Annual report pursuant to Section 13 and 15(d)

Accounts Receivable, Net of Allowance for Doubtful Accounts (Components of Accounts Receivable, Net of Allowance for Doubtful Accounts) (Details)

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Accounts Receivable, Net of Allowance for Doubtful Accounts (Components of Accounts Receivable, Net of Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Millions
May 31, 2018
May 31, 2017
Total accounts receivable, gross $ 538.4 $ 513.5
Less: Allowance for doubtful accounts 7.0 6.0
Accounts receivable, net of allowance for doubtful accounts 531.4 507.5
PEO Receivables [Member]    
Total accounts receivable, gross [1] 140.1 137.8
Purchased Receivables [Member]    
Total accounts receivable, gross [2] 267.0 257.3
Other Trade Receivables [Member]    
Total accounts receivable, gross [3] $ 131.3 $ 118.4
[1] PEO receivables are primarily client wages and related tax withholdings since the last payroll processed. Balances will vary based on timing of the last payroll processed and the end of the reporting period. In addition, balances as of May 31, 2018 include receivable balances for HROI, acquired in August 2017. Refer to Note C for further details.
[2] Purchased receivables relate to payroll funding arrangements with clients in the temporary staffing industry.
[3] Other trade receivables primarily relate to other ongoing services provided to our clients and can vary based on the timing of these services and the end of the reporting period.