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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Geographic information (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disclosure of operating segments [line items] |  |
Revenue | $ 2,830.0 | $ 2,704.5
Non-current assets other than financial instruments and deferred tax assets | 3,390.0 | 3,181.3
CANADA |  |
Disclosure of operating segments [line items] |  |
Revenue | 253.6 | 269.9
Non-current assets other than financial instruments and deferred tax assets | 904.6 | 1,051.1
UNITED STATES |  |
Disclosure of operating segments [line items] |  |
Revenue | 1,049.7 | 981.3
Non-current assets other than financial instruments and deferred tax assets | 946.1 | 988.1
BRAZIL |  |
Disclosure of operating segments [line items] |  |
Non-current assets other than financial instruments and deferred tax assets | 118.1 | 124.9
UNITED KINGDOM |  |
Disclosure of operating segments [line items] |  |
Revenue | 232.8 | 270.2
Non-current assets other than financial instruments and deferred tax assets | 250.3 | 218.0
GERMANY |  |
Disclosure of operating segments [line items] |  |
Revenue | 95.6 | 83.8
LUXEMBOURG |  |
Disclosure of operating segments [line items] |  |
Non-current assets other than financial instruments and deferred tax assets | 194.1 | 182.9
NETHERLANDS |  |
Disclosure of operating segments [line items] |  |
Revenue | 95.8 | 88.7
Non-current assets other than financial instruments and deferred tax assets | 223.6 | 159.0
Other European Countries |  |
Disclosure of operating segments [line items] |  |
Revenue | 337.6 | 320.4
Non-current assets other than financial instruments and deferred tax assets | 324.8 | 274.0
MALAYSIA |  |
Disclosure of operating segments [line items] |  |
Non-current assets other than financial instruments and deferred tax assets | 197.1 | 0.1
UNITED ARAB EMIRATES |  |
Disclosure of operating segments [line items] |  |
Revenue | 102.8 | 70.5
CHINA |  |
Disclosure of operating segments [line items] |  |
Revenue | 220.0 | 158.5
Other Asian Countries |  |
Disclosure of operating segments [line items] |  |
Revenue | 289.5 | 321.2
Non-current assets other than financial instruments and deferred tax assets | 149.2 | 109.0
AUSTRALIA |  |
Disclosure of operating segments [line items] |  |
Revenue | 52.7 | 65.0
Other Countries |  |
Disclosure of operating segments [line items] |  |
Revenue | 99.9 | 75.0
Non-current assets other than financial instruments and deferred tax assets | $ 82.1 | $ 74.2

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