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Financial Data By Segment And Geographic Area - Financial Data By Segment And Geographic Area - Depreciation and Amortization Included in Earnings before Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |
Total depreciation and amortization | $ 582.4 | $ 561.9 | $ 549.3
Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total depreciation and amortization | 63.3 | 68.5 | 74.2
Employer Services | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total depreciation and amortization | 512.4 | 486.6 | 467.6
PEO Services | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Total depreciation and amortization | $ 6.7 | $ 6.8 | $ 7.5

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