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Income Taxes - Reconciliation of Net Deferred Tax Assets (Liabilities) (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of changes in deferred tax liability (asset) [abstract]
Balance, beginning of the year	$ (41.3)	$ (21.6)
Tax effect on equity items	(2.0)	4.0
Impact of foreign exchange	0.9	0.8
Other	0.4	0.2
Deferred taxes acquired through business combinations	0.2	(9.6)
Tax (expense) recovery during the year recognized in net income	20.8	(15.1)
Balance, end of the year	(21.0)	(41.3)
Previously stated
Reconciliation of changes in deferred tax liability (asset) [abstract]
Balance, beginning of the year	(41.3)	(33.1)
Balance, end of the year		(41.3)
Increase (decrease) due to changes in accounting policy required by IFRSs
Reconciliation of changes in deferred tax liability (asset) [abstract]
Balance, beginning of the year	$ 0.0	11.5
Balance, end of the year		$ 0.0

X

- Definition

The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities]

+ References

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-Name IAS
-Number 12
-IssueDate 2020-01-01
-Paragraph 81
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- Definition

The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

+ References

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-Number 12
-IssueDate 2020-01-01
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+ References

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-Name IAS
-Number 12
-IssueDate 2020-01-01
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The increase (decrease) in deferred tax liability (asset) resulting from business combinations. [Refer: Deferred tax liability (asset)]

+ References

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- Definition

The increase (decrease) in deferred tax liability (asset) resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Deferred tax liability (asset)]

+ References

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