01
-Paragraph 112
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-URIDate 2017-03-09

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