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Long term debt - Schedules (Details) - CAD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Oct. 21, 2020 | Dec. 31, 2019
Disclosure of detailed information about borrowings [line items] |  |  |
Unsecured debentures | $ 995,541 |  | $ 996,718
Long-term debt | 995,541 |  | 996,718
2021 [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Unsecured debentures | 0 |  |
2022 [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Unsecured debentures | 0 |  |
2023 [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Unsecured debentures | 0 |  |
2024 [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Unsecured debentures | 498,630 |  |
2025 [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Unsecured debentures | 0 |  |
Thereafter [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Unsecured debentures | 496,911 |  |
Series E [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Unsecured debentures | $ 0 |  | 399,152
Stated interest rates on debentures | 3.75% |  |
Maturity date of borrowings | November 14, 2022 |  |
Series F [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Unsecured debentures | $ 99,319 |  | 99,302
Stated interest rates on debentures | 5.09% |  |
Maturity date of borrowings | November 14, 2042 |  |
Series G [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Unsecured debentures | $ 498,630 |  | 498,264
Stated interest rates on debentures | 4.19% |  |
Maturity date of borrowings | June 24, 2024 |  |
Series H [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Unsecured debentures | $ 397,592 |  | $ 0
Stated interest rates on debentures | 2.95% | 2.95% |
Maturity date of borrowings | October 21, 2027 |  |

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