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Employee Benefit Plans (Details) - Schedule of change in benefit obligations - USD ($)
$ in Millions
 12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Change in benefit obligation:      
Settlement $ (4.3) $ (1.7)  
Pension Plans [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year 180.5 185.6  
Service cost 0.0 0.0 $ 0.0
Interest cost 6.7 7.2 6.9
Plan participants’ contributions 0.0 0.0  
Actuarial losses (gains) 11.4 (2.5)  
Foreign currency translation (3.6) 3.7  
Settlement (14.4) (6.4)  
Curtailment due to sale of segment 0.1 0.0  
Benefits paid, including expenses (7.6) (7.1)  
Benefit obligation at end of year 173.1 180.5 185.6
Other Postretirement Benefits [Member]      
Change in benefit obligation:      
Benefit obligation at beginning of year 33.4 36.2  
Service cost 0.0 0.0 0.0
Interest cost 1.3 1.3 1.4
Plan participants’ contributions 0.3 0.4  
Actuarial losses (gains) 3.8 (1.9)  
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 (2.5) (2.6)  
Benefit obligation at end of year $ 36.3 $ 33.4 $ 36.2