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INCOME TAXES - Loss Carryforwards (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Operating loss carryforwards
Valuation allowance	$ 248.2
Total amount of undistributed earnings of foreign subsidiaries	180.5	$ 492.5
Domestic
Operating loss carryforwards
Net operating loss carryforwards	548.9
Domestic \| Expire 2026 to 2029
Operating loss carryforwards
Net operating loss carryforwards	35.9
Domestic \| Expire from 2030 to 2040
Operating loss carryforwards
Net operating loss carryforwards	190.7
Domestic \| Expire from 2041 to 2044
Operating loss carryforwards
Net operating loss carryforwards	178.4
Foreign
Operating loss carryforwards
Net operating loss carryforwards	286.4
Foreign \| Expire 2026 to 2032
Operating loss carryforwards
Net operating loss carryforwards	197.8
Foreign \| Expire 2042 to 2044
Operating loss carryforwards
Net operating loss carryforwards	15.9
Domestic Tax Jurisdiction
Operating loss carryforwards
Tax credit carryforward	436.4
Domestic Tax Jurisdiction \| Expire 2026 to 2028
Operating loss carryforwards
Tax credit carryforward	0.2
Domestic Tax Jurisdiction \| Expire 2043 to 2046
Operating loss carryforwards
Tax credit carryforward	104.5
Domestic Tax Jurisdiction \| Expire 2034 to 2042
Operating loss carryforwards
Tax credit carryforward	$ 12.0