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Treasury Stock - Schedule of repurchase of common stock (Details) - USD ($) $ in Millions	3 Months Ended		41 Months Ended
	Aug. 31, 2023	Aug. 31, 2022	Aug. 31, 2023	Jul. 19, 2023	Mar. 22, 2023
Equity, Class of Treasury Stock [Line Items]
Authorized amount of stock to be repurchased	$ 150.0		$ 150.0	$ 100.0
Less repurchases made under these authorizations	(36.2)	$ (5.1)
Remaining Board authorization at August 31, 2023	$ 85.7		85.7
Board Authorized 2023 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Authorized amount of stock to be repurchased					$ 50.0
Board Authorized 2024 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Authorized amount of stock to be repurchased				$ 100.0
Under all Board Authorizations
Equity, Class of Treasury Stock [Line Items]
Less repurchases made under these authorizations			$ (64.3)

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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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-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
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-Publisher FASB
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-Name Accounting Standards Codification
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-SubTopic 30
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481549/505-30-45-1

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