Restructuring and Other - Schedule of Changes in Restructuring and Other Severance Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Restructuring and Other Severance Liability
Amount included in restructuring and other	$ 4.9	$ 7.7	$ 4.2
Restructuring Incurred Cost Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed	Accruals(2)	Accruals(2)	Accruals(2)
Severance liability
Restructuring and Other Severance Liability
Beginning balance	$ 19.3	$ 3.7	$ 0.8
Accruals	32.1	27.5	10.8
Severance payments	(27.9)	(11.9)	(7.9)
Ending balance	23.5	$ 19.3	$ 3.7
Remaining severance liability, expected to be paid in next 12 months	$ 23.5