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Share-Based Compensation - Employee Stock Purchase Plan (Details) - Employee Stock Purchase Plans - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
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%
Shares authorized (in shares)	36,088,751
Number of shares available for grant (in shares)	8,115,202
Stock issued during period, shares, employee stock purchase plans (in shares)	1,102,689	1,375,324	1,424,850
Stock issued during period, value, employee stock purchase plan	$ 65.5	$ 81.7	$ 81.2
Unvested share-based payment awards	$ 6.6
Weighted average remaining expense recognition period (in years)	5 months

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