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Share-Based Compensation - Equity Incentive Plans, Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Number of Shares
Outstanding at beginning of period (in shares)	140,994	298,020	563,764
Exercised (in shares)	(39,874)	(155,768)	(260,838)
Forfeited or expired (in shares)	(1,788)	(1,258)	(4,906)
Outstanding at end of period (in shares)	99,332	140,994	298,020
Weighted Average Exercise Price per Share
Outstanding at beginning of period (in dollars per share)	$ 15.91	$ 15.80	$ 15.08
Exercised (in dollars per share)	13.96	15.74	14.36
Forfeited or expired (in dollars per share)	17.82	9.74	10.01
Outstanding at end of period (in dollars per share)	16.65	$ 15.91	$ 15.80
Share price (in dollars per share)	$ 75.14
Weighted average remaining contractual term	1 year 4 months 13 days
Employee Stock Option
Weighted Average Exercise Price per Share
Total intrinsic value of options exercised related to stock incentive plans	$ 2.6	$ 6.5	$ 8.4
Aggregate intrinsic value of options outstanding related to stock incentive plans	$ 7.5
Weighted average exercise price per share of exercisable options (in dollars per share)	$ 16.65	$ 15.91
Exercisable number of option shares (in shares)	99,332	140,994

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Weighted average price of options that were either forfeited or expired.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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