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Treasury Stock - Schedule of repurchase of common stock (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended	12 Months Ended
	Nov. 30, 2024	Aug. 31, 2024	Nov. 30, 2023	Aug. 31, 2023	Nov. 30, 2024	Nov. 30, 2024	Mar. 20, 2024	Dec. 13, 2023
Equity, Class of Treasury Stock [Line Items]
Authorized amount of stock to be repurchased	$ 120.8				$ 120.8	$ 120.8	$ 54.6
Less repurchases made under these authorizations	(5.0)	$ (5.0)	$ (52.3)	$ (36.2)	(10.0)
Remaining Board authorization at November 30, 2024	$ 76.6				$ 76.6	76.6
Board Authorized 2023 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Authorized amount of stock to be repurchased								$ 66.2
Board Authorized 2024 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Authorized amount of stock to be repurchased							$ 54.6
Under all Board Authorizations
Equity, Class of Treasury Stock [Line Items]
Less repurchases made under these authorizations						$ (44.2)

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Amount of 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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

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

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