XML 190 R162.htm IDEA: XBRL DOCUMENT v3.8.0.1

Share-Based Payment Plans (Details) shares in Millions	1 Months Ended		12 Months Ended
	Mar. 31, 2017 CAD shares	Feb. 29, 2016 CAD shares	Dec. 31, 2017 CAD measurement	Dec. 31, 2016 CAD	Dec. 31, 2015 CAD
Executive officers
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of share options granted (in shares) | shares		1.1
Exercise price of share options granted (in dollars per share)		CAD 5.93
PSUs and RSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Performance period			3 years
Vesting period			3 years
Compensation expense (reversal)			CAD 15,000,000	CAD 17,000,000	CAD (3,000,000)
PSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Performance period			3 years
Number of performance measures | measurement			3
RSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period			3 years
DSUs
Disclosure of terms and conditions of share-based payment arrangement [line items]
Compensation expense (reversal)			CAD 1,000,000	CAD 3,000,000	CAD (2,000,000)
Stock Options
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares authorized (in shares) | shares		13.0
Stock Options | Executive officers
Disclosure of terms and conditions of share-based payment arrangement [line items]
Vesting period	3 years			3 years
Compensation expense (reversal)	CAD 1,000,000	CAD 1,000,000
Number of share options granted (in shares) | shares	0.7
Exercise price of share options granted (in dollars per share)	CAD 7.25
Expiration period of shares granted	7 years	7 years
Employee Share Purchase Plan | Non-executive employees
Disclosure of terms and conditions of share-based payment arrangement [line items]
Maximum amount of interest fee loan as percent of employee salary (as percent)			30.00%
Repayment period			3 years
Amount receivable from employees			CAD 1,000,000	CAD 1,000,000

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

X

- Definition

The amount of expense from share-based payment transactions with employees.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The number of share options granted in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 45
-Subparagraph b
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_ii&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of shares reserved for issue under options and contracts for the sale of shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 79
-Subparagraph a
-Clause vii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_vii&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_SharesReservedForIssueUnderOptionsAndContractsForSaleOfShares
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount of receivables due from related parties. [Refer: Related parties [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 78
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_b&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_TradeAndOtherReceivablesDueFromRelatedParties
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The weighted average exercise price of share options granted in a share-based payment arrangement. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2017-01-01
-Paragraph 45
-Subparagraph b
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_ii&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Award Requisite Service Period2

+ References

No definition available.

+ Details

Name:	tac_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod2
Namespace Prefix:	tac_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Period2

+ References

No definition available.

+ Details

Name:	tac_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod2
Namespace Prefix:	tac_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Number of Performance Measures

+ References

No definition available.

+ Details

Name:	tac_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberofPerformanceMeasures
Namespace Prefix:	tac_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share-based Compensation Arrangement By Share-based Payment Award, Expiration Period1

+ References

No definition available.

+ Details

Name:	tac_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod1
Namespace Prefix:	tac_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Interest Fee Loan, Term

+ References

No definition available.

+ Details

Name:	tac_SharebasedCompensationArrangementbySharebasedPaymentAwardInterestFeeLoanTerm
Namespace Prefix:	tac_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Interest Free Loan, Maximum Amount as Percentage of Employee Salary

+ References

No definition available.

+ Details

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

X

- Details

Name:	tac_TitleofIndividuals1Axis=tac_ExecutiveOfficer1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=tac_PerformanceShareUnitPSUandRestrictedShareUnitRSUPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=tac_PerformanceShareUnitPSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=tac_RestrictedShareUnitRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=tac_DeferredShareUnitDSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=tac_StockOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=tac_EmployeeSharePurchasePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	tac_TitleofIndividuals1Axis=tac_Employee1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: