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Accrued Severance (Tables)
 12 Months Ended
May. 31, 2015
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. 
 
2015
 
2014
Beginning balance
$
1.2

 
$
3.3

Accruals
9.6

 
10.5

Payments
(8.8
)
 
(12.6
)
Ending balance
$
2.0

 
$
1.2