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Other Assets - Schedule of Other Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of other assets [line items]    
Financial assets $ 198.3 $ 174.9
Other assets 252.4 233.3
Less current portion - financial 21.4 34.7
Less current portion - non-financial 2.1 7.4
Long-term portion 228.9 191.2
Investments held for self-insured liabilities    
Disclosure of other assets [line items]    
Financial assets 198.3 174.9
Holdbacks on long-term contracts    
Disclosure of other assets [line items]    
Financial assets 23.6 25.9
Other    
Disclosure of other assets [line items]    
Financial assets 15.5 12.4
Other 7.6 11.8
Investments in joint ventures and associates    
Disclosure of other assets [line items]    
Other $ 7.4 $ 8.3