Annual report pursuant to Section 13 and 15(d)

Valuation and Qualifying Accounts (Details)

v3.7.0.1
Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2017
May 31, 2016
May 31, 2015
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance as of beginning of fiscal year $ 4.2 $ 1.4 $ 1.5
Additions charged to expenses 4.9 2.5 1.6
Additions to/(deductions from) other accounts [1] 2.0 0.1
Costs and deductions [2] 3.1 1.7 1.8
Balance as of end of fiscal year 6.0 4.2 1.4
Reserve for Client Fund Losses [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance as of beginning of fiscal year 2.0 1.8 1.9
Additions charged to expenses 4.1 2.4 2.0
Additions to/(deductions from) other accounts [1] (0.2)
Costs and deductions [2] 3.1 2.2 1.9
Balance as of end of fiscal year $ 3.0 $ 2.0 $ 1.8
[1] Amounts related to business acquisitions.
[2] Uncollectible amounts written off, net of recoveries.