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Income Taxes - Schedule of Reconciliation of Net Deferred Tax Assets (Liabilities) (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Balance, beginning of the year $ 66.2 $ 10.2
Tax recovery during the year recognized in net income 42.4 50.4
Impact of foreign exchange 3.5 (4.4)
Tax effect on equity items 0.6 8.3
Deferred taxes acquired through business combinations (57.0) 1.7
Balance, end of the year $ 55.7 $ 66.2