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Income Taxes - Major Components Of Tax Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Current income tax expense: |  |  |
Current year | $ 38.9 | $ 35.1 | $ 44.4
Adjustments for prior years, including changes to net provisions related to tax uncertainties | (6.0) | (12.3) | (4.7)
Current tax expense | 32.9 | 22.8 | 39.7
Deferred income tax expense (recovery): |  |  |
Origination and reversal of temporary differences | 10.1 | 15.4 | 6.2
Changes in previously unrecognized tax losses and deductible temporary differences, including adjustments for prior years | (13.4) | (8.7) | (62.9)
Deferred tax expense | (3.3) | 6.7 | (56.7)
Income tax expense (recovery) | $ 29.6 | $ 29.5 | $ (17.0)

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- Definition Adjustments of tax expense (income) recognised in the period for the deferred tax of prior periods. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 80 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_80&doctype=Standard -URIDate 2020-01-01 + Details
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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 tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; 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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