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Investments - Summary of Investments (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Listed |  |
Cost | $ 143.0 | $ 62.9
Less: Accumulated impairments | (45.5) | (45.0)
Net unrealised loss on revaluation | (8.1) | (7.4)
Translation adjustment | 9.6 | 0.0
Carrying value | 99.0 | 10.5
Market value | 99.0 | 10.5
Unlisted |  |
Carrying value at cost | 0.1 | 3.3
Derivative instruments |  |
Total investments | 104.6 | 19.7
Warrant [Member] |  |
Derivative instruments |  |
Warrants | $ 5.5 | $ 5.9

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- Definition The amount of aggregate adjustments to the carrying amounts reported under previous GAAP of investments in subsidiaries, joint ventures or associates in the entity's first IFRS financial statements. [Refer: Associates [member]; Carrying amount [member]; Joint ventures [member]; Previous GAAP [member]; Subsidiaries [member]; Investments in subsidiaries, joint ventures and associates; IFRSs [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2017-01-01 -Paragraph 31 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=1&date=2017-03-01&anchor=para_31_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of impairment loss recognised in other comprehensive income. Impairment loss on a revalued asset is recognised in other comprehensive income to the extent that the impairment loss does not exceed the amount in the revaluation surplus for that same asset. [Refer: Impairment loss; Revaluation surplus; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 126 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_126_c&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 129 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_129_a&doctype=Standard -URIDate 2017-03-09 + Details
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