Quarterly report pursuant to Section 13 or 15(d)

Service Revenue (Summary of PEO Pass-Through Costs Netted in Revenue) (Details)

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Service Revenue (Summary of PEO Pass-Through Costs Netted in Revenue) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Nov. 30, 2021
Nov. 30, 2020
Service Revenue [Abstract]        
Payroll wages and payroll taxes $ 5,806.1 $ 5,092.3 $ 11,363.3 $ 9,960.8
State unemployment insurance (included in payroll wages and payroll taxes) 18.6 12.8 34.0 25.6
Guaranteed cost benefit plans $ 156.7 $ 143.1 $ 307.6 $ 293.5