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Finance costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Analysis of income and expense [abstract]
Bank and other loan interest payable	$ 6.3	$ 6.3	$ 6.5
Amortization of issue costs	0.6	0.5	0.9
Foreign exchange loss on financing activities	0.3	0.0	0.0
IAS 19R retirement benefits finance charge	1.8	2.1	3.0
Unwind of discount on deferred contingent consideration from acquisitions	0.2	0.4	0.4
Total finance costs	$ 9.2	$ 9.3	$ 10.8

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- References

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The amount of expense recognised due to the unwinding of the discount on provisions, resulting from the effect of the passage of time. [Refer: Other provisions]

+ References

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

The amount of costs associated with financing activities of the entity.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The increase (decrease) in liabilities arising from financing activities resulting from the effect of changes in foreign exchange rates. [Refer: Liabilities arising from financing activities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of interest expense on bank loans and overdrafts. [Refer: Interest expense; Bank overdrafts]

+ References

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-IssueDate 2017-01-01
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Amortisation Of Financing Costs

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IAS 19R Retirement Benefits Finance Charge

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