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CONTINGENCIES AND COMMITMENTS (Details) - CAD ($)
$ in Millions
Mar. 31, 2024
Mar. 31, 2023
Disclosure of Maturity Analysis of Operating and Finance Lease Payments    
Contractual capital commitments $ 578.0 $ 549.0
Less than 1 year    
Disclosure of Maturity Analysis of Operating and Finance Lease Payments    
Contractual capital commitments 329.3 297.5
Between 1 and 5 years    
Disclosure of Maturity Analysis of Operating and Finance Lease Payments    
Contractual capital commitments 245.5 249.6
Later than 5 years    
Disclosure of Maturity Analysis of Operating and Finance Lease Payments    
Contractual capital commitments $ 3.2 $ 1.9