DEBT - Long-term Debt, Net (Details) - USD ($) $ in Millions	Jun. 30, 2025	Mar. 31, 2025
Debt Instrument [Line Items]
Total	$ 2,531.1	$ 2,528.5
Unamortized discount and issuance costs	(15.0)	(15.9)
Long-term debt, net	2,516.1	2,512.6
Significant other observable inputs (level 2)
Debt Instrument [Line Items]
Total	$ 2,536.9	$ 2,513.6
2027 Notes
Debt Instrument [Line Items]
Annual Interest Rate	3.70%	3.70%
Total	$ 600.0	$ 600.0
2027 Notes | Significant other observable inputs (level 2)
Debt Instrument [Line Items]
Total	$ 595.1	$ 590.8
2028 Notes
Debt Instrument [Line Items]
Annual Interest Rate	4.95%	4.95%
Total	$ 800.0	$ 800.0
2028 Notes | Significant other observable inputs (level 2)
Debt Instrument [Line Items]
Total	$ 813.3	$ 808.5
2029 Notes
Debt Instrument [Line Items]
Annual Interest Rate	5.40%	5.40%
Total	$ 300.0	$ 300.0
2029 Notes | Significant other observable inputs (level 2)
Debt Instrument [Line Items]
Total	$ 309.9	$ 308.3
2032 Notes
Debt Instrument [Line Items]
Annual Interest Rate	4.00%	4.00%
Total	$ 500.0	$ 500.0
2032 Notes | Significant other observable inputs (level 2)
Debt Instrument [Line Items]
Total	$ 475.6	$ 468.6
2034 Notes
Debt Instrument [Line Items]
Annual Interest Rate	5.60%	5.60%
Total	$ 300.0	$ 300.0
2034 Notes | Significant other observable inputs (level 2)
Debt Instrument [Line Items]
Total	$ 311.9	$ 308.9
2026 Convertible Notes
Debt Instrument [Line Items]
Annual Interest Rate	0.00%	0.00%
Total	$ 31.1	$ 28.5
2026 Convertible Notes | Significant other observable inputs (level 2)
Debt Instrument [Line Items]
Total	$ 31.1	$ 28.5