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DEBT FACILITIES - Long-term Debt (Details) | Mar. 31, 2021 CAD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 CAD ($)
--- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |
Current | $ 216,300,000 |  | $ 206,200,000
Non-current | 2,135,200,000 |  | 3,106,000,000.0
U.S. dollar, fixed rate - 3.60% to 4.90% |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notional amount |  | $ 975,000,000.0 |
Current | 17,200,000 |  | 0
Non-current | $ 1,202,300,000 |  | 1,370,400,000
U.S. dollar, fixed rate - 3.60% to 4.90% | Bottom of range |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings, interest rate | 3.60% | 3.60% |
U.S. dollar, fixed rate - 3.60% to 4.90% | Top of range |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings, interest rate | 4.90% | 4.90% |
Canadian dollar, fixed rate - 4.15% |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings, interest rate | 4.15% | 4.15% |
Notional amount | $ 30,000,000.0 |  |
Current | 2,900,000 |  | 0
Non-current | 27,100,000 |  | 30,000,000.0
U.S. dollar, variable rate |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notional amount |  | $ 176,400,000 |
Current | 71,200,000 |  | 79,700,000
Non-current | 149,300,000 |  | 177,100,000
Canadian dollar, variable rate |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notional amount | 40,900,000 |  |
Current | 5,600,000 |  | 5,600,000
Non-current | 35,100,000 |  | 40,700,000
Other |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 15,300,000 |  | 8,200,000
Non-current | 54,700,000 |  | 7,900,000
U.S. dollar |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 60,800,000 |  | 91,700,000
Non-current | 110,700,000 |  | 214,400,000
Other |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 27,000,000.0 |  | 21,000,000.0
Non-current | 148,700,000 |  | 160,700,000
Canadian dollar |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 16,300,000 |  | 0
Non-current | 407,300,000 |  | 391,500,000
U.S. dollar, variable rate |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 0 |  | 0
Non-current | 0 |  | 423,300,000
Canadian dollar, variable rate |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Current | 0 |  | 0
Non-current | $ 0 |  | $ 290,000,000.0

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