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Other Assets - Schedule of Other Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of other assets [line items]    
Financial assets $ 204.5 $ 156.8
Other assets 296.3 234.8
Less current portion - financial 15.8 9.1
Less current portion - non-financial 1.3 1.1
Long-term portion 279.2 224.6
Investments held for self-insured liabilities    
Disclosure of other assets [line items]    
Financial assets 204.5 156.8
Holdbacks on long-term contracts    
Disclosure of other assets [line items]    
Financial assets 25.2 33.7
Other    
Disclosure of other assets [line items]    
Financial assets 48.6 27.0
Other $ 18.0 $ 17.3