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Lease Liabilities - Summary of Finance Lease Liabilities (Parenthetical) (Detail) - IFRS 16 [member] - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2020 | Jan. 01, 2019
Disclosure of finance lease liabilities [line items] |  |
Discussion of impact that initial application of ifrs is expected to recognise right of use assets and practical expedients | On transition to IFRS 16, the Group elected to recognise the right-of-use assets at an amount equal to the lease liability at 1 January 2019 and applied the following practical expedients: • Relying on previous assessments on whether leases are onerous as an alternative to performing an impairment review. There were no onerous contracts as at 1 January 2019; and • Accounting for operating leases with a remaining lease term of less than 12 months as at 1 January 2019 as short-term leases. |
Onerous contracts |  | $ 0.0
Statement that lessee accounts for short-term leases using recognition exemption | Accounting for operating leases with a remaining lease term of less than 12 months as at 1 January 2019 as short-term leases. |
Additional right of use assets and lease liabilities |  | $ 209.6

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- Definition Additional right of use assets and lease liabilities. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Disclosure of finance lease liabilities [line items] + References No definition available. + Details
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- Definition DiscussionOoof impact that initial application of IFRS is expected to recognise right of use assets and practical expedients. + References No definition available. + Details
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- Definition The amount of provision for onerous contracts. An onerous contract is a contract in which the unavoidable costs of meeting the obligation under the contract exceed the economic benefits expected to be received under it. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_66&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The statement that the lessee accounts for short-term leases using the recognition exemption in paragraph 6 of IFRS 16. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 60 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_60&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | na
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- Details
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