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Treasury Stock - Schedule of repurchase of common stock (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	May 31, 2023	Nov. 22, 2022	May 31, 2023	May 31, 2022	May 31, 2021	Mar. 31, 2023	Mar. 22, 2023	Dec. 14, 2022	Mar. 18, 2020
Equity, Class of Treasury Stock [Line Items]
Total current Board authorizations	$ 148.8		$ 148.8
Purchases of treasury stock at cost	(127.2)	$ (23.3)	(135.1)	$ (33.4)	$ 0.0
Remaining Board authorization at May 31, 2023	$ 21.6		$ 21.6
Board Authorized 2018 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Total current Board authorizations									$ 50.0
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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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-SubTopic 10
-Topic 505
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-2

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-Name Accounting Standards Codification
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-Publisher FASB
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-SubTopic 30
-Section 45
-Paragraph 1
-Publisher FASB
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