3.24.0.1 html 399 531 1 true 109 0 false 9 false false R1.htm 0000001 - Document - Document and Entity Information Sheet http://www.autonation.com/role/DocumentandEntityInformation Document and Entity Information Cover 1 false false R2.htm 0000002 - Statement - Consolidated Balance Sheets Sheet http://www.autonation.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 0000003 - Statement - Consolidated Statements of Income Sheet http://www.autonation.com/role/ConsolidatedStatementsofIncome Consolidated Statements of Income Statements 3 false false R4.htm 0000004 - Statement - Consolidated Statements of Shareholders' Equity Sheet http://www.autonation.com/role/ConsolidatedStatementsofShareholdersEquity Consolidated Statements of Shareholders' Equity Statements 4 false false R5.htm 0000005 - Statement - Consolidated Statements of Cash Flows Sheet http://www.autonation.com/role/ConsolidatedStatementsofCashFlows Consolidated Statements of Cash Flows Statements 5 false false R6.htm 0000006 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.autonation.com/role/ConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) Statements 6 false false R7.htm 0000007 - Statement - Cash Flow Information Sheet http://www.autonation.com/role/CashFlowInformation Cash Flow Information Statements 7 false false R8.htm 0000008 - Disclosure - Description of Business and Summary of Significant Accounting Policies Sheet http://www.autonation.com/role/DescriptionofBusinessandSummaryofSignificantAccountingPolicies Description of Business and Summary of Significant Accounting Policies Notes 8 false false R9.htm 0000009 - Disclosure - Revenue Recognition Sheet http://www.autonation.com/role/RevenueRecognition Revenue Recognition Notes 9 false false R10.htm 0000010 - Disclosure - Earnings Per Share Sheet http://www.autonation.com/role/EarningsPerShare Earnings Per Share Notes 10 false false R11.htm 0000011 - Disclosure - Receivables, Net Sheet http://www.autonation.com/role/ReceivablesNet Receivables, Net Notes 11 false false R12.htm 0000012 - Disclosure - Auto Loans Receivable Sheet http://www.autonation.com/role/AutoLoansReceivable Auto Loans Receivable Notes 12 false false R13.htm 0000013 - Disclosure - Inventory and Vehicle Floorplan Payable Sheet http://www.autonation.com/role/InventoryandVehicleFloorplanPayable Inventory and Vehicle Floorplan Payable Notes 13 false false R14.htm 0000014 - Disclosure - Property and Equipment, Net Sheet http://www.autonation.com/role/PropertyandEquipmentNet Property and Equipment, Net Notes 14 false false R15.htm 0000015 - Disclosure - Goodwill and Intangible Assets, Net Sheet http://www.autonation.com/role/GoodwillandIntangibleAssetsNet Goodwill and Intangible Assets, Net Notes 15 false false R16.htm 0000016 - Disclosure - Leases Sheet http://www.autonation.com/role/Leases Leases Notes 16 false false R17.htm 0000017 - Disclosure - Debt Sheet http://www.autonation.com/role/Debt Debt Notes 17 false false R18.htm 0000018 - Disclosure - Chargeback Liability Sheet http://www.autonation.com/role/ChargebackLiability Chargeback Liability Notes 18 false false R19.htm 0000019 - Disclosure - Self-Insurance Sheet http://www.autonation.com/role/SelfInsurance Self-Insurance Notes 19 false false R20.htm 0000020 - Disclosure - Income Taxes Sheet http://www.autonation.com/role/IncomeTaxes Income Taxes Notes 20 false false R21.htm 0000021 - Disclosure - Shareholders' Equity Sheet http://www.autonation.com/role/ShareholdersEquity Shareholders' Equity Notes 21 false false R22.htm 0000022 - Disclosure - Stock-Based Compensation Sheet http://www.autonation.com/role/StockBasedCompensation Stock-Based Compensation Notes 22 false false R23.htm 0000023 - Disclosure - Acquisitions Sheet http://www.autonation.com/role/Acquisitions Acquisitions Notes 23 false false R24.htm 0000024 - Disclosure - Store Divestitures Sheet http://www.autonation.com/role/StoreDivestitures Store