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Common Shares - Dividends (Details)	Dec. 12, 2022 $ / shares
Share Capital, Reserves And Other Equity Interest [Abstract]
Dividends declared per share (in CAD per share)	$ 0.055

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- Definition

The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 137
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_137_a&doctype=Standard
-URIDate 2022-03-24

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share Capital, Reserves And Other Equity Interest [Abstract]

+ References

No definition available.

+ Details

Name:	tac_ShareCapitalReservesAndOtherEquityInterestAbstract
Namespace Prefix:	tac_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration