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Corporate Investments And Funds Held For Clients (Schedule Of Investment Of Funds Held For Clients) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Jun. 30, 2014
Corporate Investments And Funds Held For Clients [Abstract]    
Restricted cash and cash equivalents held to satisfy client funds obligations $ 14,527.0us-gaap_RestrictedCashAndCashEquivalents $ 1,187.8us-gaap_RestrictedCashAndCashEquivalents
Restricted short-term marketable securities held to satisfy client funds obligations 4,595.7us-gaap_AvailableforsaleSecuritiesRestrictedCurrent 1,312.5us-gaap_AvailableforsaleSecuritiesRestrictedCurrent
Restricted long-term marketable securities held to satisfy client funds obligations 15,584.3us-gaap_AvailableforsaleSecuritiesRestrictedNoncurrent 16,757.7us-gaap_AvailableforsaleSecuritiesRestrictedNoncurrent
Total funds held for clients $ 34,707.0adp_TotalFundsHeldToSatisfyClientFundObligationAtCarryingValue $ 19,258.0adp_TotalFundsHeldToSatisfyClientFundObligationAtCarryingValue