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Accrued Severance (Tables)
 12 Months Ended
May 31, 2017
Restructuring and Related Activities [Abstract]  
Schedule of accrued severance costs
The table below provides information regarding Accrued severance, which is included in “Other accrued expenses” on the Company’s Consolidated Balance Sheets. 
 
2017
 
2016
Beginning balance
$
4.4

 
$
2.0

Accruals
14.9

 
11.9

Payments
(12.7
)
 
(9.5
)
Ending balance
$
6.6

 
$
4.4