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Employee Benefit Plans - Schedule of changes in fair value level 3 assets (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2023
May 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 4.2 $ 6.0
Actual Return on Plan Assets:    
Relating to assets still held at year-end (0.9) (1.2)
Relating to assets sold during the year 0.0 0.0
Purchases, sales and settlements, net 0.0 0.0
Transfers in and/or out of Level 3 0.0 0.0
Foreign currency translation (0.0) 0.6
Ending Balance $ 3.3 $ 4.2