Annual report pursuant to Section 13 and 15(d)

Valuation and Qualifying Accounts (Details)

v3.5.0.2
Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2016
May 31, 2015
May 31, 2014
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance as of beginning of fiscal year $ 1.4 $ 1.5 $ 1.0
Additions charged to expenses 2.5 1.6 2.5
Additions to/(Deductions from) other accounts [1] 2.0 0.1
Costs and deductions [2] 1.7 1.8 2.0
Balance as of end of fiscal year 4.2 1.4 1.5
Reserve for Client Fund Losses [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance as of beginning of fiscal year 1.8 1.9 2.4
Additions charged to expenses 2.4 2.0 2.2
Additions to/(Deductions from) other accounts [1] (0.2)
Costs and deductions [2] 2.2 1.9 2.7
Balance as of end of fiscal year $ 2.0 $ 1.8 $ 1.9
[1] Amounts related to business acquisitions.
[2] Uncollectible amounts written off, net of recoveries.