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Employee Defined Benefit Plans - Schedule of Major Categories of Plan Assets, Measured at Fair Value (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value of plan assets [Line Items]    
Cash and cash equivalents $ 26.7 $ 18.9
Fair value of plan assets 459.3 422.9
Level 1    
Disclosure of fair value of plan assets [Line Items]    
  Equities 18.7 15.2
  Fixed income, corporate bonds, and gilts 71.0 6.5
  Pooled fund liability-driven investments 118.2 18.7
  Alternatives and property funds 2.5 0.6
Level 2 and 3 of fair value hierarchy    
Disclosure of fair value of plan assets [Line Items]    
Cash and cash equivalents 0.0 21.0
  Fixed income, corporate bonds, and gilts 0.0 26.8
  Annuity policies 222.2 217.7
Equities and property $ 0.0 $ 97.5