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Related party transactions (Narrative) (Details)
$ in Millions, $ in Millions
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Associates [Member]        
Disclosure of transactions between related parties [line items]        
Notes receivable $ 8.2 $ 6.2   $ 30.9
Insurance Company [Member] | Environmental Bond [Member]        
Disclosure of transactions between related parties [line items]        
Bonds issued     $ 17.9