DEBT - Interest and Other, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Interest expense	$ 40.8	$ 31.3	$ 75.1	$ 65.8
2024 Notes
Debt Instrument [Line Items]
Interest expense	0.0	2.9	0.0	9.4
2025 Notes
Debt Instrument [Line Items]
Interest expense	5.4	5.4	10.7	10.7
2026 Notes
Debt Instrument [Line Items]
Interest expense	6.8	6.3	13.7	11.6
2027 Notes
Debt Instrument [Line Items]
Interest expense	5.5	5.5	11.1	11.1
2028 Notes
Debt Instrument [Line Items]
Interest expense	9.9	6.2	19.8	11.5
2029 Notes
Debt Instrument [Line Items]
Interest expense	4.0	0.0	4.8	0.0
2032 Notes
Debt Instrument [Line Items]
Interest expense	5.0	5.0	10.0	10.0
2034 Notes
Debt Instrument [Line Items]
Interest expense	4.2	0.0	5.0	0.0
Term Loan
Debt Instrument [Line Items]
Interest expense	$ 0.0	$ 0.0	$ 0.0	$ 1.5