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Employee Defined Benefit Obligations - Additional Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Nov. 25, 2020
Dec. 31, 2020
Dec. 31, 2019
Employee benefits [Abstract]      
Amount expected to be contribute in 2021   $ 15.4  
Remeasurement (loss) gain on net employee defined benefit liability $ 2.4 (0.4) $ (16.5)
Deferred tax expense (recovery) on remeasurement of net employee defined benefit liability   $ (0.1) $ (3.6)
Percentage of plans' assets invested in mutual funds and exchange-traded funds or held in cash   56.00%  
Percentage of plans' assets held in annuity policies   22.00%  
Weighted average duration of defined benefit obligation   15 years 16 years
Reduction in CPI 0.10%    
Rate of inflation, pre-retirement   2.40% 2.60%
Remeasurement loss on net employee defined benefit liability $ 2.4 $ (0.4) $ (16.5)