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Earnings per Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]        
Net earnings from continuing operations $ 492.0us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 433.2us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 1,124.0us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 1,012.2us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Basic weighted average shares outstanding (shares) 470.3us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 478.9us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 475.1us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 479.1us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants 1.9us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants 2.6us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants 1.7us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants 2.9us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Effect of Employee Restricted stock Shares On Weighted Average Number of Diluted Shares Outstanding 1.8adp_EffectOfEmployeeRestrictedStockSharesOnWeightedAverageNumberOfDilutedSharesOutstanding 1.5adp_EffectOfEmployeeRestrictedStockSharesOnWeightedAverageNumberOfDilutedSharesOutstanding 1.5adp_EffectOfEmployeeRestrictedStockSharesOnWeightedAverageNumberOfDilutedSharesOutstanding 1.4adp_EffectOfEmployeeRestrictedStockSharesOnWeightedAverageNumberOfDilutedSharesOutstanding
Diluted weighted average shares outstanding (shares) 474.0us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 483.0us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 478.3us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 483.4us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Income (Loss) from Continuing Operations, Per Basic Share (usd per share) $ 1.05us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.90us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 2.37us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 2.11us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Income (Loss) from Continuing Operations, Per Diluted Share (usd per share) $ 1.04us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.90us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 2.35us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 2.09us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Options excluded from the calculation of diluted earnings per share 0.7us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1.5us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0.2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1.5us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount