Annual report pursuant to Section 13 and 15(d)

Valuation and Qualifying Accounts (Details)

v2.4.0.8
Valuation and Qualifying Accounts (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
Allowance for Doubtful Accounts [Member]
     
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance as of beginning of fiscal year $ 1.2 $ 2.1 $ 1.9
Additions charged to expenses 1.7 1.2 1.8
(Deductions from)/ additions to other accounts 0 0 0.4
Costs and deductions 1.9 2.1 2.0
Balance as of end of fiscal year 1.0 1.2 2.1
Reserve For Client Fund Losses [Member]
     
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance as of beginning of fiscal year 2.1 3.1 2.6
Additions charged to expenses 2.7 2.3 1.9
(Deductions from)/ additions to other accounts 0 (0.7) 1.3
Costs and deductions 2.4 2.6 2.7
Balance as of end of fiscal year $ 2.4 $ 2.1 $ 3.1