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FINANCIAL RISK MANAGEMENT - Forward Foreign Currency Contracts (Details) - Currency risk
$ in Millions
 12 Months Ended
Mar. 31, 2021
CAD ($)
Mar. 31, 2020
CAD ($)
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 2,449.6 $ 1,862.5
USD/CDN | No later than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 530.9 $ 833.7
Average foreign exchange rate 0.77 0.74
USD/CDN | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 127.4 $ 176.4
Average foreign exchange rate 0.77 0.76
USD/CDN | Between 3 and 5 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 20.5 $ 13.0
Average foreign exchange rate 0.78 0.77
EUR/CDN | No later than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 88.4 $ 180.5
Average foreign exchange rate 1.54 0.64
EUR/CDN | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 95.2 $ 12.3
Average foreign exchange rate 1.57 0.60
GBP/CDN | No later than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 52.7 $ 71.5
Average foreign exchange rate 0.57 0.59
GBP/CDN | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 11.5 $ 0.2
Average foreign exchange rate 0.58 0.60
CDN/USD | No later than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 1,224.7 $ 289.7
Average foreign exchange rate 1.27 1.36
CDN/USD | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 31.0 $ 23.7
Average foreign exchange rate 1.37 1.32
Other Currencies | No later than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 260.8 $ 247.5
Other Currencies | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic 1.5 0.8
Other Currencies | Between 3 and 5 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 5.0 $ 13.2