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Employee Defined Benefit Plans - Schedule of Employee Defined Benefit Plans (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of defined benefit plans [line items]      
Net employee defined benefit asset $ 72.3 $ 57.4  
Net defined benefit liability (29.5) (32.3)  
Pension defined benefit plans      
Disclosure of defined benefit plans [line items]      
Net employee defined benefit asset 72.3 57.4  
Net defined benefit liability (15.6) (17.0)  
Net defined benefit (asset) liability (56.7) (40.4) $ 25.8
Post employment benefit plans      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability $ (13.9) $ (15.3)