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Income Taxes (Schedule of Change in Deferred Income Tax Liabilities) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Balance, beginning of year | $ 477.0 | $ 291.0
Deferred income tax liability recognized on Richmont Mines acquisition (note 5) | 0.0 | 201.5
Deferred income tax expense (recovery) recognized in net (loss) earnings | 16.9 | (16.3)
Deferred income tax (recovery) expense recognized in OCI | (2.4) | 3.5
Deferred income tax recovery recognized in equity | 0.0 | (2.7)
Balance, end of year | $ 491.5 | $ 477.0

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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2018-03-16 + Details
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