Annual report pursuant to Section 13 and 15(d)

Valuation and Qualifying Accounts (Details)

 v2.3.0.11
Valuation and Qualifying Accounts (Details) (USD $)
In Millions
12 Months Ended
May 31, 2011
May 31, 2010
May 31, 2009
Allowance for doubtful accounts [Member]
     
Valuation and Qualifying Accounts      
Balance as of beginning of year $ 1.9 $ 4.0 $ 4.1
Additions charged to expenses 1.8 2.6 2.9
Additions to other accounts 0.4    
Costs and deductions 2.0 4.7 3.0
Balance as of end of year 2.1 1.9 4.0
Reserve for client fund losses [Member]
     
Valuation and Qualifying Accounts      
Balance as of beginning of year 2.6 3.2 2.9
Additions charged to expenses 1.9 3.5 4.4
Costs and deductions 2.7 4.1 4.1
Balance as of end of year $ 1.8 $ 2.6 $ 3.2