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Statements Of Consolidated Earnings (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
Income Statement [Abstract] |  |
Direct Pass Through Costs P E O Revenues | $ 6,865.3 | $ 5,736.2

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- Definition Direct pass-through costs associated with PEO, primarily consisting of payroll wages and payroll taxes. + References No definition available. + Details
Name: | adp_DirectPassThroughCostsPEORevenues
Namespace Prefix: | adp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_IncomeStatementAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration