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INCOME TAX EXPENSE - Movements of deferred tax (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of changes in deferred tax liability (asset) |  |
Balance at the beginning of the period | $ 269.3 | $ 220.2
Recognized in the statement of operations | 217.9 | 41.1
Recognized in OCI | (2.1) | 8.0
Balance at the end of the period | 485.1 | 269.3
Unrecognized deferred tax assets and liabilities |  |
Aggregated temporary differences associated with investments in subsidiaries | 8,900.0 | 7,300.0
Deductible temporary differences | 535.2 | 656.5
Tax losses | 394.1 | $ 441.3
Canada | 2027 - 2040 |  |
Non-capital losses that can be applied against future taxable profit |  |
Unused tax losses | 1,011.9 |
United States | 2021 - 2033 |  |
Non-capital losses that can be applied against future taxable profit |  |
Unused tax losses | 33.6 |
Chile | No expiry |  |
Non-capital losses that can be applied against future taxable profit |  |
Unused tax losses | 243.8 |
Brazil | No expiry |  |
Non-capital losses that can be applied against future taxable profit |  |
Unused tax losses | 2.1 |
Russia | No expiry |  |
Non-capital losses that can be applied against future taxable profit |  |
Unused tax losses | 2.5 |
Mauritania | 2021 - 2025 |  |
Non-capital losses that can be applied against future taxable profit |  |
Unused tax losses | 88.6 |
Barbados | 2020 - 2026 |  |
Non-capital losses that can be applied against future taxable profit |  |
Unused tax losses | 144.9 |
Luxembourg | Various |  |
Non-capital losses that can be applied against future taxable profit |  |
Unused tax losses | 75.1 |
Other | Various |  |
Non-capital losses that can be applied against future taxable profit |  |
Unused tax losses | $ 57.5 |

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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The aggregate amount of temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements, for which deferred tax liabilities have not been recognised as a result of satisfying both of the following conditions: (a) the parent, investor, joint venturer or joint operator is able to control the timing of the reversal of the temporary difference; and (b) it is probable that the temporary difference will not reverse in the foreseeable future. [Refer: Associates [member]; Subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_f&doctype=Standard -URIDate 2020-01-01 + Details
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