XML 51 R70.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Long-Term Debt and Commercial Paper (Senior Unsecured Notes and Credit Agreement) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 29, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |
Repayment of Senior Debt |  | $ 0.0 | $ 400.0 | $ 0.0
Letters of credit, amount outstanding |  | 39.7 |  |
Revolving Credit Facility Due 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity under revolving credit facility |  | 1,800.0 |  |
Additional borrowing capacity under accordion feature of revolving credit facility |  | 500.0 |  |
Revolving credit facilities letter of credit sublimit |  | 200.0 |  |
Additional borrowing capacity under revolving credit facility |  | 1,800.0 |  |
Borrowing capacity limited under the maximum consolidated leverage ratio |  | $ 1,400.0 |  |
Leverage ratio, minimum threshold, current credit spread |  | 2.0 |  |
Leverage ratio, maximum threshold, current credit spread |  | 3.25 |  |
Leverage ratio, minimum threshold, increase in credit spread |  | 3.25 |  |
Impact on credit spread from increase in leverage ratio |  | 0.125% |  |
Senior Notes [Member] | Senior Notes at Three Point Three Five Percent Due 2021 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage interest on debt instrument |  | 3.35% |  |
Senior Notes [Member] | Senior Notes at Three Point Five Percent Due 2024 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage interest on debt instrument |  | 3.50% |  |
Senior Notes [Member] | Senior Notes at Four Point Five Percent Due 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage interest on debt instrument |  | 4.50% |  |
Senior Notes [Member] | Senior Notes at Three Point Eight Percent Due 2027 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage interest on debt instrument |  | 3.80% |  |
Senior Notes [Member] | Senior Notes at Five Point Five Percent Due 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage interest on debt instrument |  | 5.50% |  |
Minimum [Member] | Revolving Credit Facility Due 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Commitment fee on undrawn amounts (percent) |  | 0.15% |  |
Maximum [Member] | Revolving Credit Facility Due 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Commitment fee on undrawn amounts (percent) |  | 0.25% |  |
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable interest rates (percent) |  | 1.25% |  |
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable interest rates (percent) |  | 1.625% |  |
Base Rate [Member] | Minimum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable interest rates (percent) |  | 0.25% |  |
Base Rate [Member] | Maximum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable interest rates (percent) |  | 0.625% |  |
Subsequent Event [Member] | Senior Notes [Member] | Senior Notes at Five Point Five Percent Due 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayment of Senior Debt | $ 350.0 |  |  |

X
- Definition The incremental increase (in basis points) in the credit spread on the revolver under the credit agreement if the leverage ratio is greater than a specified threshold. + References No definition available. + Details
Name: | an_CreditSpreadImpactLeverageRatioCreditAgreement
Namespace Prefix: | an_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The minimum, inclusive, leverage ratio, as defined in the credit agreement, in which the credit spread on the revolver would increase based on the pricing terms outlined in the agreement. + References No definition available. + Details
Name: | an_DebtCovenantIncreaseinLeverageRatioMinimumBenchmarkRange
Namespace Prefix: | an_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum, exclusive, leverage ratio, as defined in the credit agreement, in which the current credit spread on the revolver applies based on pricing terms outlined in the credit agreement. + References No definition available. + Details
Name: | an_DebtCovenantMaximumExclusiveRangeLeverageRatioCreditSpread
Namespace Prefix: | an_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition The minimum, inclusive, leverage ratio, as defined in the credit agreement, in which the current credit spread on the revolver applies based on pricing terms outlined in the agreement. + References No definition available. + Details
Name: | an_DebtCovenantMinimumInclusiveRangeLeverageRatioCreditSpread
Namespace Prefix: | an_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Maximum amount of increase in the revolving credit facility allowed under the accordion feature of the credit agreement, subject to credit availability and certain other conditions. + References No definition available. + Details
Name: | an_LineofCreditFacilityAdditionalBorrowingCapacity
Namespace Prefix: | an_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of current borrowing capacity under the revolving credit facility considering any current restrictions on the amount that could be borrowed and any amounts currently outstanding under the facility. + References No definition available. + Details
Name: | an_LineofCreditRestrictedBorrowingCapacity
Namespace Prefix: | an_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The maximum amount of letters of credit that can be issued under the terms of the revolving credit facilities. + References No definition available. + Details
Name: | an_RevolvingCreditFacilitiesLetterOfCreditSublimit
Namespace Prefix: | an_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash outflow for the settlement of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, as it matures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
Name: | us-gaap_MaturitiesOfSeniorDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=an_RevolvingCreditFacilityDue2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=an_SeniorNotesatThreePointThreeFivePercentDue2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=an_SeniorNotesatThreePointFivePercentDue2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=an_SeniorNotesatFourPointFivePercentDue2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=an_SeniorNotesatThreePointEightPercentDue2027Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=an_SeniorNotesatFivePointFivePercentDue2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |