XML 53 R41.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Corporate Investments and Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Money market securities and other cash equivalents - Amortized Cost | $ 13,859.8 |  | $ 8,181.6 |  |
Money market securities and other cash equivalents - Gross Unrealized Gains | 0.0 |  | 0.0 |  |
Money market securities and other cash equivalents - Gross Unrealized Losses | 0.0 |  | 0.0 |  |
Money market securities and other cash equivalents - Fair Market Value | 13,859.8 |  | 8,181.6 |  | $ 11,721.5
Available-for-sale securities - Amortized Cost | 22,432.2 |  | 21,798.6 |  |
Available-for-sale securities - Gross Unrealized Gains | 94.5 |  | 176.3 |  |
Available-for-sale securities - Gross Unrealized Losses | (151.2) |  | (73.8) |  |
Available-for-sale securities - Fair Market Value | 22,375.5 | [1] | 21,901.1 | [2] |
Total corporate investments and funds held for clients - Amortized Cost | 36,292.0 |  | 29,980.2 |  |
Total corporate investments and funds held for clients - Gross Unrealized Gains | 94.5 |  | 176.3 |  |
Total corporate investments and funds held for clients - Gross Unrealized Losses | (151.2) |  | (73.8) |  |
Total corporate investments and funds held for clients - Fair Market Value | 36,235.3 |  | 30,082.7 |  |
Corporate Investments |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities - Fair Market Value | 10.6 |  | 10.8 |  |
Funds Held For Clients |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities - Fair Market Value | 22,364.9 |  | 21,890.3 |  |
Corporate bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities - Amortized Cost | 9,435.9 |  | 9,325.3 |  |
Available-for-sale securities - Gross Unrealized Gains | 57.7 |  | 98.8 |  |
Available-for-sale securities - Gross Unrealized Losses | (39.7) |  | (22.0) |  |
Available-for-sale securities - Fair Market Value | 9,453.9 |  | 9,402.1 |  |
Asset-backed securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities - Amortized Cost | 4,445.0 |  | 4,453.1 |  |
Available-for-sale securities - Gross Unrealized Gains | 4.7 |  | 16.9 |  |
Available-for-sale securities - Gross Unrealized Losses | (22.0) |  | (8.6) |  |
Available-for-sale securities - Fair Market Value | 4,427.7 |  | 4,461.4 |  |
U.S. government agency securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities - Amortized Cost | 2,913.6 |  | 3,557.7 |  |
Available-for-sale securities - Gross Unrealized Gains | 10.6 |  | 22.2 |  |
Available-for-sale securities - Gross Unrealized Losses | (22.8) |  | (13.4) |  |
Available-for-sale securities - Fair Market Value | 2,901.4 |  | 3,566.5 |  |
U.S. Treasury securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities - Amortized Cost | 2,481.4 |  | 1,585.9 |  |
Available-for-sale securities - Gross Unrealized Gains | 1.0 |  | 2.6 |  |
Available-for-sale securities - Gross Unrealized Losses | (38.6) |  | (14.3) |  |
Available-for-sale securities - Fair Market Value | 2,443.8 |  | 1,574.2 |  |
Canadian government obligations and Canadian government agency obligations |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities - Amortized Cost | 1,148.3 |  | 1,053.6 |  |
Available-for-sale securities - Gross Unrealized Gains | 0.9 |  | 2.9 |  |
Available-for-sale securities - Gross Unrealized Losses | (20.1) |  | (11.4) |  |
Available-for-sale securities - Fair Market Value | 1,129.1 |  | 1,045.1 |  |
Canadian provincial bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities - Amortized Cost | 760.8 |  | 746.9 |  |
Available-for-sale securities - Gross Unrealized Gains | 8.3 |  | 14.3 |  |
Available-for-sale securities - Gross Unrealized Losses | (3.3) |  | (1.4) |  |
Available-for-sale securities - Fair Market Value | 765.8 |  | 759.8 |  |
Municipal bonds |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities - Amortized Cost | 586.0 |  | 582.5 |  |
Available-for-sale securities - Gross Unrealized Gains | 6.3 |  | 11.3 |  |
Available-for-sale securities - Gross Unrealized Losses | (2.0) |  | (1.3) |  |
Available-for-sale securities - Fair Market Value | 590.3 |  | 592.5 |  |
Other securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities - Amortized Cost | 661.2 |  | 493.6 |  |
Available-for-sale securities - Gross Unrealized Gains | 5.0 |  | 7.3 |  |
Available-for-sale securities - Gross Unrealized Losses | (2.7) |  | (1.4) |  |
Available-for-sale securities - Fair Market Value | $ 663.5 |  | $ 499.5 |  |
[1] | Included within available-for-sale securities are corporate investments with fair values of $10.6 million and funds held for clients with fair values of $22,364.9 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.
[2] | Included within available-for-sale securities are corporate investments with fair values of $10.8 million and funds held for clients with fair values of $21,890.3 million. All available-for-sale securities were included in Level 2 of the fair value hierarchy.

X
- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as availble-for-sale securities + References No definition available. + Details
Name: | adp_AvailableforSaleSecuritiesUnrealizedGains
Namespace Prefix: | adp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities + References No definition available. + Details
Name: | adp_AvailableforsalesecuritiesUnrealizedLoss
Namespace Prefix: | adp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Money market securities and other cash equivalents - amortized cost + References No definition available. + Details
Name: | adp_CashEquivalentsAtAmortizedCost
Namespace Prefix: | adp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Money market securities and other cash equivalents - Unrealized Gains + References No definition available. + Details
Name: | adp_CashEquivalentsAtGrossUnrealizedGains
Namespace Prefix: | adp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Money market securities and other cash equivalents - Gross Unrealized Losses + References No definition available. + Details
Name: | adp_CashEquivalentsAtGrossUnrealizedLosses
Namespace Prefix: | adp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Total corporate investments and funds held for clients - amortized cost + References No definition available. + Details
Name: | adp_TotalCorporateInvestmentsAndFundsHeldForClientsAmortizedCost
Namespace Prefix: | adp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Total corporate investments and funds held for clients - fair value + References No definition available. + Details
Name: | adp_TotalCorporateInvestmentsAndFundsHeldForClientsFairValue
Namespace Prefix: | adp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Total corporate investments and funds held for clients - gross unrealized gains + References No definition available. + Details
Name: | adp_TotalCorporateInvestmentsAndFundsHeldForClientsGrossUnrealizedGains
Namespace Prefix: | adp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total corporate investments and funds held for clients - gross unrealized losses + References No definition available. + Details
Name: | adp_TotalCorporateInvestmentsAndFundsHeldForClientsGrossUnrealizedLosses
Namespace Prefix: | adp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
Name: | us-gaap_AvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
Name: | us-gaap_CashEquivalentsAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentSecondaryCategorizationAxis=adp_CorporateInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentSecondaryCategorizationAxis=adp_FundsHeldForClientsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=adp_CanadianProvincialBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_MunicipalBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_OtherDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |