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Treasury Stock - Schedule of repurchase of common stock (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended	23 Months Ended
	Feb. 28, 2026	Feb. 28, 2025	Nov. 30, 2024	Aug. 31, 2024	Feb. 28, 2026	Feb. 28, 2026	Dec. 17, 2025	Mar. 19, 2025	Mar. 20, 2024
Equity, Class of Treasury Stock [Line Items]
Authorized amount of stock to be repurchased	$ 188.0				$ 188.0	$ 188.0
Less repurchases made under these authorizations	(131.8)	$ (30.6)	$ (5.0)	$ (5.0)	(131.8)
Remaining Board authorization at February 28, 2026	$ 19.5				$ 19.5	19.5
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						$ (168.5)
Board Authorized March 2025 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Authorized amount of stock to be repurchased								$ 53.4
Board Authorized December 2025 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Authorized amount of stock to be repurchased							$ 80.0

X

- Definition

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481520/505-30-50-4

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Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

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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.

+ References

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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