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Consolidated Statement of Comprehensive (Loss) Income - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Statement of comprehensive income [abstract]    
Net income $ 231.9 $ 150.0
Items that may be reclassified to net income    
Foreign currency exchange differences on translation of foreign operations 331.1 (101.4)
Net (loss) gain on hedges of net investment in foreign operations (112.6) 15.8
Reclassification to income of gains on foreign currency exchange differences (6.4) (4.7)
Net loss on cash flow hedges (14.0) (6.0)
Reclassification to income of gains on cash flow hedges (5.5) (7.0)
Income taxes 9.9 (2.0)
Items that may be reclassified to net income 202.5 (105.3)
Items that will never be reclassified to net income    
Remeasurement of defined benefit pension plan obligations 74.2 125.6
Net loss on financial assets carried at fair value through OCI 0.0 (0.1)
Income taxes (19.7) (33.4)
Items that will never be reclassified to net income 54.5 92.1
Other comprehensive income (loss) 257.0 (13.2)
Total comprehensive income 488.9 136.8
Attributable to:    
Equity holders of the Company 475.6 129.8
Non-controlling interests $ 13.3 $ 7.0