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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Computation of Basic and diluted loss per share:
Net loss	$ (133.9)	$ (365.5)	$ (145.8)	$ (627.5)
Weighted average shares outstanding—basic (in shares)	184.6	175.4	182.7	173.8
Basic loss per share (in dollars per share)	$ (0.73)	$ (2.08)	$ (0.80)	$ (3.61)
Diluted loss per share (in dollars per share)	$ (0.73)	$ (2.08)	$ (0.80)	$ (3.61)