Divestitures Notes 24 false false R25.htm 0000025 - Disclosure - Financial Instruments and Fair Value Measurements Sheet http://www.autonation.com/role/FinancialInstrumentsandFairValueMeasurements Financial Instruments and Fair Value Measurements Notes 25 false false R26.htm 0000026 - Disclosure - Commitments and Contingencies Sheet http://www.autonation.com/role/CommitmentsandContingencies Commitments and Contingencies Notes 26 false false R27.htm 0000027 - Disclosure - Business and Credit Concentrations Sheet http://www.autonation.com/role/BusinessandCreditConcentrations Business and Credit Concentrations Notes 27 false false R28.htm 0000028 - Disclosure - Segment Information Sheet http://www.autonation.com/role/SegmentInformation Segment Information Notes 28 false false R29.htm 0000029 - Disclosure - Multiemployer Pension Plans Sheet http://www.autonation.com/role/MultiemployerPensionPlans Multiemployer Pension Plans Notes 29 false false R30.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 30 false false R31.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 31 false false R32.htm 9954471 - Disclosure - Description of Business and Summary of Significant Accounting Policies (Policies) Sheet http://www.autonation.com/role/DescriptionofBusinessandSummaryofSignificantAccountingPoliciesPolicies Description of Business and Summary of Significant Accounting Policies (Policies) Policies http://www.autonation.com/role/DescriptionofBusinessandSummaryofSignificantAccountingPolicies 32 false false R33.htm 9954472 - Disclosure - Revenue Recognition (Tables) Sheet http://www.autonation.com/role/RevenueRecognitionTables Revenue Recognition (Tables) Tables http://www.autonation.com/role/RevenueRecognition 33 false false R34.htm 9954473 - Disclosure - Earnings Per Share (Tables) Sheet http://www.autonation.com/role/EarningsPerShareTables Earnings Per Share (Tables) Tables http://www.autonation.com/role/EarningsPerShare 34 false false R35.htm 9954474 - Disclosure - Receivables, Net (Tables) Sheet http://www.autonation.com/role/ReceivablesNetTables Receivables, Net (Tables) Tables http://www.autonation.com/role/ReceivablesNet 35 false false R36.htm 9954475 - Disclosure - Auto Loans Receivable (Tables) Sheet http://www.autonation.com/role/AutoLoansReceivableTables Auto Loans Receivable (Tables) Tables http://www.autonation.com/role/AutoLoansReceivable 36 false false R37.htm 9954476 - Disclosure - Inventory and Vehicle Floorplan Payable (Tables) Sheet http://www.autonation.com/role/InventoryandVehicleFloorplanPayableTables Inventory and Vehicle Floorplan Payable (Tables) Tables http://www.autonation.com/role/InventoryandVehicleFloorplanPayable 37 false false R38.htm 9954477 - Disclosure - Property and Equipment, Net (Tables) Sheet http://www.autonation.com/role/PropertyandEquipmentNetTables Property and Equipment, Net (Tables) Tables http://www.autonation.com/role/PropertyandEquipmentNet 38 false false R39.htm 9954478 - Disclosure - Goodwill and Intangible Assets, Net (Tables) Sheet http://www.autonation.com/role/GoodwillandIntangibleAssetsNetTables Goodwill and Intangible Assets, Net (Tables) Tables http://www.autonation.com/role/GoodwillandIntangibleAssetsNet 39 false false R40.htm 9954479 - Disclosure - Leases (Tables) Sheet http://www.autonation.com/role/LeasesTables Leases (Tables) Tables http://www.autonation.com/role/Leases 40 false false R41.htm 9954480 - Disclosure - Debt (Tables) Sheet http://www.autonation.com/role/DebtTables Debt (Tables) Tables http://www.autonation.com/role/Debt 41 false false R42.htm 9954481 - Disclosure - Chargeback Liability (Tables) Sheet http://www.autonation.com/role/ChargebackLiabilityTables Chargeback Liability (Tables) Tables http://www.autonation.com/role/ChargebackLiability 42 false false R43.htm 9954482 - Disclosure - Self-Insurance (Tables) Sheet http://www.autonation.com/role/SelfInsuranceTables Self-Insurance (Tables) Tables http://www.autonation.com/role/SelfInsurance 43 false false R44.htm 9954483 - Disclosure - Income Taxes (Tables) Sheet http://www.autonation.com/role/IncomeTaxesTables Income Taxes (Tables) Tables http://www.autonation.com/role/IncomeTaxes 44 false false R45.htm 9954484 - Disclosure - Shareholders' Equity (Tables) Sheet http://www.autonation.com/role/ShareholdersEquityTables Shareholders' Equity (Tables) Tables http://www.autonation.com/role/ShareholdersEquity 45 false false R46.htm 9954485 - Disclosure - Stock-Based Compensation (Tables) Sheet http://www.autonation.com/role/StockBasedCompensationTables Stock-Based Compensation (Tables) Tables http://www.autonation.com/role/StockBasedCompensation 46 false false R47.htm 9954486 - Disclosure - Acquisitions (Tables) Sheet http://www.autonation.com/role/AcquisitionsTables Acquisitions (Tables) Tables http://www.autonation.com/role/Acquisitions 47 false false R48.htm 9954487 - Disclosure - Cash Flow Information (Tables) Sheet http://www.autonation.com/role/CashFlowInformationTables Cash Flow Information (Tables) Tables 48 false false R49.htm 9954488 - Disclosure - Financial Instruments and Fair Value Measurements (Tables) Sheet http://www.autonation.com/role/FinancialInstrumentsandFairValueMeasurementsTables Financial Instruments and Fair Value Measurements (Tables) Tables http://www.autonation.com/role/FinancialInstrumentsandFairValueMeasurements 49 false false R50.htm 9954489 - Disclosure - Segment Information (Tables) Sheet http://www.autonation.com/role/SegmentInformationTables Segment Information (Tables) Tables http://www.autonation.com/role/SegmentInformation 50 false false R51.htm 9954490 - Disclosure - Multiemployer Pension Plans (Tables) Sheet http://www.autonation.com/role/MultiemployerPensionPlansTables Multiemployer Pension Plans (Tables) Tables http://www.autonation.com/role/MultiemployerPensionPlans 51 false false R52.htm 9954491 - Disclosure - Description of Business and Summary of Significant Accounting Policies (Organization and Business, Inventory) (Details) Sheet http://www.autonation.com/role/DescriptionofBusinessandSummaryofSignificantAccountingPoliciesOrganizationandBusinessInventoryDetails Description of Business and Summary of Significant Accounting Policies (Organization and Business, Inventory) (Details) Details http://www.autonation.com/role/DescriptionofBusinessandSummaryofSignificantAccountingPoliciesPolicies 52 false false R53.htm 9954492 - Disclosure - Description of Business and Summary of Significant Accounting Policies (Property and Equipment Net) (Details) Sheet http://www.autonation.com/role/DescriptionofBusinessandSummaryofSignificantAccountingPoliciesPropertyandEquipmentNetDetails Description of Business and Summary of Significant Accounting Policies (Property and Equipment Net) (Details) Details http://www.autonation.com/role/DescriptionofBusinessandSummaryofSignificantAccountingPoliciesPolicies 53 false false R54.htm 9954493 - Disclosure - Description of Business and Summary of Significant Accounting Policies (Goodwill and Other Intangible Assets) (Details) Sheet http://www.autonation.com/role/DescriptionofBusinessandSummaryofSignificantAccountingPoliciesGoodwillandOtherIntangibleAssetsDetails Description of Business and Summary of Significant Accounting Policies (Goodwill and Other Intangible Assets) (Details) Details http://www.autonation.com/role/DescriptionofBusinessandSummaryofSignificantAccountingPoliciesPolicies 54 false false R55.htm 9954494 - Disclosure - Description of Business and Summary of Significant Accounting Policies (Employee Savings Plans) (Details) Sheet http://www.autonation.com/role/DescriptionofBusinessandSummaryofSignificantAccountingPoliciesEmployeeSavingsPlansDetails Description of Business and Summary of Significant Accounting Policies (Employee Savings Plans) (Details) Details http://www.autonation.com/role/DescriptionofBusinessandSummaryofSignificantAccountingPoliciesPolicies 