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Commitments And Contingencies Decrease in Future Minimum Lease Obligations (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Decrease in operating leases due to disposal:  
2015 $ 32.0adp_OperatingLeasesFutureMinimumPaymentsRemainderOfFiscalYearDecreaseDuetoDisposal
2016 22.1adp_OperatingLeasesFutureMinimumPaymentsDueInTwoYearsDecreaseDuetoDisposal
2017 12.7adp_OperatingLeasesFutureMinimumPaymentsDueInThreeYearsDecreaseDuetoDisposal
2018 5.2adp_OperatingLeasesFutureMinimumPaymentsDueInFourYearsDecreaseDuetoDisposal
2019 3.8adp_OperatingLeasesFutureMinimumPaymentsDueInFiveYearsDecreaseDuetoDisposal
Thereafter 5.6adp_OperatingLeasesFutureMinimumPaymentsDueThereafterDecreaseDuetoDisposal
Total 81.4adp_OperatingLeasesFutureMinimumPaymentsDecreaseDuetoDisposal
Decrease in purchase obligations due to disposal  
Current Year 2.9adp_UnrecordedUnconditionalPurchaseObligationDecreaseCurrent
Next Fiscal Year 4.1adp_UnrecordedUnconditionalPurchaseObligationDecreaseYearTwo
After Two Years 2.4adp_UnrecordedUnconditionalPurchaseObligationDecreaseaftertwoyears
Incremental Increase in Purchase Obligation due within Four years 43.1adp_IncrementalIncreaseinPurchaseObligationduewithinFouryears
Incremental Increase in Purchase Obligation due within Five years $ 87.3adp_IncrementalIncreaseinPurchaseObligationduewithinFiveyears