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Consolidated Statement of Comprehensive (Loss) Income - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement of comprehensive income [abstract]    
Net Income (loss) $ (47.5) $ 318.9
Items that may be reclassified to net (loss) income    
Foreign currency exchange differences on translation of foreign operations (284.8) 118.3
Net gain (loss) on hedges of net investment in foreign operations 140.4 (71.0)
Reclassification to income of foreign currency exchange differences (21.2) (40.4)
Net gain (loss) on cash flow hedges 61.4 (32.3)
Reclassification to income of loss on cash flow hedges (20.3) (0.2)
Income taxes (14.6) 23.0
Items that may be reclassified to net (loss) income (139.1) (2.6)
Items that will never be reclassified to net (loss) income    
Remeasurement of defined benefit pension plan obligations 1.1 13.4
Net loss on financial assets carried at fair value through OCI (1.8) 0.0
Income taxes (0.3) (3.6)
Items that will never be reclassified to net (loss) income (1.0) 9.8
Other comprehensive (loss) income (140.1) 7.2
Total comprehensive (loss) income (187.6) 326.1
Attributable to:    
Equity holders of the Company (181.5) 315.4
Non-controlling interests $ (6.1) $ 10.7