Service Revenue (Summary of PEO Pass-Through Costs Netted in Revenue) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Nov. 30, 2020 |
Nov. 30, 2019 |
Nov. 30, 2020 |
Nov. 30, 2019 |
|
| Service Revenue [Abstract] | ||||
| Payroll wages and payroll taxes | $ 5,100.0 | $ 5,200.0 | $ 10,000.0 | $ 10,300.0 |
| State unemployment insurance (included in payroll wages and payroll taxes) | 12.8 | 12.0 | 25.6 | 26.7 |
| Guaranteed cost benefit plans | $ 143.1 | $ 165.0 | $ 293.5 | $ 330.8 |
| X | ||||||||||
- Definition Direct Pass Through Cost Guaranteed Cost Benefit Plans No definition available.
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| X | ||||||||||
- Definition Direct Pass Through Cost Payroll Wages And Taxes Including Federal And State Unemployment Insurance No definition available.
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| X | ||||||||||
- Definition Direct Pass Through Cost State Unemployment Insurance No definition available.
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| X | ||||||||||
- References No definition available.
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