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Interim Financial Data by Segment - Financial Data By Strategic Business Unit Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 5,048.4 | $ 4,668.0 | $ 9,881.1 | $ 9,180.3
Earnings before Income Taxes | 1,261.3 | 1,143.8 | 2,497.5 | 2,236.6
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | (3.4) | (3.3) | (6.2) | (7.0)
Earnings before Income Taxes | (173.4) | (173.1) | (327.1) | (311.7)
Employer Services | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 3,388.5 | 3,125.2 | 6,649.5 | 6,171.6
Earnings before Income Taxes | 1,183.0 | 1,061.9 | 2,347.3 | 2,070.4
PEO Services | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,663.3 | 1,546.1 | 3,237.8 | 3,015.7
Earnings before Income Taxes | $ 251.7 | $ 255.0 | $ 477.3 | $ 477.9

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