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Supplemental cash flow information (Reconciliation of liabilities arising from financing activities) (Details) - CAD ($) |  | 12 Months Ended
--- | --- | ---
Oct. 17, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  | $ 3,890,634,000 |
Changes from financing cash flows: |  |  |
Dividends paid |  | (52,079,000) | $ (51,895,000)
Interest paid |  | (40,798,000) | (38,856,000)
Lease principal payments |  | (2,430,000) | (2,908,000)
Shares issued, stock option plan |  | 27,537,000 | 9,632,000
Issuance of shares [note 17] | $ 953,285,000 | 0 | 953,285,000
Proceeds of long-term debt |  | 816,582,000 | 0
Total cash changes |  | 748,812,000 | 869,258,000
Non-cash changes: |  |  |
Amortization of issue costs |  | 1,377,000 |
Dividends declared |  | 52,079,000 |
Interest expense |  | 51,049,000 |
Right-of-use asset additions |  | 4,368,000 |
Other |  | (269,000) |
Shares issued, stock option plan |  | 6,292,000 |
Foreign exchange |  | (31,100,000) |
Total non-cash changes |  | 83,796,000 |
Ending balance |  | 4,723,242,000 | 3,890,634,000
Long-Term Borrowings [Member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  | 997,000,000 |
Changes from financing cash flows: |  |  |
Dividends paid |  | 0 |
Interest paid |  | 0 |
Lease principal payments |  | 0 |
Shares issued, stock option plan |  | 0 |
Proceeds of long-term debt |  | 816,582,000 |
Total cash changes |  | 816,582,000 |
Non-cash changes: |  |  |
Amortization of issue costs |  | 1,377,000 |
Dividends declared |  | 0 |
Interest expense |  | 0 |
Right-of-use asset additions |  | 0 |
Other |  | 0 |
Shares issued, stock option plan |  | 0 |
Foreign exchange |  | (30,785,000) |
Total non-cash changes |  | (29,408,000) |
Ending balance |  | 1,784,174,000 | 997,000,000
Interest Payable [Member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  | 4,011,000 |
Changes from financing cash flows: |  |  |
Dividends paid |  | 0 |
Interest paid |  | (40,439,000) |
Lease principal payments |  | 0 |
Shares issued, stock option plan |  | 0 |
Proceeds of long-term debt |  | 0 |
Total cash changes |  | (40,439,000) |
Non-cash changes: |  |  |
Amortization of issue costs |  | 0 |
Dividends declared |  | 0 |
Interest expense |  | 50,690,000 |
Right-of-use asset additions |  | 0 |
Other |  | 142,000 |
Shares issued, stock option plan |  | 0 |
Foreign exchange |  | (317,000) |
Total non-cash changes |  | 50,515,000 |
Ending balance |  | 14,087,000 | 4,011,000
Lease Obligation [Member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  | 9,287,000 |
Changes from financing cash flows: |  |  |
Dividends paid |  | 0 |
Interest paid |  | (359,000) |
Lease principal payments |  | (2,430,000) |
Shares issued, stock option plan |  | 0 |
Proceeds of long-term debt |  | 0 |
Total cash changes |  | (2,789,000) |
Non-cash changes: |  |  |
Amortization of issue costs |  | 0 |
Dividends declared |  | 0 |
Interest expense |  | 359,000 |
Right-of-use asset additions |  | 4,368,000 |
Other |  | (411,000) |
Shares issued, stock option plan |  | 0 |
Foreign exchange |  | 2,000 |
Total non-cash changes |  | 4,318,000 |
Ending balance |  | 10,816,000 | 9,287,000
Dividends Payable [Member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  | 0 |
Changes from financing cash flows: |  |  |
Dividends paid |  | (52,079,000) |
Interest paid |  | 0 |
Lease principal payments |  | 0 |
Shares issued, stock option plan |  | 0 |
Proceeds of long-term debt |  | 0 |
Total cash changes |  | (52,079,000) |
Non-cash changes: |  |  |
Amortization of issue costs |  | 0 |
Dividends declared |  | 52,079,000 |
Interest expense |  | 0 |
Right-of-use asset additions |  | 0 |
Other |  | 0 |
Shares issued, stock option plan |  | 0 |
Foreign exchange |  | 0 |
Total non-cash changes |  | 52,079,000 |
Ending balance |  | 0 | 0
Share Capital [Member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  | 2,880,336,000 |
Changes from financing cash flows: |  |  |
Dividends paid |  | 0 |
Interest paid |  | 0 |
Lease principal payments |  | 0 |
Shares issued, stock option plan |  | 27,537,000 |
Proceeds of long-term debt |  | 0 |
Total cash changes |  | 27,537,000 |
Non-cash changes: |  |  |
Amortization of issue costs |  | 0 |
Dividends declared |  | 0 |
Interest expense |  | 0 |
Right-of-use asset additions |  | 0 |
Other |  | 0 |
Shares issued, stock option plan |  | 6,292,000 |
Foreign exchange |  | 0 |
Total non-cash changes |  | 6,292,000 |
Ending balance |  | $ 2,914,165,000 | $ 2,880,336,000

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