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Employee Defined Benefit Obligations - Summary of Major Categories of Plan Assets, Measured at Fair Value (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of fair value of plan assets [Line Items]    
Cash and cash equivalents $ 23.1 $ 9.6
Fair value of plan assets 560.3 575.2
Level 1    
Disclosure of fair value of plan assets [Line Items]    
  Equities 43.1 149.1
  Corporate bonds and fixed income 9.9 130.6
  Pooled fund liability-driven investments 26.2 21.2
  Property funds 1.6 10.1
Level 2 and 3 of fair value hierarchy    
Disclosure of fair value of plan assets [Line Items]    
Cash and cash equivalents 10.3 0.9
  Corporate bonds and fixed income 27.9 41.2
  Annuity policies 317.5 127.0
Equities and property $ 100.7 $ 85.5