Service Revenue (Summary of PEO Pass-Through Costs Netted in Revenue) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
May 31, 2020 |
May 31, 2019 |
May 31, 2018 |
|
| Service Revenue [Abstract] | |||
| Payroll wages and payroll taxes | $ 20,500.0 | $ 14,500.0 | $ 7,700.0 |
| State unemployment insurance (included in payroll wages and payroll taxes) | 85.7 | 82.3 | 47.5 |
| Guaranteed cost benefit plans | $ 647.0 | $ 451.8 | $ 274.2 |
| X | ||||||||||
- Definition Direct Pass Through Cost Guaranteed Cost Benefit Plans No definition available.
|
| X | ||||||||||
- Definition Direct Pass Through Cost Payroll Wages And Taxes Including Federal And State Unemployment Insurance No definition available.
|
| X | ||||||||||
- Definition Direct Pass Through Cost State Unemployment Insurance No definition available.
|
| X | ||||||||||
- References No definition available.
|