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Treasury Stock - Schedule of repurchase of common stock (Details) - USD ($) $ in Millions	10 Months Ended	12 Months Ended
	May 31, 2024	May 31, 2025	May 31, 2024	May 31, 2023	Mar. 19, 2025	Mar. 20, 2024	Dec. 13, 2023
Equity, Class of Treasury Stock [Line Items]
Total current Board authorizations		$ 174.2
Purchases of treasury stock at cost	$ (104.2)	(70.9)	$ (156.8)	$ (135.1)
Remaining Board authorization at May 31, 2025		$ 70.0
Board Authorized 2024 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Total current Board authorizations					$ 53.4	$ 54.6	$ 66.2

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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+ References

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- Definition

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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- Definition

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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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
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