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CONTINGENCIES AND COMMITMENTS - Schedule of contractual purchase commitments that are not recognized as liabilities (Details) - CAD ($)
$ in Millions
Mar. 31, 2025
Mar. 31, 2024
Disclosure of Maturity Analysis of Operating and Finance Lease Payments    
Contractual capital commitments $ 697.5 $ 578.0
Less than 1 year    
Disclosure of Maturity Analysis of Operating and Finance Lease Payments    
Contractual capital commitments 411.8 329.3
Between 1 and 5 years    
Disclosure of Maturity Analysis of Operating and Finance Lease Payments    
Contractual capital commitments 262.1 245.5
Later than 5 years    
Disclosure of Maturity Analysis of Operating and Finance Lease Payments    
Contractual capital commitments $ 23.6 $ 3.2