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INCOME TAX EXPENSE - Current and deferred tax expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Current tax expense |  |
Current period | $ 297.7 | $ 206.6
Adjustment for prior periods | (75.8) | (1.0)
Deferred tax expense |  |
Origination and reversal of temporary differences | 335.5 | 223.0
Impact of changes in tax rate | (0.8) | (1.6)
Change in unrecognized deductible temporary differences | (73.4) | (156.3)
Recognition of previously unrecognized tax losses | (43.4) | (24.0)
Total tax expense | $ 439.8 | $ 246.7

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- Definition The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 80 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_80_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of deferred tax expense or income relating to the creation or reversal of temporary differences. [Refer: Temporary differences [member]; Deferred tax expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 80 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_80_c&doctype=Standard -URIDate 2020-01-01 + Details
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