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 9 Months Ended
Feb. 28, 2022
Feb. 28, 2021
Feb. 28, 2022
Feb. 28, 2021
Service Revenue [Abstract]        
Payroll wages and payroll taxes $ 6,546.1 $ 5,518.5 $ 17,909.4 $ 15,479.3
State unemployment insurance (included in payroll wages and payroll taxes) 74.2 73.1 108.2 98.7
Guaranteed cost benefit plans $ 164.3 $ 146.1 $ 471.9 $ 439.6