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Other income/ (expense) items - Schedule of other income/ (expense) items (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Profit on sale of redundant site |  |  |
Profit on sale of redundant site | $ 0.4 | $ 2.1 | $ 0.0
Changes to defined benefit pension plan |  |  |
Changes to defined benefit pension plans | 0.0 | 0.6 | 18.0
Restructuring and other expense |  |  |
Rationalization of operations | (12.1) | (0.4) | (21.8)
Patent infringement litigation costs | (3.5) | (0.6) | (0.5)
Direct listing costs | (2.3) | 0.0 | 0.0
Non-current asset impairments | (3.7) | 0.0 | 0.0
Receivable impairment provision | 0.0 | (1.2) | 0.0
I.P.O. related share based compensation charges | 0.0 | 0.0 | (0.1)
Restructuring and other expense | (21.6) | (2.2) | (22.4)
Acquisition and disposals |  |  |
Merger and acquisition costs | (0.9) | (0.3) | (2.0)
Gain on bargain purchase | 1.2 | 0.0 | 0.0
Remeasurement of deferred contingent consideration | 1.0 | 0.5 | 0.0
Acquisitions and disposals | $ 1.3 | $ 0.2 | $ (2.0)

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- Definition The amount of acquisition-related costs recognised as an expense for transactions that are recognised separately from the acquisition of assets and the assumption of liabilities in business combinations. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B64 -Subparagraph m -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B64_m&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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- Definition The amount of expense relating to restructuring. Restructuring is a programme that is planned and controlled by management and materially changes either the scope of a business undertaken by an entity or the manner in which that business is conducted. Such programmes include: (a) the sale or termination of a line of business; (b) closure of business locations in a country or region or the relocation of activities from one country or region to another; (c) changes in management structure; and (d) fundamental reorganisations that have a material effect on the nature and focus of the entity's operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of any gain recognised in a business combination in which the net of the identifiable assets acquired and the liabilities assumed exceeds the aggregate of the consideration transferred, non-controlling interest in the acquiree and fair value of the acquirer's previously held equity interest in the acquiree. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B64 -Subparagraph n -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B64_n_i&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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- Definition The gains (losses) on disposals of non-current assets. [Refer: Non-current assets] + 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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- Definition The amount of impairment loss recognised in profit or loss for trade receivables. [Refer: Impairment loss recognised in profit or loss; Trade receivables] + 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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- Definition The increase (decrease) in a contingent consideration asset (liability) relating to a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B67 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B67_b_i&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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- Definition The losses on settlements of litigation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_f&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Direct Listing Costs + References No definition available. + Details
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