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FINANCIAL RISK MANAGEMENT - Narrative (Details) shares in Millions, $ in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 CAD ($) shares | Mar. 31, 2020 CAD ($) shares | Mar. 31, 2021 USD ($) | May 19, 2020 USD ($) | Mar. 31, 2020 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Accounts receivable, maximum amount available to sell |  |  |  | $ 400.0 | $ 300.0
Accounts receivable, amount sold to financial institution | $ 298.8 | $ 333.1 |  |  |
Accounts receivable, amount sold to financial institution, fees | 26.4 | 38.8 |  |  |
Net Income (loss) | (47.5) | 318.9 |  |  |
Other comprehensive (loss) income | $ (140.1) | $ 7.2 |  |  |
Equity swap agreement, common shares (in shares) | shares | 2.5 | 2.8 |  |  |
Letters of credit and guarantees, net | $ 196.2 | $ 189.6 |  |  |
Bottom of range |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Terms of Indemnifications | 1 year |  |  |  |
Top of range |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Terms of Indemnifications | 2 years |  |  |  |
Revolving Unsecured Term Credit Facility, September 2022 |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 500.0 |  | $ 850.0 |  | $ 850.0
Foreign currency and interest rate swap agreements |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Debt, fixed interest rate | 94.00% | 74.00% | 94.00% |  | 74.00%
Currency risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Foreign currency strengthening change | 5.00% |  | 5.00% |  |
Foreign currency rate change, based on weakening of foreign currency | 5.00% |  | 5.00% |  |
Interest rate risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Sensitivity analysis to interest rate change | 1.00% |  |  |  |
Net Income (loss) | $ (1.7) | $ (5.7) |  |  |
Other comprehensive (loss) income | $ 0.0 | $ 0.0 |  |  |
Sensitivity analysis to interest rate change, decrease | 1.00% |  |  |  |
Hedges Of Net Investment In US Entities |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Debt |  |  | $ 862.8 |  | $ 862.8
Gross finance lease obligations |  |  | $ 23.9 |  | $ 48.1

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