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Financial Data By Segment And Geographic Area - Revenues, Significant Segment Expenses and Earnings before Income Taxes by Reportable Segments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 20,560.9 | $ 19,202.6 | $ 18,012.2
Less segment expenses: |  |  |
Total consolidated earnings before income taxes | 5,310.1 | 4,872.3 | 4,437.6
Operating Segments |  |  |
Less segment expenses: |  |  |
Total consolidated earnings before income taxes | 5,959.0 | 5,477.0 | 4,951.5
Intercompany eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | (12.6) | (11.8) | (14.6)
Operating Segments, Excluding Intersegment Elimination |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 20,573.5 | 19,214.4 | 18,026.8
Other |  |  |
Less segment expenses: |  |  |
Total consolidated earnings before income taxes | (648.9) | (604.7) | (513.9)
Employer Services | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 13,883.1 | 12,980.8 | 12,042.6
Less segment expenses: |  |  |
Selling and marketing | 2,177.1 | 2,025.0 | 1,885.3
Zero-margin benefits pass-through costs | 0.0 | 0.0 | 0.0
Worker's compensation coverage and state unemployment taxes | 0.0 | 0.0 | 0.0
Other segment expenses | 6,697.5 | 6,400.3 | 6,183.1
Total consolidated earnings before income taxes | 5,008.5 | 4,555.5 | 3,974.2
Employer Services | Intercompany eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | (12.6) | (11.8) | (14.6)
Employer Services | Operating Segments, Excluding Intersegment Elimination |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 13,883.1 | 12,980.8 | 12,042.6
PEO Services | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 6,690.4 | 6,233.6 | 5,984.2
Less segment expenses: |  |  |
Selling and marketing | 362.8 | 330.5 | 307.4
Zero-margin benefits pass-through costs | 4,289.0 | 3,975.9 | 3,800.9
Worker's compensation coverage and state unemployment taxes | 681.3 | 613.4 | 606.3
Other segment expenses | 406.8 | 392.3 | 292.3
Total consolidated earnings before income taxes | 950.5 | 921.5 | 977.3
PEO Services | Intercompany eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
PEO Services | Operating Segments, Excluding Intersegment Elimination |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 6,690.4 | 6,233.6 | 5,984.2
Revenues from external customers | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 19,371.8 | 18,177.9 | 17,198.8
Revenues from external customers | Employer Services | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 12,692.2 | 11,953.6 | 11,222.0
Revenues from external customers | PEO Services | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 6,679.6 | 6,224.3 | 5,976.8
Interest on funds held for clients |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,189.1 | 1,024.7 | 813.4
Interest on funds held for clients | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,189.1 | 1,024.7 | 813.4
Interest on funds held for clients | Employer Services | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 1,178.3 | 1,015.4 | 806.0
Interest on funds held for clients | PEO Services | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 10.8 | $ 9.3 | $ 7.4

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