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Deferred Taxation - Schedule of Detailed Components of Net Deferred Taxation Liability (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Liabilities |  |
Liabilities | $ 1,069.2 | $ 1,053.1
Assets |  |
Assets | (809.3) | (885.0)
Unrealised loss on financial instruments | (7.4) | (38.3)
Net deferred taxation liabilities | 259.9 | 168.1
Included in the statement of financial position as follows: |  |
Deferred taxation assets | (240.0) | (265.5)
Deferred taxation liabilities | 499.9 | 433.6
Net deferred taxation liabilities | 259.9 | 168.1
Balance at beginning of the year | 168.1 | 185.4
Recognised in profit or loss - continuing operations | 66.0 | (15.0)
Recognised in OCI | 1.2 | 8.4
Translation adjustment | 24.6 | (10.7)
Balance at end of the year | 259.9 | 168.1
Mining Assets [member] |  |
Liabilities |  |
Liabilities | 893.2 | 908.3
Right-of-use assets [member] |  |
Liabilities |  |
Liabilities | 134.0 | 101.5
Environmental Trust Funds [member] |  |
Liabilities |  |
Liabilities | 4.0 | 3.7
Inventories [member] |  |
Liabilities |  |
Liabilities | 16.4 | 13.3
Unremitted earnings [member] |  |
Liabilities |  |
Liabilities | 12.6 | 13.3
Other [member] |  |
Liabilities |  |
Liabilities | 9.0 | 13.0
Provisions [member] |  |
Assets |  |
Assets | (131.9) | (117.4)
Tax Losses [member] |  |
Assets |  |
Assets | (61.8) | (120.6)
Unredeemed Capital Expenditure [member] |  |
Assets |  |
Assets | (477.3) | (505.7)
Lease liability [member] |  |
Assets |  |
Assets | $ (130.9) | $ (103.0)

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_o&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_56&doctype=Standard -URIDate 2020-01-01 + Details
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