55 false false R56.htm 9954495 - Disclosure - Description of Business and Summary of Significant Accounting Policies (Revenue Recognition, Advertising) (Details) Sheet http://www.autonation.com/role/DescriptionofBusinessandSummaryofSignificantAccountingPoliciesRevenueRecognitionAdvertisingDetails Description of Business and Summary of Significant Accounting Policies (Revenue Recognition, Advertising) (Details) Details http://www.autonation.com/role/DescriptionofBusinessandSummaryofSignificantAccountingPoliciesPolicies 56 false false R57.htm 9954496 - Disclosure - Revenue Recognition Disaggregation of Revenue (Details) Sheet http://www.autonation.com/role/RevenueRecognitionDisaggregationofRevenueDetails Revenue Recognition Disaggregation of Revenue (Details) Details 57 false false R58.htm 9954497 - Disclosure - Revenue Recognition Revenue Remaining Performance Obligation, Expected Timing of Satisfaction (Details) Sheet http://www.autonation.com/role/RevenueRecognitionRevenueRemainingPerformanceObligationExpectedTimingofSatisfactionDetails Revenue Recognition Revenue Remaining Performance Obligation, Expected Timing of Satisfaction (Details) Details 58 false false R59.htm 9954498 - Disclosure - Revenue Recognition Contract Assets and Liabilities (Details) Sheet http://www.autonation.com/role/RevenueRecognitionContractAssetsandLiabilitiesDetails Revenue Recognition Contract Assets and Liabilities (Details) Details 59 false false R60.htm 9954499 - Disclosure - Revenue Recognition Contract Costs (Details) Sheet http://www.autonation.com/role/RevenueRecognitionContractCostsDetails Revenue Recognition Contract Costs (Details) Details 60 false false R61.htm 9954500 - Disclosure - Earnings Per Share (Basic and Diluted) (Details) Sheet http://www.autonation.com/role/EarningsPerShareBasicandDilutedDetails Earnings Per Share (Basic and Diluted) (Details) Details http://www.autonation.com/role/EarningsPerShareTables 61 false false R62.htm 9954501 - Disclosure - Earnings Per Share (Anti-Dilutive Equity Instruments Excluded from the Computation of Diluted Earnings Per Share) (Details) Sheet http://www.autonation.com/role/EarningsPerShareAntiDilutiveEquityInstrumentsExcludedfromtheComputationofDilutedEarningsPerShareDetails Earnings Per Share (Anti-Dilutive Equity Instruments Excluded from the Computation of Diluted Earnings Per Share) (Details) Details http://www.autonation.com/role/EarningsPerShareTables 62 false false R63.htm 9954502 - Disclosure - Receivables, Net (Components Of Receivables, Net Of Allowances For Expected Credit Losses) (Details) Sheet http://www.autonation.com/role/ReceivablesNetComponentsOfReceivablesNetOfAllowancesForExpectedCreditLossesDetails Receivables, Net (Components Of Receivables, Net Of Allowances For Expected Credit Losses) (Details) Details http://www.autonation.com/role/ReceivablesNetTables 63 false false R64.htm 9954503 - Disclosure - Auto Loans Receivable - Components Of Receivables, Net Of Allowances For Expected Credit Losses (Details) Sheet http://www.autonation.com/role/AutoLoansReceivableComponentsOfReceivablesNetOfAllowancesForExpectedCreditLossesDetails Auto Loans Receivable - Components Of Receivables, Net Of Allowances For Expected Credit Losses (Details) Details 64 false false R65.htm 9954504 - Disclosure - Auto Loans Receivable - Financing Receivable Credit Quality Indicators (Details) Sheet http://www.autonation.com/role/AutoLoansReceivableFinancingReceivableCreditQualityIndicatorsDetails Auto Loans Receivable - Financing Receivable Credit Quality Indicators (Details) Details 65 false false R66.htm 9954505 - Disclosure - Auto Loans Receivable - Financing Receivable, Allowance for Credit Loss (Details) Sheet http://www.autonation.com/role/AutoLoansReceivableFinancingReceivableAllowanceforCreditLossDetails Auto Loans Receivable - Financing Receivable, Allowance for Credit Loss (Details) Details 66 false false R67.htm 9954506 - Disclosure - Auto Loans Receivable - Financing Receivable, Past Due (Details) Sheet http://www.autonation.com/role/AutoLoansReceivableFinancingReceivablePastDueDetails Auto Loans Receivable - Financing Receivable, Past Due (Details) Details 67 false false R68.htm 9954507 - Disclosure - Inventory and Vehicle Floorplan Payable (Components of Inventory) (Details) Sheet http://www.autonation.com/role/InventoryandVehicleFloorplanPayableComponentsofInventoryDetails Inventory and Vehicle Floorplan Payable (Components of Inventory) (Details) Details http://www.autonation.com/role/InventoryandVehicleFloorplanPayableTables 68 false false R69.htm 9954508 - Disclosure - Inventory and Vehicle Floorplan Payable (Components of Vehicle Floorplan Payable) (Details) Sheet http://www.autonation.com/role/InventoryandVehicleFloorplanPayableComponentsofVehicleFloorplanPayableDetails Inventory and Vehicle Floorplan Payable (Components of Vehicle Floorplan Payable) (Details) Details http://www.autonation.com/role/InventoryandVehicleFloorplanPayableTables 69 false false R70.htm 9954509 - Disclosure - Inventory and Vehicle Floorplan Payable (Narrative) (Details) Sheet http://www.autonation.com/role/InventoryandVehicleFloorplanPayableNarrativeDetails Inventory and Vehicle Floorplan Payable (Narrative) (Details) Details http://www.autonation.com/role/InventoryandVehicleFloorplanPayableTables 70 false false R71.htm 9954510 - Disclosure - Property and Equipment, Net (Details) Sheet http://www.autonation.com/role/PropertyandEquipmentNetDetails Property and Equipment, Net (Details) Details http://www.autonation.com/role/PropertyandEquipmentNetTables 71 false false R72.htm 9954511 - Disclosure - Goodwill and Intangible Assets, Net (Details) Sheet http://www.autonation.com/role/GoodwillandIntangibleAssetsNetDetails Goodwill and Intangible Assets, Net (Details) Details http://www.autonation.com/role/GoodwillandIntangibleAssetsNetTables 72 false false R73.htm 9954512 - Disclosure - Goodwill and Intangible Assets, Net (Goodwill) (Details) Sheet http://www.autonation.com/role/GoodwillandIntangibleAssetsNetGoodwillDetails Goodwill and Intangible Assets, Net (Goodwill) (Details) Details http://www.autonation.com/role/GoodwillandIntangibleAssetsNetTables 73 false false R74.htm 9954513 - Disclosure - Goodwill and Intangible Assets, Net (Intangible Assets) (Details) Sheet http://www.autonation.com/role/GoodwillandIntangibleAssetsNetIntangibleAssetsDetails Goodwill and Intangible Assets, Net (Intangible Assets) (Details) Details http://www.autonation.com/role/GoodwillandIntangibleAssetsNetTables 74 false false R75.htm 9954514 - Disclosure - Leases (Details) Sheet http://www.autonation.com/role/LeasesDetails Leases (Details) Details http://www.autonation.com/role/LeasesTables 75 false false R76.htm 9954515 - Disclosure - Debt (Long-Term Debt) (Details) Sheet http://www.autonation.com/role/DebtLongTermDebtDetails Debt (Long-Term Debt) (Details) Details http://www.autonation.com/role/DebtTables 76 false false R77.htm 9954516 - Disclosure - Debt (Maturities of Long-Term Debt) (Details) Sheet http://www.autonation.com/role/DebtMaturitiesofLongTermDebtDetails Debt (Maturities of Long-Term Debt) (Details) Details http://www.autonation.com/role/DebtTables 77 false false R78.htm 9954517 - Disclosure - Debt (Senior Unsecured Notes and Credit Agreement) (Details) Notes http://www.autonation.com/role/DebtSeniorUnsecuredNotesandCreditAgreementDetails Debt (Senior Unsecured Notes and Credit Agreement) (Details) Details http://www.autonation.com/role/DebtTables 78 false false R79.htm 9954518 - Disclosure - Debt (Other Long-Term Debt and Commercial Paper) (Details) Sheet http://www.autonation.com/role/DebtOtherLongTermDebtandCommercialPaperDetails Debt (Other Long-Term Debt and Commercial Paper) (Details) Details http://www.autonation.com/role/DebtTables 79 false