LOSS PER SHARE - Computation of Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Computation of Basic and diluted loss per share:
Net loss	$ (365.5)	$ (543.6)	$ (627.5)	$ (749.6)
Weighted average shares outstanding—basic (in shares)	175.4	169.9	173.8	169.6
Basic loss per share (in dollars per share)	$ (2.08)	$ (3.20)	$ (3.61)	$ (4.42)
Diluted loss per share (in dollars per share)	$ (2.08)	$ (3.20)	$ (3.61)	$ (4.42)