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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Borrowing costs | [1] | $ 13.2 | $ 43.4 | $ 17.5
Write-off of exploration and evaluation assets - continuing operations |  | 16.9 | 30.0 | 37.7
Exploration expense |  | 49.7 | 84.4 | $ 104.2
Cost Price Property Plant And Equipment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Borrowing costs | [2] | 13.2 | 31.0 |
Gruyere Mining Company Pty Ltd [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Borrowing costs |  | 0.0 | 11.0 |
Damang Mining Fleet and Related Spare [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Borrowing costs |  | 12.1 | 20.0 |
Salares Norte project [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Borrowing costs |  | $ 1.1 | $ 0.0 |
Average interest capitalisation rate |  | 4.40% | 6.20% |
[1] | Borrowing costs capitalised of US$13.2 million (2019: US$43.4 million) comprise borrowing costs relating to general borrowings of US$13.2 million (2019: US$31.0 million) and specific borrowings of US$nil (2019: US$12.4 million). The specific borrowings of US$nil (2019: US$12.4 million) relate to the Gruyere project and are included in additions to property, plant and equipment of US$nil (2019: US$612.5 million) (refer note 14).
[2] | General borrowing costs of US$13.2 million (2019: US$31.0 million) arising on group general borrowings were capitalised during the period and comprised US$12.1 million (2019: US20.0 million) borrowings costs related to the Damang reinvestment project, US$nil (2019: US$11.0 million) borrowings costs related to the Gruyere project and US$1.1 million (2019: US$nil) related to the Salares Norte project. An average interest capitalisation rate of 4.4% (2019: 6.2%) was applied. During 2020, capitalisation of borrowing costs ceased for the Damang reinvestment project and the Gruyere project due to both projects reaching commercial levels of production. In February 2020, the Salares Norte project was approved by the Board and capital expenditure commenced in April 2020, resulting in capitalisation of borrowing costs from that date.

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- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2020-01-01 -Paragraph 26 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=23&code=ifrs-tx-2020-en-r&anchor=para_26_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of expense arising from the search for mineral resources, including minerals, oil, natural gas and similar non-regenerative resources after the entity has obtained legal rights to explore in a specific area, as well as the determination of the technical feasibility and commercial viability of extracting the mineral resource. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2020-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2020-en-r&anchor=para_24_b&doctype=Standard -URIDate 2020-01-01 + Details
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