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Service Revenue (Summary of PEO Pass-Through Costs Netted in Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2021 | Nov. 30, 2020 | Nov. 30, 2021 | Nov. 30, 2020
Service Revenue [Abstract] |  |  |  |
Payroll wages and payroll taxes | $ 5,806.1 | $ 5,092.3 | $ 11,363.3 | $ 9,960.8
State unemployment insurance (included in payroll wages and payroll taxes) | 18.6 | 12.8 | 34.0 | 25.6
Guaranteed cost benefit plans | $ 156.7 | $ 143.1 | $ 307.6 | $ 293.5

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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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