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Staff Costs - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Analysis of income and expense [abstract] |  |  |
Key management personnel compensation, short-term employee benefits | $ 4.7 | $ 2.2 | $ 2.6
Key management personnel compensation, post-employment benefits | 0.3 | 0.2 | 0.4
Key management personnel compensation, social security costs | 0.5 | 0.3 | 0.4
Disclosure of transactions between related parties [line items] |  |  |
Capital expenditure: Property, plant and equipment | 9.6 | 16.5 | 15.3
Sales of property | $ 0.1 | $ 0.4 | $ 0.0

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