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Employee Benefit Plans (Details) - Schedule of change in benefit obligations - USD ($)
$ in Millions
 12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Change in benefit obligation:      
Settlement   $ (4.3)  
Pension Plans [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 173.1 180.5  
Service cost 0.0 0.0 $ 0.0
Interest cost 6.1 6.7 7.2
Plan participants’ contributions 0.0 0.0  
Actuarial losses (gains) (0.4) 11.4  
Foreign currency translation (2.3) (3.6)  
Settlement 0.0 (14.4)  
Curtailment due to sale of segment 0.0 0.1  
Benefits paid, including expenses (11.7) (7.6)  
Benefit obligation at end of year 164.8 173.1 180.5
Other Postretirement Benefits [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year 36.3 33.4  
Service cost 0.0 0.0 0.0
Interest cost 1.4 1.3 1.3
Plan participants’ contributions 0.3 0.3  
Actuarial losses (gains) 3.0 3.8  
Foreign currency translation 0.0 0.0  
Settlement 0.0 0.0  
Curtailment due to sale of segment 0.0 0.0  
Benefits paid, including expenses (2.7) (2.5)  
Benefit obligation at end of year $ 38.3 $ 36.3 $ 33.4