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Finance income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Analysis of income and expense [abstract]
Bank interest received	$ 0.2	$ 0.2	$ 0.2
Other interest received	0.3	0.3	0.3
Foreign exchange gains on financing activities	0.0	0.7	0.0
Total finance income	$ 0.5	$ 1.2	$ 0.5

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- References

No definition available.

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- Definition

The amount of income associated with interest and other financing activities of the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
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- Definition

The amount of interest income on loans and advances to banks. [Refer: Interest income; Loans and advances to banks]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of interest income on other financial assets. [Refer: Interest income; Other financial assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
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Net Foreign Exchange Gain On Financing Activities

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No definition available.

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