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Employee Defined Benefit Plans - Schedule of Employee Defined Benefit Plans (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Jan. 01, 2023
Disclosure of defined benefit plans [line items]      
Net employee defined benefit asset $ 75.0 $ 72.3 $ 57.4
Net employee defined benefit liability (22.4) (29.5) $ (32.3)
Pension defined benefit plans      
Disclosure of defined benefit plans [line items]      
Net employee defined benefit asset 75.0 72.3  
Net employee defined benefit liability (6.4) (15.6)  
Post employment benefit plans      
Disclosure of defined benefit plans [line items]      
Net employee defined benefit liability $ (16.0) $ (13.9)