XML 121 R102.htm IDEA: XBRL DOCUMENT v3.22.0.1
Employee Defined Benefit Obligations - Additional Information (Details) - CAD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Employee Benefits [Abstract]      
Amount expected to be contribute in next annual reporting period   $ 15.0  
Percent of defined benefit obligation was fully covered against changes in interest rates 54.20% 54.20% 21.10%
Remeasurement (loss) gain on net employee defined benefit liability   $ (10.1) $ (0.4)
Deferred tax expense (recovery) on remeasurement of net employee defined benefit liability   $ (4.7) $ (0.1)
Percentage of plans' assets invested in mutual funds and exchange-traded funds or held in cash   19.00%  
Percentage of plans' assets held in annuity policies   57.00%  
Weighted average duration of defined benefit obligation   15 years 15 years
Rate of inflation, pre-retirement 2.74% 2.74% 2.40%
Remeasurement loss on net employee defined benefit liability   $ (10.1) $ (0.4)
Remeasurement adjustment, representing the difference between the premium paid for the annuity policy and the value of the related defined benefit obligation $ 39.4