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Income Taxes - Summary of Loss Carryforwards and Deductible Temporary Differences (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deductible temporary differences | $ 1.1 | $ 9.2
Non-capital tax losses |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Non-capital and capital tax losses | 70.5 | 109.0
Non-capital tax losses | Expire (2021 to 2040) |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Non-capital and capital tax losses | 37.0 | 37.8
Non-capital tax losses | Never expire |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Non-capital and capital tax losses | 33.5 | 71.2
Capital tax losses | Never expire |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Non-capital and capital tax losses | 2.6 | 6.8
Non-capital and capital tax losses |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Non-capital and capital tax losses | $ 74.2 | $ 125.0

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- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: 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 e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_e&doctype=Standard -URIDate 2020-01-01 + Details
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