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Goodwill And Intangible Assets, Net (Schedule Of Finite-Lived Intangible Assets, Future Amortization Expense) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Three months ending June 30, 2015 $ 35.8us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
Twelve months ending June 30, 2016 139.8us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Twelve months ending June 30, 2017 111.1us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Twelve months ending June 30, 2018 62.1us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Twelve months ending June 30, 2019 42.7us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Twelve months ending June 30, 2020 $ 35.8adp_Finitelivedintangibleassetsamortizationexpenseyearsix