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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, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 3,235.4 | $ 2,987.3 | $ 6,314.2 | $ 5,904.2
Earnings before Income Taxes | 565.7 | 786.2 | 1,113.9 | 1,314.8
Employer Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,437.6 | 2,309.3 | 4,754.0 | 4,570.6
Earnings before Income Taxes | 706.4 | 681.1 | 1,353.0 | 1,337.1
PEO Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 945.3 | 822.9 | 1,848.8 | 1,617.6
Earnings before Income Taxes | 128.2 | 114.5 | 245.0 | 221.6
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | (1.9) | (2.3) | (3.9) | (6.0)
Earnings before Income Taxes | (123.3) | 133.2 | (199.4) | 34.1
Client Fund Interest Reconciling Item [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | (145.6) | (142.6) | (284.7) | (278.0)
Earnings before Income Taxes | $ (145.6) | $ (142.6) | $ (284.7) | $ (278.0)

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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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