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Service Revenue (Summary of PEO Pass-Through Costs Netted in Revenue) (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2024
Aug. 31, 2023
Revenue from Contract with Customer [Abstract]    
Payroll wages and payroll taxes $ 6,881.6 $ 6,414.6
State unemployment insurance (included in payroll wages and payroll taxes) 23.0 18.6
Guaranteed cost benefit plans $ 165.8 $ 162.5