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Corporate Investments And Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]    
Money market securities and other cash equivalents - Amortized Cost $ 10,025.7adp_CashEquivalentsAtAmortizedCost $ 2,773.7adp_CashEquivalentsAtAmortizedCost
Money market securities and other cash equivalents - Fair Value 10,025.7us-gaap_CashEquivalentsAtCarryingValue 2,773.7us-gaap_CashEquivalentsAtCarryingValue
Available-for-sale securities - Amortized Cost 20,165.2us-gaap_AvailableForSaleSecuritiesAmortizedCost 19,832.1us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale securities - Gross Unrealized Gains 385.2adp_AvailableforSaleSecuritiesUnrealizedGains 362.5adp_AvailableforSaleSecuritiesUnrealizedGains
Available-for-sale securities - Gross Unrealized Losses (8.9)adp_AvailableforsalesecuritiesUnrealizedLoss (38.1)adp_AvailableforsalesecuritiesUnrealizedLoss
Available-for-sale securities - Fair Value 20,541.5us-gaap_AvailableForSaleSecurities [1] 20,156.5us-gaap_AvailableForSaleSecurities [2]
Total corporate investments and funds held for clients - Amortized Cost 30,190.9adp_TotalCorporateInvestmentsAndFundsHeldForClientsAmortizedCost 22,605.8adp_TotalCorporateInvestmentsAndFundsHeldForClientsAmortizedCost
Total corporate investments and funds held for clients - Gross Unrealized Gains 385.2adp_TotalCorporateInvestmentsAndFundsHeldForClientsGrossUnrealizedGains 362.5adp_TotalCorporateInvestmentsAndFundsHeldForClientsGrossUnrealizedGains
Total corporate investments and funds held for clients - Gross Unrealized Losses (8.9)adp_TotalCorporateInvestmentsAndFundsHeldForClientsGrossUnrealizedLosses (38.1)adp_TotalCorporateInvestmentsAndFundsHeldForClientsGrossUnrealizedLosses
Total corporate investments and funds held for clients - Fair Value 30,567.2adp_TotalCorporateInvestmentsAndFundsHeldForClientsFairValue 22,930.2adp_TotalCorporateInvestmentsAndFundsHeldForClientsFairValue
Corporate Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Value 56.1us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentSecondaryCategorizationAxis
= adp_CorporateInvestmentsMember
2,086.3us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentSecondaryCategorizationAxis
= adp_CorporateInvestmentsMember
Funds Held For Clients [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Value 20,485.4us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentSecondaryCategorizationAxis
= adp_FundsHeldForClientsMember
18,070.2us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentSecondaryCategorizationAxis
= adp_FundsHeldForClientsMember
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 8,975.7us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
8,720.1us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Available-for-sale securities - Gross Unrealized Gains 184.8adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
171.1adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Available-for-sale securities - Gross Unrealized Losses (2.6)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
(15.0)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Available-for-sale securities - Fair Value 9,157.9us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
[1] 8,876.2us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
[2]
US Treasury and Government [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 5,853.7us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
6,051.4us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Available-for-sale securities - Gross Unrealized Gains 90.7adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
107.3adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Available-for-sale securities - Gross Unrealized Losses (2.8)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
(11.7)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Available-for-sale securities - Fair Value 5,941.6us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
[1] 6,147.0us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
[2]
Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 2,307.5us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
1,822.6us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Available-for-sale securities - Gross Unrealized Gains 18.2adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
6.1adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Available-for-sale securities - Gross Unrealized Losses (2.8)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
(6.9)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Available-for-sale securities - Fair Value 2,322.9us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
[1] 1,821.8us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
[2]
Canadian Government Obligations And Canadian Government Agency Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 966.1us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
1,031.4us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Available-for-sale securities - Gross Unrealized Gains 17.8adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
7.6adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Available-for-sale securities - Gross Unrealized Losses (0.1)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
(0.8)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Available-for-sale securities - Fair Value 983.8us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
[1] 1,038.2us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
[2]
Canadian Provincial Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 724.8us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adp_CanadianProvincialBondsMember
747.7us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adp_CanadianProvincialBondsMember
Available-for-sale securities - Gross Unrealized Gains 33.8adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adp_CanadianProvincialBondsMember
25.3adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adp_CanadianProvincialBondsMember
Available-for-sale securities - Gross Unrealized Losses (0.1)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adp_CanadianProvincialBondsMember
(2.5)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adp_CanadianProvincialBondsMember
Available-for-sale securities - Fair Value 758.5us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adp_CanadianProvincialBondsMember
[1] 770.5us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adp_CanadianProvincialBondsMember
[2]
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 574.3us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
543.3us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Available-for-sale securities - Gross Unrealized Gains 18.5adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
19.4adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Available-for-sale securities - Gross Unrealized Losses (0.3)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
(0.5)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Available-for-sale securities - Fair Value 592.5us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
[1] 562.2us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
[2]
Other Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Amortized Cost 763.1us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
915.6us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
Available-for-sale securities - Gross Unrealized Gains 21.4adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
25.7adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
Available-for-sale securities - Gross Unrealized Losses (0.2)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
(0.7)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
Available-for-sale securities - Fair Value $ 784.3us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
[1] $ 940.6us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
[2]
[1] Included within available-for-sale securities are corporate investments with fair values of $56.1 million and funds held for clients with fair values of $20,485.4 million. All available-for-sale securities were included in Level 2.
[2] Included within available-for-sale securities are corporate investments with fair values of $2,086.3 million and funds held for clients with fair values of $18,070.2 million. All available-for-sale securities were included in Level 2.