Quarterly report pursuant to Section 13 or 15(d)

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

v3.22.2.2
Service Revenue (Summary of PEO Pass-Through Costs Netted in Revenue) (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2022
Aug. 31, 2021
Revenue from Contract with Customer [Abstract]    
Payroll wages and payroll taxes $ 6,337.8 $ 5,557.2
State unemployment insurance (included in payroll wages and payroll taxes) 9.5 15.4
Guaranteed cost benefit plans $ 156.7 $ 150.9