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Employee Defined Benefit Obligations - Summary of Employee Defined Benefit Obligations (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of defined benefit plans [line items]      
Net defined benefit pension asset $ (47.3) $ (26.0)  
Net defined benefit liability 91.2 85.2  
Pension defined benefit plans      
Disclosure of defined benefit plans [line items]      
Net defined benefit pension asset (47.3) (26.0)  
Net defined benefit liability 73.7 69.8  
Net defined benefit liability (asset) 26.4 43.8 $ 45.5
Post employment benefit plans      
Disclosure of defined benefit plans [line items]      
Net defined benefit liability $ 17.5 $ 15.4