DEBT - Long-term Debt, Net (Details) - USD ($) $ in Millions	Jun. 30, 2026	Mar. 31, 2026
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,900.0	$ 2,500.0
Unamortized discount and issuance cost	(10.2)	(12.0)
Long-term debt, net	1,889.8	2,488.0
Significant other observable inputs (level 2)
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,893.9	$ 2,490.8
2027 Notes
Debt Instrument [Line Items]
Annual Interest Rate	3.70%	3.70%
Long-term debt, gross		$ 600.0
2027 Notes | Significant other observable inputs (level 2)
Debt Instrument [Line Items]
Long-term debt, gross		$ 594.6
2028 Notes
Debt Instrument [Line Items]
Annual Interest Rate	4.95%	4.95%
Long-term debt, gross	$ 800.0	$ 800.0
2028 Notes | Significant other observable inputs (level 2)
Debt Instrument [Line Items]
Long-term debt, gross	$ 804.1	$ 807.3
2029 Notes
Debt Instrument [Line Items]
Annual Interest Rate	5.40%	5.40%
Long-term debt, gross	$ 300.0	$ 300.0
2029 Notes | Significant other observable inputs (level 2)
Debt Instrument [Line Items]
Long-term debt, gross	$ 305.7	$ 306.6
2032 Notes
Debt Instrument [Line Items]
Annual Interest Rate	4.00%	4.00%
Long-term debt, gross	$ 500.0	$ 500.0
2032 Notes | Significant other observable inputs (level 2)
Debt Instrument [Line Items]
Long-term debt, gross	$ 477.0	$ 477.0
2034 Notes
Debt Instrument [Line Items]
Annual Interest Rate	5.60%	5.60%
Long-term debt, gross	$ 300.0	$ 300.0
2034 Notes | Significant other observable inputs (level 2)
Debt Instrument [Line Items]
Long-term debt, gross	$ 307.1	$ 305.3