Service Revenue (Summary of PEO Pass-Through Costs Netted in Revenue) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Feb. 28, 2021 |
Feb. 29, 2020 |
Feb. 28, 2021 |
Feb. 29, 2020 |
|
| Service Revenue [Abstract] | ||||
| Payroll wages and payroll taxes | $ 5,500.0 | $ 5,600.0 | $ 15,500.0 | $ 15,900.0 |
| State unemployment insurance (included in payroll wages and payroll taxes) | 73.1 | 47.2 | 98.7 | 73.9 |
| Guaranteed cost benefit plans | $ 146.1 | $ 159.0 | $ 439.6 | $ 489.8 |
| 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.
|