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Income Taxes - Summary of Major Components of Current Income Tax Expense from Continuing Operations (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Income taxes [Abstract] |  |
Ongoing operations | $ 76.9 | $ 54.9
UK reorganization tax and US transition tax | 2.6 | 1.1
Current income tax expense | $ 79.5 | $ 56.0

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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 Income taxes + References No definition available. + Details
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