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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, 2022 | Dec. 31, 2021
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  | $ 2,908,037,000 |
Changes from financing cash flows: |  |  |
Dividends paid |  | (51,895,000) | $ (31,839,000)
Interest paid |  | (38,856,000) | (38,977,000)
Lease principal payments |  | (2,908,000) | (2,727,000)
Shares issued, stock option plan |  | 9,632,000 | 26,771,000
Issuance of shares [note 17] | $ 953,285,000 | 953,285,000 | 0
Total cash changes |  | 869,258,000 | (46,772,000)
Non-cash changes: |  |  |
Amortization of issue costs |  | 750,000 |
Dividends declared |  | 51,895,000 |
Interest expense |  | 39,309,000 |
Right-of-use asset additions |  | 7,853,000 |
Other |  | (523,000) |
Shares issued, stock option plan |  | 2,469,000 |
Issuance of shares, deferred tax [note 17] |  | 11,593,000 |
Foreign exchange |  | (7,000) |
Total non-cash changes |  | 113,339,000 |
Ending balance |  | 3,890,634,000 | 2,908,037,000
Long-Term Borrowings [Member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  | 996,250,000 |
Changes from financing cash flows: |  |  |
Dividends paid |  | 0 |
Interest paid |  | 0 |
Lease principal payments |  | 0 |
Shares issued, stock option plan |  | 0 |
Issuance of shares [note 17] |  | 0 |
Total cash changes |  | 0 |
Non-cash changes: |  |  |
Amortization of issue costs |  | 750,000 |
Dividends declared |  | 0 |
Interest expense |  | 0 |
Right-of-use asset additions |  | 0 |
Other |  | 0 |
Shares issued, stock option plan |  | 0 |
Issuance of shares, deferred tax [note 17] |  | 0 |
Foreign exchange |  | 0 |
Total non-cash changes |  | 750,000 |
Ending balance |  | 997,000,000 | 996,250,000
Interest Payable [Member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  | 3,558,000 |
Changes from financing cash flows: |  |  |
Dividends paid |  | 0 |
Interest paid |  | (38,531,000) |
Lease principal payments |  | 0 |
Shares issued, stock option plan |  | 0 |
Issuance of shares [note 17] |  | 0 |
Total cash changes |  | (38,531,000) |
Non-cash changes: |  |  |
Amortization of issue costs |  | 0 |
Dividends declared |  | 0 |
Interest expense |  | 38,984,000 |
Right-of-use asset additions |  | 0 |
Other |  | 0 |
Shares issued, stock option plan |  | 0 |
Issuance of shares, deferred tax [note 17] |  | 0 |
Foreign exchange |  | 0 |
Total non-cash changes |  | 38,984,000 |
Ending balance |  | 4,011,000 | 3,558,000
Lease Obligation [Member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  | 4,872,000 |
Changes from financing cash flows: |  |  |
Dividends paid |  | 0 |
Interest paid |  | (325,000) |
Lease principal payments |  | (2,908,000) |
Shares issued, stock option plan |  | 0 |
Issuance of shares [note 17] |  | 0 |
Total cash changes |  | (3,233,000) |
Non-cash changes: |  |  |
Amortization of issue costs |  | 0 |
Dividends declared |  | 0 |
Interest expense |  | 325,000 |
Right-of-use asset additions |  | 7,853,000 |
Other |  | (523,000) |
Shares issued, stock option plan |  | 0 |
Issuance of shares, deferred tax [note 17] |  | 0 |
Foreign exchange |  | (7,000) |
Total non-cash changes |  | 7,648,000 |
Ending balance |  | 9,287,000 | 4,872,000
Dividends Payable [Member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  | 0 |
Changes from financing cash flows: |  |  |
Dividends paid |  | (51,895,000) |
Interest paid |  | 0 |
Lease principal payments |  | 0 |
Shares issued, stock option plan |  | 0 |
Issuance of shares [note 17] |  | 0 |
Total cash changes |  | (51,895,000) |
Non-cash changes: |  |  |
Amortization of issue costs |  | 0 |
Dividends declared |  | 51,895,000 |
Interest expense |  | 0 |
Right-of-use asset additions |  | 0 |
Other |  | 0 |
Shares issued, stock option plan |  | 0 |
Issuance of shares, deferred tax [note 17] |  | 0 |
Foreign exchange |  | 0 |
Total non-cash changes |  | 51,895,000 |
Ending balance |  | 0 | 0
Share Capital [Member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance |  | 1,903,357,000 |
Changes from financing cash flows: |  |  |
Dividends paid |  | 0 |
Interest paid |  | 0 |
Lease principal payments |  | 0 |
Shares issued, stock option plan |  | 9,632,000 |
Issuance of shares [note 17] |  | 953,285,000 |
Total cash changes |  | 962,917,000 |
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 |  | 2,469,000 |
Issuance of shares, deferred tax [note 17] |  | 11,593,000 |
Foreign exchange |  | 0 |
Total non-cash changes |  | 14,062,000 |
Ending balance |  | $ 2,880,336,000 | $ 1,903,357,000

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