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Treasury Stock - Narrative (Details) $ / shares in Units, $ in Millions		1 Months Ended	12 Months Ended
	May 31, 2023 USD ($)	Nov. 22, 2022 USD ($) $ / shares shares	May 31, 2023 USD ($)	May 31, 2022 USD ($)	May 31, 2021 USD ($)	Mar. 31, 2023 USD ($)	Mar. 22, 2023 USD ($)	Dec. 14, 2022 USD ($)
Equity, Class of Treasury Stock [Line Items]
Total current Board authorizations	$ 148.8		$ 148.8
Shares of stock repurchased (in shares) | shares		533,793
Average cost of stock repurchased (in Dollars per share) | $ / shares		$ 40.00
Less repurchases made under the authorizations as of May 31, 2023	127.2	$ 23.3	135.1	$ 33.4	$ 0.0
Common stock, amount repurchased, percent of shares outstanding		0.016
Excise tax on stock repurchased	$ 0.6		$ 0.6
Board Authorized 2020 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Total current Board authorizations						$ 50.0	$ 50.0	$ 48.8

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Common stock, Amount Repurchased, Percent Of Shares Outstanding

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Amount of stock repurchase plan authorized.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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