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Employee Benefit Plans (Details) - Schedule of change in benefit obligations - USD ($)
$ in Millions
 12 Months Ended
May 31, 2019
May 31, 2018
May 31, 2017
Pension Plans [Member]      
Change in benefit obligation:      
Settlement $ 0.0 $ 0.0  
Plan amendments 0.1 0.0  
Other Postretirement Benefits [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year 26.8 28.8  
Service cost 0.0 0.0 $ 0.0
Interest cost 0.8 0.8 0.9
Plan participants’ contributions 0.4 0.4  
Actuarial losses (gains) 0.1 (2.4)  
Foreign currency translation 0.0 0.0  
Settlement 0.0 0.0  
Plan amendments (2.7) 0.0  
Benefits paid, including expenses (2.0) (0.8)  
Benefit obligation at end of year 23.4 26.8 28.8
U.S. [Member] | Pension Plans [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year 0.0 127.8  
Service cost   0.0 0.0
Interest cost   1.9 3.2
Plan participants’ contributions   0.0  
Actuarial losses (gains)   1.7  
Foreign currency translation   0.0  
Settlement   (125.2)  
Plan amendments   0.0  
Benefits paid, including expenses   (6.2)  
Benefit obligation at end of year 0.0 0.0 127.8
U.K. [Member] | Pension Plans [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year 40.0 41.7  
Service cost 0.0 0.0 0.0
Interest cost 0.9 1.1 1.2
Plan participants’ contributions 0.0 0.0  
Actuarial losses (gains) 3.1 (2.0)  
Foreign currency translation (2.0) 1.3  
Benefits paid, including expenses (1.2) (2.1)  
Benefit obligation at end of year $ 40.9 $ 40.0 $ 41.7