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Stock-Based Compensation - Equity Incentive Plan (Narrative) (Details) - Equity Incentive Plan Options shares in Millions, $ in Millions	3 Months Ended	6 Months Ended
	Sep. 30, 2023 USD ($) shares	Sep. 30, 2023 USD ($) shares
Equity Incentive Plan Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)	0.8	0.8
Stock options outstanding, unvested (in shares)	0.3	0.3
Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock granted (in shares)	0.1	0.9
Fair value of options granted | $	$ 7.0	$ 79.3
Performance period	3 years

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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