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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

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- 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 + Details
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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 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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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