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, 2014
May 31, 2013
May 31, 2012
Allowance for Doubtful Accounts [Member]
     
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance as of beginning of fiscal year $ 1.0 $ 1.2 $ 2.1
Additions charged to expenses 2.5 1.7 1.2
(Deductions from)/ additions to other accounts 0 0 0
Costs and deductions 2.0 1.9 2.1
Balance as of end of fiscal year 1.5 1.0 1.2
Reserve For Client Fund Losses [Member]
     
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance as of beginning of fiscal year 2.4 2.1 3.1
Additions charged to expenses 2.2 2.7 2.3
(Deductions from)/ additions to other accounts 0 0 (0.7)
Costs and deductions 2.7 2.4 2.6
Balance as of end of fiscal year $ 1.9 $ 2.4 $ 2.1