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Employee Benefit Plans (Details) - Schedule of change in benefit obligations - USD ($)
$ in Millions
 12 Months Ended
May 31, 2017
May 31, 2016
May 31, 2015
Change in benefit obligation:      
Service cost $ 0.1 $ 0.1  
Other Postretirement Benefits [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year 38.3 36.3  
Service cost 0.0 0.0 $ 0.0
Interest cost 0.9 1.4 1.3
Plan participants’ contributions 0.2 0.3  
Actuarial losses (gains) (8.2) 3.0  
Foreign currency translation 0.0 0.0  
Benefits paid, including expenses (2.4) (2.7)  
Benefit obligation at end of year 28.8 38.3 36.3
U.S. [Member] | Pension Plans [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year 125.0 130.0  
Service cost 0.0 0.0 0.0
Interest cost 3.2 4.6 5.0
Plan participants’ contributions 0.0 0.0  
Actuarial losses (gains) 9.2 1.2  
Foreign currency translation 0.0 0.0  
Benefits paid, including expenses (9.6) (10.8)  
Benefit obligation at end of year 127.8 125.0 130.0
U.K. [Member] | Pension Plans [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year 39.8 43.1  
Service cost 0.0 0.0 0.0
Interest cost 1.2 1.5 1.7
Plan participants’ contributions 0.0 0.0  
Actuarial losses (gains) 6.3 (1.5)  
Foreign currency translation (4.3) (2.3)  
Benefits paid, including expenses (1.3) (1.0)  
Benefit obligation at end of year $ 41.7 $ 39.8 $ 43.1