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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Geographic information (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disclosure of operating segments [line items] |  |
Revenue | $ 2,981.9 | $ 3,623.2
Non-current assets other than financial instruments and deferred tax assets | 5,084.2 | 5,371.7
Canada |  |
Disclosure of operating segments [line items] |  |
Revenue | 455.9 | 323.2
Non-current assets other than financial instruments and deferred tax assets | 1,459.1 | 1,449.4
United States |  |
Disclosure of operating segments [line items] |  |
Revenue | 1,324.2 | 1,541.8
Non-current assets other than financial instruments and deferred tax assets | 1,571.1 | 1,845.5
United Kingdom |  |
Disclosure of operating segments [line items] |  |
Revenue | 137.7 | 208.8
Non-current assets other than financial instruments and deferred tax assets | 358.8 | 403.4
Rest of Americas |  |
Disclosure of operating segments [line items] |  |
Revenue | 55.0 | 127.7
Non-current assets other than financial instruments and deferred tax assets | 205.6 | 250.4
Europe |  |
Disclosure of operating segments [line items] |  |
Revenue | 553.2 | 631.7
Non-current assets other than financial instruments and deferred tax assets | 906.2 | 801.0
Asia |  |
Disclosure of operating segments [line items] |  |
Revenue | 381.4 | 707.1
Non-current assets other than financial instruments and deferred tax assets | 501.6 | 586.9
Oceania and Africa |  |
Disclosure of operating segments [line items] |  |
Revenue | 74.5 | 82.9
Non-current assets other than financial instruments and deferred tax assets | $ 81.8 | $ 35.1

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