DEBT - Short-term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2024	Mar. 31, 2024
Debt Instrument [Line Items]
Total	$ 600.0	$ 24.6
Unamortized discount and issuance costs	(0.8)	0.0
Short-term debt, net	599.2	24.6
Significant other observable inputs (level 2)
Debt Instrument [Line Items]
Total	$ 596.2	$ 24.6
2025 Notes
Debt Instrument [Line Items]
Annual Interest Rate	3.55%	3.55%
Total	$ 600.0
2025 Notes | Significant other observable inputs (level 2)
Debt Instrument [Line Items]
Total	$ 596.2
2024 Convertible Notes
Debt Instrument [Line Items]
Annual Interest Rate		0.25%
Total		$ 24.6
2024 Convertible Notes | Significant other observable inputs (level 2)
Debt Instrument [Line Items]
Total		$ 24.6
2034 Notes
Debt Instrument [Line Items]
Annual Interest Rate	5.60%