DEBT - Short-term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2026	Mar. 31, 2026
Debt Instrument [Line Items]
Short-term debt, gross	$ 630.7	$ 30.0
Unamortized discount and issuance cost	(0.8)	0.0
Short-term debt, net	629.9	30.0
Significant other observable inputs (level 2)
Debt Instrument [Line Items]
Short-term debt, gross	$ 627.7	$ 30.0
2027 Notes
Debt Instrument [Line Items]
Annual Interest Rate	3.70%	3.70%
Short-term debt, gross	$ 600.0
2027 Notes | Significant other observable inputs (level 2)
Debt Instrument [Line Items]
Short-term debt, gross	$ 597.0
2026 Convertible Notes
Debt Instrument [Line Items]
Annual Interest Rate	0.00%	0.00%
Short-term debt, gross	$ 30.7	$ 30.0
2026 Convertible Notes | Significant other observable inputs (level 2)
Debt Instrument [Line Items]
Short-term debt, gross	$ 30.7	$ 30.0