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Employee Defined Benefit Obligations - Summary of Employee Defined Benefit Obligations (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]      
Net defined benefit pension asset $ (57.4) $ (17.0)  
Net defined benefit liability 32.3 58.7  
Pension defined benefit plans      
Disclosure of defined benefit plans [line items]      
Net defined benefit pension asset (57.4) (17.0)  
Net defined benefit liability 17.0 42.8  
Net defined benefit liability (asset) (40.4) 25.8 $ 26.4
Post employment benefit plans      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability $ 15.3 $ 15.9