XML 183 R155.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Common Shares - Dividends (Details) - CAD / shares | Oct. 17, 2016 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Share Capital, Reserves And Other Equity Interest [Abstract] |  |  |
Annual dividend per share |  | CAD 0.16 | CAD 0.72
Dividends declared per share | CAD 0.04 |  |

X
- 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 2017-01-01 -Paragraph 137 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_137_a&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare
Namespace Prefix: | ifrs-full_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Annual Dividend Per Share + References No definition available. + Details
Name: | tac_AnnualDividendPerShare
Namespace Prefix: | tac_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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