Financial Assets and Liabilities - Summary of Changes in Fair Value of Level 3 Instruments (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Level 3
Disclosure Of Financial Instruments [Line Items]
Gain loss on re-measurement of contingent consideration provision	$ (10.5)	$ 0.1

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

No definition available.

Name:	ifrs-full_DisclosureOfFinancialInstrumentsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration