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Other Accrued Expenses - Schedule of Accrued Severance (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2019
May 31, 2018
May 31, 2017
Restructuring Reserve [Roll Forward]      
Severance $ 10.6 $ 9.9 $ 14.9
Severance [Member]      
Restructuring Reserve [Roll Forward]      
Beginning balance 4.2 6.6  
Accruals 10.6 9.9  
Payments (9.3) (12.3)  
Ending balance 5.5 4.2 $ 6.6
Cost Reduction Programs [Member]      
Restructuring Reserve [Roll Forward]      
Severance $ 6.5 $ 7.4