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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
Dec. 31, 2014
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]    
Money market securities and other cash equivalents - Amortized Cost $ 16,377.8adp_CashEquivalentsAtAmortizedCost $ 2,773.7adp_CashEquivalentsAtAmortizedCost
Money market securities and other cash equivalents - Fair Value 16,377.8us-gaap_CashEquivalentsAtCarryingValue 2,773.7us-gaap_CashEquivalentsAtCarryingValue
Available-for-sale securities - Amortized Cost 20,080.2us-gaap_AvailableForSaleSecuritiesAmortizedCost 19,832.1us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale securities - Gross Unrealized Gains 284.8adp_AvailableforSaleSecuritiesUnrealizedGains 362.5adp_AvailableforSaleSecuritiesUnrealizedGains
Available-for-sale securities - Gross Unrealized Losses (36.8)adp_AvailableforsalesecuritiesUnrealizedLoss (38.1)adp_AvailableforsalesecuritiesUnrealizedLoss
Available-for-sale securities - Fair Value 20,328.2us-gaap_AvailableForSaleSecurities [1] 20,156.5us-gaap_AvailableForSaleSecurities [2]
Total corporate investments and funds held for clients - Amortized Cost 36,458.0adp_TotalCorporateInvestmentsAndFundsHeldForClientsAmortizedCost 22,605.8adp_TotalCorporateInvestmentsAndFundsHeldForClientsAmortizedCost
Total corporate investments and funds held for clients - Gross Unrealized Gains 284.8adp_TotalCorporateInvestmentsAndFundsHeldForClientsGrossUnrealizedGains 362.5adp_TotalCorporateInvestmentsAndFundsHeldForClientsGrossUnrealizedGains
Total corporate investments and funds held for clients - Gross Unrealized Losses (36.8)adp_TotalCorporateInvestmentsAndFundsHeldForClientsGrossUnrealizedLosses (38.1)adp_TotalCorporateInvestmentsAndFundsHeldForClientsGrossUnrealizedLosses
Total corporate investments and funds held for clients - Fair Value 36,706.0adp_TotalCorporateInvestmentsAndFundsHeldForClientsFairValue 22,930.2adp_TotalCorporateInvestmentsAndFundsHeldForClientsFairValue
Corporate Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities - Fair Value 148.2us-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 20,180.0us-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 8,842.0us-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 132.7adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
171.1adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Available-for-sale securities - Gross Unrealized Losses (16.5)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
(15.0)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Available-for-sale securities - Fair Value 8,958.2us-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 5,940.2us-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 73.8adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
107.3adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Available-for-sale securities - Gross Unrealized Losses (9.5)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
(11.7)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasuryAndGovernmentMember
Available-for-sale securities - Fair Value 6,004.5us-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 2,190.8us-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 6.3adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
6.1adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Available-for-sale securities - Gross Unrealized Losses (8.8)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
(6.9)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Available-for-sale securities - Fair Value 2,188.3us-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 968.8us-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 9.2adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
7.6adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Available-for-sale securities - Gross Unrealized Losses 0adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
(0.8)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Available-for-sale securities - Fair Value 978.0us-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 720.8us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adp_CanadianProvincialBondsMember
747.7us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adp_CanadianProvincialBondsMember
Available-for-sale securities - Gross Unrealized Gains 25.7adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adp_CanadianProvincialBondsMember
25.3adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adp_CanadianProvincialBondsMember
Available-for-sale securities - Gross Unrealized Losses (1.2)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adp_CanadianProvincialBondsMember
(2.5)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= adp_CanadianProvincialBondsMember
Available-for-sale securities - Fair Value 745.3us-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 549.2us-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 17.2adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
19.4adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Available-for-sale securities - Gross Unrealized Losses (0.4)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
(0.5)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember
Available-for-sale securities - Fair Value 566.0us-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 868.4us-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 19.9adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
25.7adp_AvailableforSaleSecuritiesUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
Available-for-sale securities - Gross Unrealized Losses (0.4)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
(0.7)adp_AvailableforsalesecuritiesUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
Available-for-sale securities - Fair Value $ 887.9us-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 $148.2 million and funds held for clients with fair values of $20,180.0 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.