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Allowance for Doubtful Accounts
 12 Months Ended
May 31, 2014
Allowance for Doubtful Accounts  
Allowance for Doubtful Accounts

15. 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 )
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Balance, end of year

   $ 6.2   $ 8.7   $ 6.5  
               
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