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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, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 3,695.7 | $ 3,669.5 | $ 7,166.5 | $ 7,165.2
Earnings before Income Taxes | 832.6 | 835.5 | 1,597.8 | 1,574.6
Employer Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,510.6 | 2,537.5 | 4,887.4 | 4,978.9
Earnings before Income Taxes | 758.6 | 766.3 | 1,447.8 | 1,445.7
PEO Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 1,186.1 | 1,134.7 | 2,282.0 | 2,191.5
Earnings before Income Taxes | 187.4 | 168.0 | 346.8 | 317.3
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | (1.0) | (2.7) | (2.9) | (5.2)
Earnings before Income Taxes | $ (113.4) | $ (98.8) | $ (196.8) | $ (188.4)

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