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Commitments and Contingencies (Details) $ in Millions | Mar. 31, 2026 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
Purchase commitments | $ 2,226.8
Purchase commitments relating to 2026 | 67.9
Purchase commitments relating to 2027 and 2028 | 1,042.7
Purchase commitments relating to 2029 and 2031 | $ 998.1

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- Definition Unrecorded Unconditional Purchase Obligation, To Be Paid, Year One Through Two + References No definition available. + Details
Name: | adp_UnrecordedUnconditionalPurchaseObligationToBePaidYearOneThroughTwo
Namespace Prefix: | adp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unrecorded Unconditional Purchase Obligation, To Be Paid, Year Three Through Five + References No definition available. + Details
Name: | adp_UnrecordedUnconditionalPurchaseObligationToBePaidYearThreeThroughFive
Namespace Prefix: | adp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of unrecorded obligation to transfer funds in future for fixed or minimum amount or quantity of product and service at fixed or minimum price. Includes, but is not limited to, lease not yet commenced and take-or-pay and throughput contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 440 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482648/440-10-50-4 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in remainder of current fiscal year. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant