DEBT FACILITIES (Tables)

12 Months Ended

Mar. 31, 2024

Debt and Financing Obligations [Abstract]

Disclosure of detailed information about borrowings

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


			Repayment					2024				2023
Notional amount				period		Current	Non-current			Current	Non-current
Unsecured senior notes
U.S. dollar, fixed rate - 3.60% to 4.90%	US$	933.0		2024-2034	$	190.5	$	1,068.8	$	18.5	$	1,257.9
Canadian dollar, Series 1, fixed rate - 5.541%	$	400.0		2028		—		397.5		—		—
Canadian dollar, fixed rate - 4.15%	$	21.5		2024-2027		12.9		8.6		2.9		21.4

Term loans
U.S. dollar, variable rate	US$	125.0		2025		—		168.9		67.0		405.4
Canadian dollar, variable rate	$	23.9		2024-2028		5.6		18.3		5.6		23.8
Other				2024-2026		14.3		32.8		15.2		47.4
Lease liabilities
U.S. dollar				2024-2071		30.2		368.2		55.7		241.3
Other				2024-2043		25.0		128.5		25.5		133.4

R&D obligations
Canadian dollar				2023-2048		30.4		543.8		24.2		471.9
Revolving credit facilities
U.S. dollar, variable rate						—		—		—		433.0
Canadian dollar, variable rate						—		30.0		—		—
Total long-term debt					$	308.9	$	2,765.4	$	214.6	$	3,035.5

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, 2022	$	1,221.0	$	620.3	$	395.0	$	473.0	$	336.9	$	3,046.2
Changes from financing cash flows
Net repayment from borrowing under
revolving credit facilities		—		—		—		—		44.5		44.5
Proceeds from long-term debt		—		—		—		31.2		—		31.2
Repayment of long-term debt		(21.8)		(106.1)		—		(33.1)		—		(161.0)
Repayment of lease liabilities		—		—		(83.4)		—		—		(83.4)
Total changes from financing cash flows	$	(21.8)	$	(106.1)	$	(83.4)	$	(1.9)	$	44.5	$	(168.7)
Non-cash changes

Foreign currency exchange differences		101.1		48.9		21.7		—		51.6		223.3
Additions and remeasurement of lease liabilities		—		—		128.2		—		—		128.2
Accretion		—		—		—		25.0		—		25.0
Other		0.4		1.3		(5.6)		—		—		(3.9)
Total non-cash changes	$	101.5	$	50.2	$	144.3	$	25.0	$	51.6	$	372.6


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 proceeds 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 remeasurement of lease liabilities		—		—		177.2		—		—		177.2
Disposal of discontinued operations (Note 2)		—		—		(12.2)		—		—		(12.2)
Accretion		—		—		—		27.9		—		27.9
Transfer from royalty obligations (Note 2)		—		—		—		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