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FINANCIAL RISK MANAGEMENT - Forward Foreign Currency Contracts (Details) - Currency risk
$ in Millions
 12 Months Ended
Mar. 31, 2020
CAD ($)
Mar. 31, 2019
CAD ($)
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 1,862.5 $ 1,708.0
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 $ 833.7 $ 717.4
Average foreign exchange rate 0.74 0.77
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 $ 176.4 $ 167.3
Average foreign exchange rate 0.76 0.77
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 $ 13.0 $ 17.4
Average foreign exchange rate 0.77 0.79
USD/CDN | More than 5 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 0.0 $ 1.3
Average foreign exchange rate 0.00 0.00
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 $ 180.5 $ 166.2
Average foreign exchange rate 0.64 0.65
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 $ 12.3 $ 71.3
Average foreign exchange rate 0.60 0.61
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 $ 71.5 $ 49.8
Average foreign exchange rate 0.59 0.58
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 $ 0.2 $ 1.8
Average foreign exchange rate 0.60 0.55
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 $ 289.7 $ 282.9
Average foreign exchange rate 1.36 1.33
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 $ 23.7 $ 0.0
Average foreign exchange rate 1.32 0.00
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 $ 247.5 $ 231.6
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 0.8 1.0
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 $ 13.2 $ 0.0