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Employee Benefit Plans (Details) - Schedule of change in benefit obligations - USD ($)
$ in Millions
 12 Months Ended
May 31, 2021
May 31, 2020
May 31, 2019
Pension Plans      
Change in benefit obligation:      
Plan amendments $ 0.0 $ 0.0  
U.K. | Pension Plans      
Change in benefit obligation:      
Benefit obligation at beginning of year 41.7 40.9  
Interest cost 0.7 0.9 $ 0.9
Plan participants’ contributions 0.0 0.0  
Actuarial losses (gains) (0.3) 2.4  
Foreign currency translation 6.4 (1.1)  
Benefits paid, including expenses (1.5) (1.4)  
Benefit obligation at end of year 47.0 41.7 40.9
U.S. | Other Postretirement Benefits      
Change in benefit obligation:      
Benefit obligation at beginning of year 20.8 23.4  
Interest cost 0.3 0.6 0.8
Plan participants’ contributions 0.1 0.2  
Actuarial losses (gains) 0.3 (1.3)  
Foreign currency translation 0.0 0.0  
Plan amendments (7.6) 0.0  
Benefits paid, including expenses (1.8) (2.1)  
Benefit obligation at end of year $ 12.1 $ 20.8 $ 23.4