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Treasury Stock - Schedule of repurchase of common stock (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2023 | Nov. 22, 2022 | May 31, 2023 | May 31, 2022 | May 31, 2021 | Mar. 31, 2023 | Mar. 22, 2023 | Dec. 14, 2022 | Mar. 18, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Total current Board authorizations | $ 148.8 |  | $ 148.8 |  |  |  |  |  |
Purchases of treasury stock at cost | (127.2) | $ (23.3) | (135.1) | $ (33.4) | $ 0.0 |  |  |  |
Remaining Board authorization at May 31, 2023 | $ 21.6 |  | $ 21.6 |  |  |  |  |  |
Board Authorized 2018 Share Repurchase Program |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Total current Board authorizations |  |  |  |  |  |  |  |  | $ 50.0
Board Authorized 2020 Share Repurchase Program |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |
Total current Board authorizations |  |  |  |  |  | $ 50.0 | $ 50.0 | $ 48.8 |

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