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Other Income (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Analysis of income and expense [abstract]    
Realized gain on equity securities $ (0.6) $ (15.6)
Unrealized (gain) loss on equity securities (10.5) 18.0
Gain on disposition of intangible asset 0.0 (5.6)
Foreign exchange loss 7.2 3.4
Net impairment (reversal) of lease assets and property and equipment 0.3  
Net impairment (reversal) of lease assets and property and equipment   (5.5)
Other (1.3) (1.7)
Total other income $ (4.9) $ (7.0)