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Income Taxes (Movement in net deferred tax assets and liabilities) (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Net deferred tax asset, beginning of year $ 937,579,000 $ 936,678,000
Recovery for the year in net earnings 12,142,000 5,448,000
Recovery for the year in equity 11,593,000 0
Recovery for the year in purchase price equation 28,196,000 0
Expense for the year in other comprehensive income (5,440,000) (4,541,000)
Effect of movements in exchange rates 1,000 (6,000)
Net deferred tax asset, end of year $ 984,071,000 $ 937,579,000