DEBT FACILITIES (Tables)

12 Months Ended

Mar. 31, 2025

Debt and Financing Obligations [Abstract]

Disclosure of detailed information about borrowings

Long-term debt, net of transaction costs is as follows:


			Repayment					2025				2024
Notional amount				period		Current	Non-current			Current	Non-current
Unsecured senior notes
U.S. dollar, fixed rate - 3.60% to 4.90%	US$	792.0		2025-2034	$	20.0	$	1,114.7	$	190.5	$	1,068.8
Canadian dollar, Series 1, fixed rate - 5.54%	$	400.0		2028		—		398.1		—		397.5
Canadian dollar, fixed rate - 4.15%	$	8.6		2025-2027		2.9		5.7		12.9		8.6

Term loans
U.S. dollar, variable rate	US$	325.0		2025-2026		178.7		288.3		—		168.9
Canadian dollar, variable rate	$	18.3		2025-2028		5.6		12.6		5.6		18.3
Other				2025-2026		33.5		—		14.3		32.8
Lease liabilities
U.S. dollar				2025-2071		92.0		432.0		30.2		368.2
Other				2025-2054		29.1		239.0		25.0		128.5

R&D obligations
Canadian dollar				2025-2048		37.2		581.0		30.4		543.8
Revolving credit facilities
U.S. dollar, variable rate						—		—		—		—
Canadian dollar, variable rate						—		—		—		30.0
Total long-term debt					$	399.0	$	3,071.4	$	308.9	$	2,765.4

Disclosure of reconciliation of liabilities arising from financing activities

Information on the change in long-term debt for which cash flows have been classified as financing activities in the statement of cash flows are as follows:


	Unsecured								Revolving
		senior		Term		Lease		R&D		credit
		notes		loans		liabilities	obligations			facility		Total
Net book value as at March 31, 2023	$	1,300.7	$	564.4	$	455.9	$	496.1	$	433.0	$	3,250.1
Changes from financing cash flows
Net repayment from borrowing under
revolving credit facilities		—		—		—		—		(396.7)		(396.7)
Proceeds from long-term debt		397.1		—		—		36.4		—		433.5
Repayment of long-term debt		(21.7)		(324.0)		—		(24.7)		—		(370.4)
Repayment of lease liabilities		—		—		(69.5)		—		—		(69.5)
Total changes from financing cash flows	$	375.4	$	(324.0)	$	(69.5)	$	11.7	$	(396.7)	$	(403.1)
Non-cash changes

Foreign currency exchange differences		1.2		(1.3)		0.5		—		(6.3)		(5.9)
Additions and remeasurements of lease liabilities		—		—		177.2		—		—		177.2
Disposal of discontinued operations (Note 3)		—		—		(12.2)		—		—		(12.2)
Accretion		—		—		—		27.9		—		27.9
Transfer from royalty obligations (Note 3)		—		—		—		36.9		—		36.9
Other		1.0		0.8		—		1.6		—		3.4
Total non-cash changes	$	2.2	$	(0.5)	$	165.5	$	66.4	$	(6.3)	$	227.3


Net book value as at March 31, 2024	$	1,678.3	$	239.9	$	551.9	$	574.2	$	30.0	$	3,074.3
Changes from financing cash flows
Net repayment from borrowing under
revolving credit facilities		—		—		—		—		(45.0)		(45.0)
Proceeds from long-term debt		—		285.8		—		45.7		—		331.5
Repayment of long-term debt		(216.1)		(72.6)		—		(32.6)		—		(321.3)
Repayment of lease liabilities		—		—		(59.9)		—		—		(59.9)
Total changes from financing cash flows	$	(216.1)	$	213.2	$	(59.9)	$	13.1	$	(45.0)	$	(94.7)
Non-cash changes
Business combinations (Note 2)		—		48.5		110.0		—		—		158.5
Foreign currency exchange differences		78.1		16.3		36.7		—		15.0		146.1
Additions and remeasurements of lease liabilities		—		—		153.4		—		—		153.4

Accretion		—		—		—		32.5		—		32.5

Other		1.1		0.8		—		(1.6)		—		0.3
Total non-cash changes	$	79.2	$	65.6	$	300.1	$	30.9	$	15.0	$	490.8
Net book value as at March 31, 2025	$	1,541.4	$	518.7	$	792.1	$	618.2	$	—	$	3,470.4