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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 |  |

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