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Other income/ (expense) items - Schedule of other income/ (expense) items (Details) - USD ($) $ in Millions	12 Months Ended
	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)

X

- 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

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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.

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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]]

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- Definition

The gains (losses) on disposals of non-current assets. [Refer: Non-current assets]

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The amount of impairment loss recognised in profit or loss for trade receivables. [Refer: Impairment loss recognised in profit or loss; Trade receivables]

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The increase (decrease) in a contingent consideration asset (liability) relating to a business combination.

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The losses on settlements of litigation.

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Acquisition And Disposals [Abstract]

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Direct Listing Costs

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Expense Of Restructuring Activities And Other

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Impairments Loss on Non-Current Asset

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Nonoperating Income (Expense), Acquisition And Disposals

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Profit (Loss) From Operating Activities, Changes To Defined Benefit Pension Plan

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Restructuring And Other Expense [Abstract]

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Share Based Compensation Charges Related To Initial Public Offering

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