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CONTINGENCIES AND COMMITMENTS (Details) - CAD ($)
$ in Millions
Mar. 31, 2022
Mar. 31, 2021
Disclosure of Maturity Analysis of Operating and Finance Lease Payments    
Contractual capital commitments $ 504.5 $ 288.7
Less than 1 year    
Disclosure of Maturity Analysis of Operating and Finance Lease Payments    
Contractual capital commitments 290.9 195.9
Between 1 and 5 years    
Disclosure of Maturity Analysis of Operating and Finance Lease Payments    
Contractual capital commitments 210.0 92.8
Later than 5 years    
Disclosure of Maturity Analysis of Operating and Finance Lease Payments    
Contractual capital commitments $ 3.6 $ 0.0