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Allowance for Doubtful Accounts (Tables)
 12 Months Ended
May 31, 2014
Allowance for Doubtful Accounts  
Schedule of allowance for doubtful accounts

  May 31,  
 
   2014   2013   2012  

Balance, beginning of year

   $ 8.7   $ 6.5   $ 5.7  

Provision charged to operations

     0.7     6.8     2.4  

Deductions for accounts written off, net of recoveries

     (3.2 )   (4.6 )   (1.6 )
               
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Balance, end of year

   $ 6.2   $ 8.7   $ 6.5  
               
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