Share-Based Compensation - Employee Stock Purchase Plan (Details) - Employee Stock Purchase Plans - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation arrangement by share based payment award, market price offering date percentage	85.00%
Common stock, capital shares reserved for future issuance (in shares)	35,548,364
Number of shares available for grant (in shares)	8,677,504
Stock issued during period, shares, employee stock purchase plans (in shares)	1,375,324	1,424,850	1,485,477
Stock issued during period, value, employee stock purchase plan	$ 81.7	$ 81.2	$ 70.0
Unvested share-based payment awards	$ 7.6
Weighted average remaining expense recognition period (in years)	5 months