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Goodwill And Intangible Assets, Net (Components Of Finite-Lived Intangible Assets) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Jun. 30, 2014
Finite-Lived Intangible Assets [Line Items]    
Total - gross $ 2,429.6us-gaap_FiniteLivedIntangibleAssetsGross $ 2,380.2us-gaap_FiniteLivedIntangibleAssetsGross
Total - accumulated amortization (1,930.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (1,881.4)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible assets, net 499.3us-gaap_IntangibleAssetsNetExcludingGoodwill 498.8us-gaap_IntangibleAssetsNetExcludingGoodwill
Software And Software Licenses [Member]    
Finite-Lived Intangible Assets [Line Items]    
Total - gross 1,582.3us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
1,523.2us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Total - accumulated amortization (1,267.6)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
(1,231.2)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Customer Contracts And Lists [Member]    
Finite-Lived Intangible Assets [Line Items]    
Total - gross 638.3us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
648.7us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
Total - accumulated amortization (473.8)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
(467.1)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerListsMember
Other Intangibles [Member]    
Finite-Lived Intangible Assets [Line Items]    
Total - gross 209.0us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= adp_OtherIntangiblesMember
208.3us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= adp_OtherIntangiblesMember
Total - accumulated amortization $ (188.9)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= adp_OtherIntangiblesMember
$ (183.1)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= adp_OtherIntangiblesMember