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Risk Management Activities - Schedule of Combined Maximum Credit Risk Exposure (Detail) - Credit risk [member] - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Environmental trust funds [member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Maximum exposure to credit risk |  | $ 79.3 | $ 69.5
Trade and other receivable [member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Maximum exposure to credit risk | [1] | 53.2 | 74.2
Loan advanced - contractor [member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Maximum exposure to credit risk |  | 68.4 | 0.0
Derivative financial assets [member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Maximum exposure to credit risk |  | 113.3 | 1.1
Cash and cash equivalent [member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Maximum exposure to credit risk |  | $ 886.8 | $ 515.0
[1] | Trade and other receivables above exclude VAT, import duties, prepayments, payroll receivables and diesel rebates amounting to US$186.9 million (2019: US$61.8 million).

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- Definition 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. + References No definition available. + Details
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- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35K_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 36 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_36_a&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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