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Accrued Severance (Details) - Schedule of accrued severance cost associated with cost reduction measures - USD ($)
$ in Millions
12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Restructuring Reserve [Roll Forward]      
Severance $ 11.9 $ 9.6 $ 10.5
Severance [Member]      
Restructuring Reserve [Roll Forward]      
Beginning balance 2.0 1.2  
Accruals 11.9 9.6  
Payments (9.5) (8.8)  
Ending balance 4.4 2.0 $ 1.2
Severance $ 9.5 $ 8.9