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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Geographic information (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disclosure of operating segments [line items] |  |
Revenue | $ 3,304.1 | $ 2,823.5
Non-current assets other than financial instruments and deferred tax assets | 4,791.5 | 3,388.2
Canada |  |
Disclosure of operating segments [line items] |  |
Revenue | 253.3 | 265.5
Non-current assets other than financial instruments and deferred tax assets | 1,557.0 | 903.2
United States |  |
Disclosure of operating segments [line items] |  |
Revenue | 1,283.3 | 1,068.2
Non-current assets other than financial instruments and deferred tax assets | 1,580.7 | 945.7
Brazil |  |
Disclosure of operating segments [line items] |  |
Non-current assets other than financial instruments and deferred tax assets | 116.4 | 118.1
United Kingdom |  |
Disclosure of operating segments [line items] |  |
Revenue | 210.4 | 231.4
Non-current assets other than financial instruments and deferred tax assets | 285.2 | 250.3
Germany |  |
Disclosure of operating segments [line items] |  |
Revenue | 118.9 | 95.7
Luxembourg |  |
Disclosure of operating segments [line items] |  |
Non-current assets other than financial instruments and deferred tax assets | 187.0 | 194.1
Netherlands |  |
Disclosure of operating segments [line items] |  |
Revenue | 79.7 | 95.7
Non-current assets other than financial instruments and deferred tax assets | 196.9 | 223.6
Spain |  |
Disclosure of operating segments [line items] |  |
Revenue | 114.5 | 76.0
Other European countries |  |
Disclosure of operating segments [line items] |  |
Revenue | 367.7 | 250.9
Non-current assets other than financial instruments and deferred tax assets | 336.5 | 324.8
Malaysia |  |
Disclosure of operating segments [line items] |  |
Non-current assets other than financial instruments and deferred tax assets | 177.6 | 197.1
United Arab Emirates |  |
Disclosure of operating segments [line items] |  |
Revenue | 109.0 | 110.0
China |  |
Disclosure of operating segments [line items] |  |
Revenue | 226.5 | 207.6
Other Asian countries |  |
Disclosure of operating segments [line items] |  |
Revenue | 361.1 | 268.2
Non-current assets other than financial instruments and deferred tax assets | 177.8 | 149.2
Australia |  |
Disclosure of operating segments [line items] |  |
Revenue | 50.1 | 55.8
Other countries |  |
Disclosure of operating segments [line items] |  |
Revenue | 129.6 | 98.5
Non-current assets other than financial instruments and deferred tax assets | $ 176.4 | $ 82.1

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