XML 180 R152.htm IDEA: XBRL DOCUMENT v3.8.0.1

Common Shares - Shareholder Rights Plan (Details) - Shareholder Rights Plan - Common shares	12 Months Ended
	Dec. 31, 2017 CAD
Disclosure of classes of share capital [line items]
Value of common shares received under Shareholder Rights Plan	CAD 200
Purchase price of common shares under Shareholder Rights Plan	CAD 100
Minimum
Disclosure of classes of share capital [line items]
Percentage of outstanding common shares at which Shareholder Rights Plan may take effect	20.00%

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

Purchase Price Of Common Shares Under Shareholder Rights Plan

+ References

No definition available.

+ Details

Name:	tac_PurchasePriceOfCommonSharesUnderShareholderRights
Namespace Prefix:	tac_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Shareholder Rights Plan, Percentage Of Outstanding Common Shares Potentially Purchased At Which Shareholder Rights Are Exercisable

+ References

No definition available.

+ Details

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

X

- Definition

Value Of Common Shares Received Under Shareholder Rights Plan

+ References

No definition available.

+ Details

Name:	tac_ValueOfCommonSharesReceivedUnderShareholderRights
Namespace Prefix:	tac_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

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

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: