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CONTINGENCIES AND COMMITMENTS (Details) - CAD ($)
$ in Millions
Mar. 31, 2023
Mar. 31, 2022
Disclosure of Maturity Analysis of Operating and Finance Lease Payments    
Contractual capital commitments $ 549.0 $ 504.5
Less than 1 year    
Disclosure of Maturity Analysis of Operating and Finance Lease Payments    
Contractual capital commitments 297.5 290.9
Between 1 and 5 years    
Disclosure of Maturity Analysis of Operating and Finance Lease Payments    
Contractual capital commitments 249.6 210.0
Later than 5 years    
Disclosure of Maturity Analysis of Operating and Finance Lease Payments    
Contractual capital commitments $ 1.9 $ 3.6