XML 181 R153.htm IDEA: XBRL DOCUMENT v3.8.0.1

Common Shares - Premium Dividend, Dividend Reinvestment, and Optimal Common Share Purchase Plan (Details) - shares shares in Millions		12 Months Ended
	Feb. 21, 2012	Dec. 31, 2017	Dec. 31, 2016
Common shares
Disclosure of classes of share capital [line items]
Number of shares issued		0.0	3.9
Dividend Reinvestment Plan
Disclosure of classes of share capital [line items]
Discount on average market price of common shares	3.00%
Premium cash payment	102.00%

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfClassesOfShareCapitalLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The increase (decrease) in the number of shares outstanding. [Refer: Number of shares outstanding]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 79
-Subparagraph a
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iv&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_IncreaseDecreaseInNumberOfSharesOutstanding
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage Discount On Average Market Price Of Common Shares

+ References

No definition available.

+ Details

Name:	tac_PercentageDiscountOnAverageMarketPriceOfCommonShares
Namespace Prefix:	tac_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage Premium Cash Payment On Reinvested Dividends

+ References

No definition available.

+ Details

Name:	tac_PercentagePremiumCashPaymentOnReinvestedDividends
Namespace Prefix:	tac_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ClassesOfShareCapitalAxis=tac_CommonsharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	tac_PlanName1Axis=tac_DividendReinvestmentPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: