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v3.24.4

Long-term debt - Long-term debt (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 CAD ($) tranche | Sep. 30, 2024 USD ($) tranche | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2024 CAD ($) tranche | Sep. 30, 2023 CAD ($) | Sep. 30, 2024 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings | $ 2,688,308,000 |  |  |  | $ 2,688,308,000 | $ 3,100,321,000 |
Current portion | 999,000 |  |  |  | 999,000 | 1,158,971,000 |
Long-term debt | 2,687,309,000 |  |  |  | 2,687,309,000 | 1,941,350,000 |
Repayments of borrowings |  |  |  |  | 1,154,878,000 | 79,150,000 |
Settled cross-currency swap agreement |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Notional amount of financial liabilities | 954,832,000 |  |  |  | 954,832,000 |  |
2014 U.S. Senior Notes |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings | $ 0 |  |  |  | 0 | 473,808,000 |
Number of notes | tranche | 2 | 2 |  |  |  |  |
2021 U.S. Senior Notes |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings | $ 1,342,758,000 |  |  |  | $ 1,342,758,000 | 1,342,714,000 |
Number of notes | tranche |  |  |  |  | 2 |  |
2021 U.S. Senior Notes | Gross carrying amount |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Notional amount of financial liabilities | 1,000,000,000 |  |  |  | $ 1,000,000,000 |  |
Borrowings less financing fees | $ 1,351,500,000 |  |  |  | $ 1,351,500,000 |  |
2021 U.S. Senior Notes | Weighted average |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings, maturity term |  |  |  |  | 4 years |  |
Borrowings, interest rate | 1.79% |  |  |  | 1.79% |  | 1.79%
2021 U.S. Senior Notes | Later than one year and not later than two years |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Notional amount of financial liabilities | $ 810,900,000 |  |  |  | $ 810,900,000 |  | $ 600,000,000
2021 U.S. Senior Notes | Beyond five years |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Notional amount of financial liabilities | 540,600,000 |  |  |  | 540,600,000 |  | $ 400,000,000
2021 CAD Senior Notes |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings | $ 597,212,000 |  |  |  | $ 597,212,000 | 596,550,000 |
Borrowings, interest rate | 2.10% |  |  |  | 2.10% |  | 2.10%
2021 CAD Senior Notes | Gross carrying amount |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Notional amount of financial liabilities | $ 600,000,000 |  |  |  | $ 600,000,000 |  |
Borrowings less financing fees | 600,000,000 |  |  |  | 600,000,000 |  |
2021 CAD Senior Notes | Later than three years and not later than four years |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Notional amount of financial liabilities | 600,000,000 |  |  |  | 600,000,000 |  |
2024 CAD Senior Notes |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings | $ 746,144,000 |  |  |  | 746,144,000 | 0 |
Number of notes | tranche | 2 | 2 |  |  |  |  |
2024 CAD Senior Notes | Gross carrying amount |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Notional amount of financial liabilities | $ 750,000,000 |  |  |  | $ 750,000,000 |  |
2024 CAD Senior Notes | Weighted average |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings, maturity term | 4 years | 4 years |  |  |  |  |
Borrowings, interest rate | 4.08% |  |  |  | 4.08% |  | 4.08%
2024 CAD Senior Notes | Later than two years and not later than three years |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Notional amount of financial liabilities | $ 300,000,000 |  |  |  | $ 300,000,000 |  |
2024 CAD Senior Notes | Later than four years and not later than five years |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Notional amount of financial liabilities | 450,000,000 |  |  |  | 450,000,000 |  |
Unsecured committed term loan credit facility |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings | 0 |  |  |  | 0 | 676,886,000 |
Repayments of borrowings |  |  |  | $ 500,000,000 |  |  |
Unsecured committed term loan credit facility | Settled cross-currency swap agreement |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Repayments of borrowings |  |  | $ 670,350,000 |  |  |  |
Other long-term debt |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings | 2,194,000 |  |  |  | 2,194,000 | $ 10,363,000 |
Remaining total tranches | 2014 U.S. Senior Notes |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Repayments of borrowings |  | $ 350,000,000 |  |  |  |  |
Remaining total tranches | 2014 U.S. Senior Notes | Settled cross-currency swap agreement |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Repayments of borrowings | 475,825,000 |  |  |  |  |  |
Remaining total tranches | 2014 U.S. Senior Notes | Less than one year |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Notional amount of financial liabilities | $ 473,025,000 |  |  |  | $ 473,025,000 |  | $ 350,000,000

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