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Employee Defined Benefit Obligations - Summary of Employee Defined Benefit Obligations (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]      
Net defined benefit pension asset $ (17.0) $ (47.3)  
Net defined benefit liability 58.7 91.2  
Pension defined benefit plans      
Disclosure of defined benefit plans [line items]      
Net defined benefit pension asset (17.0) (47.3)  
Net defined benefit liability 42.8 73.7  
Net defined benefit liability (asset) 25.8 26.4 $ 43.8
Post employment benefit plans      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability $ 15.9 $ 17.5