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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

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- Definition Direct Pass Through Cost Guaranteed Cost Benefit Plans + References No definition available. + Details
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- Definition Direct Pass Through Cost Payroll Wages And Taxes Including Federal And State Unemployment Insurance + References No definition available. + Details
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- Definition Direct Pass Through Cost State Unemployment Insurance + References No definition available. + Details
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Balance Type: | debit
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- References No definition available. + Details
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