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Divestiture Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gain on sale of business | $ 29.1 |  |
Common stock, par value (usd per share) | $ 0.10 |  | $ 0.10
Dividend received from Disposal Entity | $ 0.0 | $ 825.0 |
Gain (Loss) from Disposal Entity | $ (1.4) | 0.0 | $ 100.9
Separation Costs, Incurred Cost |  | $ 42.8 |
AdvancedMD [Domain] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Disposal Date | Sep. 01, 2015 |  |
Procure-to-Pay Solutions [Domain] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Disposal Date | Jun. 26, 2015 |  |
Dealer [Domain] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Disposal Date |  |  | Sep. 30, 2014
CDK Global Inc [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
ADP shares to be converted to Disposal Entity's Shares |  | 1.0 |
Common stock, par value (usd per share) |  | $ 0.01 |
Disposal Entity's shares converted from Parent shares |  | 3.0 |
Shares Distributed of Disposal Entity's common stock |  | 160,600,000 |
Unvested Shares Distributed | 1,000,000 |  |
Date of record for ADP stockholders to receive CDK shares |  | Sep. 24, 2014 |

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