v3.26.1
RELATED PARTY TRANSACTIONS - Accounts receivable from affiliated corporations (Details) - CAD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
RELATED PARTY TRANSACTIONS    
Total receivables $ 29.1 $ 33.5
Ultimate parent and parent corporation    
RELATED PARTY TRANSACTIONS    
Accounts receivable 2.2 2.4
Dividends receivable   4.7
Interest receivable 14.9 14.6
Corporations under common control    
RELATED PARTY TRANSACTIONS    
Accounts receivable $ 12.0 $ 11.8