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Employee Defined Benefit Obligations - Additional Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Employee Benefits [Abstract]    
Amount expected to be contribute in next annual reporting period $ 21.0  
Percent of defined benefit obligation was fully covered against changes in interest rates 56.90% 54.20%
Remeasurement (loss) gain on net employee defined benefit liability $ 35.5 $ (10.1)
Deferred tax expense on remeasurement of net employee defined benefit liability $ 14.2 $ 4.7
Percentage of plans' assets invested in mutual funds and exchange-traded funds or held in cash 14.00%  
Percentage of plans' assets held in annuity policies 52.00%  
Weighted average duration of defined benefit obligation 15 years 15 years
Rate of inflation, pre-retirement 2.68% 2.74%
Remeasurement gain (loss) on net employee defined benefit obligations $ 35.5 $ (10.1)