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OPERATING SEGMENTS AND GEOGRAPHIC INFORMATION - Geographic information (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Disclosure of operating segments [line items] |  |
External revenue | $ 4,707.9 | $ 4,282.8
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets | 8,658.5 | 7,340.0
Canada |  |
Disclosure of operating segments [line items] |  |
External revenue | 474.2 | 460.7
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets | 1,541.7 | 1,527.7
United States |  |
Disclosure of operating segments [line items] |  |
External revenue | 2,241.8 | 2,076.3
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets | 4,534.7 | 3,623.5
United Kingdom |  |
Disclosure of operating segments [line items] |  |
External revenue | 281.6 | 271.1
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets | 399.0 | 360.5
Rest of Americas |  |
Disclosure of operating segments [line items] |  |
External revenue | 133.0 | 98.8
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets | 221.8 | 201.9
Europe |  |
Disclosure of operating segments [line items] |  |
External revenue | 663.6 | 645.1
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets | 1,162.3 | 985.5
Asia |  |
Disclosure of operating segments [line items] |  |
External revenue | 759.9 | 566.1
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets | 610.8 | 532.0
Oceania and Africa |  |
Disclosure of operating segments [line items] |  |
External revenue | 153.8 | 164.7
Non-current assets other than financial instruments, deferred tax assets and employee benefits assets | $ 188.2 | $ 108.9

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