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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, 2017
May 31, 2016
May 31, 2015
Restructuring Reserve [Roll Forward]      
Severance $ 14.9 $ 11.9 $ 9.6
Severance [Member]      
Restructuring Reserve [Roll Forward]      
Beginning balance 4.4 2.0  
Accruals 14.9 11.9  
Payments (12.7) (9.5)  
Ending balance 6.6 4.4 $ 2.0
Severance $ 12.9 $ 9.5