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FINANCIAL RISK MANAGEMENT - Forward Foreign Currency Contracts (Details) - Currency risk
$ in Millions
 12 Months Ended
Mar. 31, 2019
CAD ($)
Mar. 31, 2018
CAD ($)
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 1,708.0 $ 1,351.4
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 $ 717.4 $ 572.2
Average foreign exchange rate 0.77 0.79
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 $ 167.3 $ 131.6
Average foreign exchange rate 0.77 0.78
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 $ 17.4 $ 20.2
Average foreign exchange rate 0.79 0.80
USD/CDN | Later than 5 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 1.3 $ 0.0
Average foreign exchange rate 0.79 0.00
CDN/EUR | No later than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 40.1 $ 40.1
Average foreign exchange rate 1.51 1.57
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 $ 166.2 $ 125.6
Average foreign exchange rate 0.65 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 $ 71.3 $ 2.5
Average foreign exchange rate 0.61 0.63
EUR/CDN | Between 3 and 5 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 0.0 $ 0.2
Average foreign exchange rate 0.00 0.59
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 $ 49.8 $ 72.4
Average foreign exchange rate 0.58 0.56
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 $ 1.8 $ 19.4
Average foreign exchange rate 0.55 0.57
CDN/GBP | No later than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 5.3 $ 33.4
Average foreign exchange rate 1.74 1.80
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 $ 282.9 $ 132.3
Average foreign exchange rate 1.33 1.28
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 $ 0.0 $ 5.8
Average foreign exchange rate 0.00 1.29
GBP/USD | No later than 1 year    
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 22.0 $ 31.0
Average foreign exchange rate 0.76 0.71
GBP/USD | Between 1 and 3 years    
Disclosure of risk management strategy related to hedge accounting [line items]    
Risk exposure associated with instruments sharing characteristic $ 1.0 $ 12.8
Average foreign exchange rate 0.74 0.76
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 $ 164.2 $ 139.6
Average foreign exchange rate 0.00 0.00
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 $ 0.0 $ 12.3
Average foreign exchange rate 0.00 0.00