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Related party transactions (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Related party transactions    
Administrative, legal and technical expenses $ 1.1 $ 2.6
Due from Associates 0.1 0.2
Due to Associates 0.1 0.4
Donation made $ 0.0 $ 0.5
Ownership interest held by former parent company 39.70% 44.10%