false R80.htm 9954519 - Disclosure - Debt (Non-Recourse Debt) (Details) Sheet http://www.autonation.com/role/DebtNonRecourseDebtDetails Debt (Non-Recourse Debt) (Details) Details http://www.autonation.com/role/DebtTables 80 false false R81.htm 9954520 - Disclosure - Chargeback Liability (Details) Sheet http://www.autonation.com/role/ChargebackLiabilityDetails Chargeback Liability (Details) Details http://www.autonation.com/role/ChargebackLiabilityTables 81 false false R82.htm 9954521 - Disclosure - Self-Insurance (Details) Sheet http://www.autonation.com/role/SelfInsuranceDetails Self-Insurance (Details) Details http://www.autonation.com/role/SelfInsuranceTables 82 false false R83.htm 9954522 - Disclosure - Income Taxes Components of Income Tax Provision From Continuing Operations (Details) Sheet http://www.autonation.com/role/IncomeTaxesComponentsofIncomeTaxProvisionFromContinuingOperationsDetails Income Taxes Components of Income Tax Provision From Continuing Operations (Details) Details 83 false false R84.htm 9954523 - Disclosure - Reconciliation of Income Tax Provision (Details) Sheet http://www.autonation.com/role/ReconciliationofIncomeTaxProvisionDetails Reconciliation of Income Tax Provision (Details) Details 84 false false R85.htm 9954524 - Disclosure - Income Taxes Deferred Income Tax Asset and Liability Components (Details) Sheet http://www.autonation.com/role/IncomeTaxesDeferredIncomeTaxAssetandLiabilityComponentsDetails Income Taxes Deferred Income Tax Asset and Liability Components (Details) Details 85 false false R86.htm 9954525 - Disclosure - Income Taxes Deferred Income Tax Asset and Liability Components - Narrative (Details) Sheet http://www.autonation.com/role/IncomeTaxesDeferredIncomeTaxAssetandLiabilityComponentsNarrativeDetails Income Taxes Deferred Income Tax Asset and Liability Components - Narrative (Details) Details 86 false false R87.htm 9954526 - Disclosure - Unrecognized Tax Benefits and Tax Reform (Details) Sheet http://www.autonation.com/role/UnrecognizedTaxBenefitsandTaxReformDetails Unrecognized Tax Benefits and Tax Reform (Details) Details 87 false false R88.htm 9954527 - Disclosure - Shareholders' Equity (Shares Repurchased Under Share Repurchase Program) (Details) Sheet http://www.autonation.com/role/ShareholdersEquitySharesRepurchasedUnderShareRepurchaseProgramDetails Shareholders' Equity (Shares Repurchased Under Share Repurchase Program) (Details) Details http://www.autonation.com/role/ShareholdersEquityTables 88 false false R89.htm 9954528 - Disclosure - Shareholders' Equity (Preferred Stock) (Details) Sheet http://www.autonation.com/role/ShareholdersEquityPreferredStockDetails Shareholders' Equity (Preferred Stock) (Details) Details http://www.autonation.com/role/ShareholdersEquityTables 89 false false R90.htm 9954529 - Disclosure - Shareholders' Equity (Common Stock Issued With The Exercise Of Stock Options (Details) Sheet http://www.autonation.com/role/ShareholdersEquityCommonStockIssuedWithTheExerciseOfStockOptionsDetails Shareholders' Equity (Common Stock Issued With The Exercise Of Stock Options (Details) Details http://www.autonation.com/role/ShareholdersEquityTables 90 false false R91.htm 9954530 - Disclosure - Shareholders' Equity (Shares Issued And Shares Surrendered To Satisfy Tax Withholdings In Connection With Restricted Stock Units) (Details) Sheet http://www.autonation.com/role/ShareholdersEquitySharesIssuedAndSharesSurrenderedToSatisfyTaxWithholdingsInConnectionWithRestrictedStockUnitsDetails Shareholders' Equity (Shares Issued And Shares Surrendered To Satisfy Tax Withholdings In Connection With Restricted Stock Units) (Details) Details http://www.autonation.com/role/ShareholdersEquityTables 91 false false R92.htm 9954531 - Disclosure - Stock-Based Compensation (Details) Sheet http://www.autonation.com/role/StockBasedCompensationDetails Stock-Based Compensation (Details) Details