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v3.8.0.1

Credit Facilities, Long-Term Debt, and Finance Lease Obligations - Non-Recourse Debt (Details) - CAD CAD in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2017
Disclosure of detailed information about borrowings [line items] |  |
Borrowings, adjustment to interest rate basis | 3.95% |
Interest rate | 6.65% | 6.65%
Notional amount | CAD 4,311.0 | CAD 3,664.0
Borrowings | CAD 4,361.0 | CAD 3,707.0
5.69% Non-Recourse Debenture due 2016 | Non-recourse debt |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.69% |
Notional amount | CAD 27.0 |
Non-Recourse Bonds | Non-recourse debt |  |
Disclosure of detailed information about borrowings [line items] |  |
Redemption of noncurrent borrowings | 10.0 |
Loss on early redemption of bonds | CAD 1.0 |
Non-Recourse Variable Rate Debt | Minimum |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 2.95% |
Non-Recourse Variable Rate Debt | Maximum |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 5.36% |
New Richmond | 3.963% Non-Recourse Bond due 2032 | Non-recourse debt |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate | 3.963% |
Notional amount | CAD 159.0 |
Principal payment | 4.0 |
Melancthon-Wolfe Wind | 3.834% Non-Recourse Bond due 2028 | Non-recourse debt |  |
Disclosure of detailed information about borrowings [line items] |  |
Principal payment | 35.0 |
TAPC Holdings | Variable Rate Bond due 2030 | Non-recourse debt |  |
Disclosure of detailed information about borrowings [line items] |  |
Notional amount | CAD 202.5 |
TAPC Holdings | Variable Rate Bond due 2030 | Non-recourse debt | Canadian Dollar Offered Rate |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings, adjustment to interest rate basis | 3.95% |

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