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FINANCIAL RISK MANAGEMENT - Forward Foreign Currency Contracts (Details) - Currency risk $ in Millions | 12 Months Ended
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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

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