http://www.autonation.com/role/StockBasedCompensationTables 92 false false R93.htm 9954532 - Disclosure - Stock-Based Compensation (Restricted Stock Units) (Details) Sheet http://www.autonation.com/role/StockBasedCompensationRestrictedStockUnitsDetails Stock-Based Compensation (Restricted Stock Units) (Details) Details http://www.autonation.com/role/StockBasedCompensationTables 93 false false R94.htm 9954533 - Disclosure - Stock-Based Compensation (Stock Options) (Details) Sheet http://www.autonation.com/role/StockBasedCompensationStockOptionsDetails Stock-Based Compensation (Stock Options) (Details) Details http://www.autonation.com/role/StockBasedCompensationTables 94 false false R95.htm 9954534 - Disclosure - Acquisitions (Details) Sheet http://www.autonation.com/role/AcquisitionsDetails Acquisitions (Details) Details http://www.autonation.com/role/AcquisitionsTables 95 false false R96.htm 9954535 - Disclosure - Divestitures (Details) Sheet http://www.autonation.com/role/DivestituresDetails Divestitures (Details) Details 96 false false R97.htm 9954536 - Disclosure - Cash Flow Information (Details) Sheet http://www.autonation.com/role/CashFlowInformationDetails Cash Flow Information (Details) Details http://www.autonation.com/role/CashFlowInformationTables 97 false false R98.htm 9954537 - Disclosure - Financial Instruments and Fair Value Measurements (Summary of Carrying Values and Fair Values of Fixed Rate Debt) (Details) Sheet http://www.autonation.com/role/FinancialInstrumentsandFairValueMeasurementsSummaryofCarryingValuesandFairValuesofFixedRateDebtDetails Financial Instruments and Fair Value Measurements (Summary of Carrying Values and Fair Values of Fixed Rate Debt) (Details) Details http://www.autonation.com/role/FinancialInstrumentsandFairValueMeasurementsTables 98 false false R99.htm 9954538 - Disclosure - Financial Instruments And Fair Value Measurements (Nonfinancial Assets Measured on a Nonrecurring Basis) (Details) Sheet http://www.autonation.com/role/FinancialInstrumentsAndFairValueMeasurementsNonfinancialAssetsMeasuredonaNonrecurringBasisDetails Financial Instruments And Fair Value Measurements (Nonfinancial Assets Measured on a Nonrecurring Basis) (Details) Details 99 false false R100.htm 9954539 - Disclosure - Financial Instruments and Fair Value Measurements (Narrative) (Details) Sheet http://www.autonation.com/role/FinancialInstrumentsandFairValueMeasurementsNarrativeDetails Financial Instruments and Fair Value Measurements (Narrative) (Details) Details http://www.autonation.com/role/FinancialInstrumentsandFairValueMeasurementsTables 100 false false R101.htm 9954540 - Disclosure - Commitments and Contingencies (Details) Sheet http://www.autonation.com/role/CommitmentsandContingenciesDetails Commitments and Contingencies (Details) Details http://www.autonation.com/role/CommitmentsandContingencies 101 false false R102.htm 9954541 - Disclosure - Business and Credit Concentrations (Details) Sheet http://www.autonation.com/role/BusinessandCreditConcentrationsDetails Business and Credit Concentrations (Details) Details http://www.autonation.com/role/BusinessandCreditConcentrations 102 false false R103.htm 9954542 - Disclosure - Segment Information (Details) Sheet http://www.autonation.com/role/SegmentInformationDetails Segment Information (Details) Details http://www.autonation.com/role/SegmentInformationTables 103 false false R104.htm 9954543 - Disclosure - Multiemployer Pension Plans (Details) Sheet http://www.autonation.com/role/MultiemployerPensionPlansDetails Multiemployer Pension Plans (Details) Details http://www.autonation.com/role/MultiemployerPensionPlansTables 104 false false All Reports Book All Reports an-20231231.htm an-20231231.xsd an-20231231_cal.xml an-20231231_def.xml an-20231231_lab.xml an-20231231_pre.xml an-20231231_g1.jpg an-20231231_g2.jpg http://fasb.org/us-gaap/2023 http://xbrl.sec.gov/dei/2023 http://xbrl.sec.gov/ecd/2023 true true