XML 102 R162.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Preferred Shares - Preferred Share Series Information (Details) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Aug. 30, 2019 | Sep. 17, 2017 | Jun. 16, 2017
Series E |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Convertible preferred shares tendered for conversion |  |  | 133,969 |
Annualized fixed dividend rate | 5.194% |  |  |
Bond yield | 1.544% |  |  |
Dividend rate on preference shares, term | 3.65% |  |  |
Preferred Shares |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Fixed rate reset term | 5 years |  |  |
Amount per share redeemable at reset date | $ 25.00 |  |  |
Series C |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Convertible preferred shares tendered for conversion |  |  |  | 827,628
Annualized fixed dividend rate | 4.027% |  |  |
Bond yield | 0.927% |  |  |
Dividend rate on preference shares, term | 3.10% |  |  |
Series G |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Convertible preferred shares tendered for conversion |  | 140,730 |  |
Annualized fixed dividend rate | 4.988% |  |  |
Bond yield | 1.188% |  |  |
Dividend rate on preference shares, term | 3.80% |  |  |

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 Amount Per Share Redeemable At Reset Date + References No definition available. + Details
Name: | tac_AmountPerShareRedeemableAtResetDate
Namespace Prefix: | tac_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Bond Yield + References No definition available. + Details
Name: | tac_BondYield
Namespace Prefix: | tac_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Convertible Preferred Shares Tendered For Conversion + References No definition available. + Details
Name: | tac_ConvertiblePreferredSharesTenderedForConversion
Namespace Prefix: | tac_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Dividend Rate On Preference Shares + References No definition available. + Details
Name: | tac_DividendRateOnPreferenceShares
Namespace Prefix: | tac_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Dividend Rate On Preference Shares, Spread + References No definition available. + Details
Name: | tac_DividendRateOnPreferenceSharesSpread
Namespace Prefix: | tac_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Preference Shares Fixed Rate Reset Term + References No definition available. + Details
Name: | tac_PreferenceSharesFixedRateResetTerm
Namespace Prefix: | tac_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=tac_PreferenceSharesSeriesEMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_PreferenceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=tac_PreferenceSharesSeriesCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=tac_PreferenceSharesSeriesGMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |