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Long-term debt (Tables) | 12 Months Ended
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Dec. 31, 2023
Financial Instruments [Abstract] |
Schedule of long-term debt |
As at | Dec 31 2023 | Dec 31 2022 |
Unsecured notes |  |  |
(i) $300 million at 4.25% due December 1, 2024 | $ | 299,283 |  | $ | 298,836 |  |
(ii) $700 million at 5.125% due October 15, 2027 | 694,844 |  | 693,649 |  |
(iii) $700 million at 5.25% due December 15, 2029 | 695,824 |  | 695,283 |  |
(iv) $300 million at 5.65% due December 1, 2044 | 295,709 |  | 295,606 |  |
| 1,985,660 |  | 1,983,374 |  |
Other limited recourse debt facilities |  |  |
(i) 5.58% due through June 30, 2031 | 56,637 |  | 61,978 |  |
(ii) 5.35% due through September 30, 2033 | 65,300 |  | 70,312 |  |
(iii) 5.21% due through September 15, 2036 | 34,204 |  | 35,849 |  |
| 156,141 |  | 168,139 |  |
Total long-term debt 1 | 2,141,801 |  | 2,151,513 |  |
Less current maturities 1 | (314,716) |  | (15,133) |  |
| $ | 1,827,085 |  | $ | 2,136,380 |  |
1 Long-term debt and current maturities are presented net of discounts and deferred financing fees of $16.8 million as at December 31, 2023 (2022 - $19.4 million).
Schedule of minimum principal payments for long-term debt | The gross minimum principal payments for long-term debt in aggregate and for each of the five succeeding years are as follows:
| Other limited recourse debt facilities |  | Unsecured notes |  | Total
2024 | $ | 15,367 |  | $ | 300,000 |  |  | $ | 315,367
2025 | 13,660 |  | — |  |  | 13,660
2026 | 13,796 |  | — |  |  | 13,796
2027 | 15,173 |  | 700,000 |  |  | 715,173
2028 | 16,026 |  | — |  |  | 16,026
Thereafter | 84,574 |  | 1,000,000 |  |  | 1,084,574
| $ | 158,596 |  | $ | 2,000,000 |  |  | $ | 2,158,596

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