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Employee Defined Benefit Plans - Additional Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Employee Benefits [Abstract]    
Amount expected to be contribute in next annual reporting period $ 7.0  
Percent of defined benefit obligation was fully covered against changes in interest rates 55.20% 56.90%
Deferred tax (recovery) expense on remeasurement of net employee defined benefit liability $ (4.7) $ 14.2
Remeasurement gain on net employee defined benefit plans $ 7.8 $ 35.5
Percentage of plans' assets invested in mutual funds and exchange-traded funds or held in cash 52.00%  
Percentage of plans' assets held in annuity policies 48.00%  
Weighted average duration of defined benefit obligation 14 years 15 years