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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Geographic information (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Disclosure of operating segments [line items] |  |
External revenue | $ 4,282.8 | $ 4,010.6
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets | 7,340.0 | 7,870.4
Canada |  |
Disclosure of operating segments [line items] |  |
External revenue | 460.7 | 361.2
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets | 1,527.7 | 1,641.2
United States |  |
Disclosure of operating segments [line items] |  |
External revenue | 2,076.3 | 2,059.5
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets | 3,623.5 | 4,049.8
United Kingdom |  |
Disclosure of operating segments [line items] |  |
External revenue | 271.1 | 251.1
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets | 360.5 | 383.9
Rest of Americas |  |
Disclosure of operating segments [line items] |  |
External revenue | 98.8 | 86.1
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets | 201.9 | 180.8
Europe |  |
Disclosure of operating segments [line items] |  |
External revenue | 645.1 | 559.7
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets | 985.5 | 982.4
Asia |  |
Disclosure of operating segments [line items] |  |
External revenue | 566.1 | 603.7
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets | 532.0 | 519.8
Oceania and Africa |  |
Disclosure of operating segments [line items] |  |
External revenue | 164.7 | 89.3
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets | $ 108.9 | $ 112.5

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