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Employee Benefit Plans - Schedule of change in fair value of plan assets (Details) - Pension Plans - USD ($)
$ in Millions
 12 Months Ended
May 31, 2023
May 31, 2022
Change in plan assets:    
Fair value of plan assets at beginning of year $ 30.4  
Fair value of plan assets at end of year 19.6 $ 30.4
U.K.    
Change in plan assets:    
Fair value of plan assets at beginning of year 30.4 40.8
Actual return on plan assets (10.9) (6.2)
Employer contributions 1.1 1.6
Defined Benefit Plan, Plan Assets, Benefits Paid (0.8) (1.1)
Foreign currency translation (0.2) (4.7)
Fair value of plan assets at end of year $ 19.6 $ 30.4