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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current:      
Federal $ 220.9us-gaap_CurrentFederalTaxExpenseBenefit $ 189.7us-gaap_CurrentFederalTaxExpenseBenefit $ 146.9us-gaap_CurrentFederalTaxExpenseBenefit
State 32.2us-gaap_CurrentStateAndLocalTaxExpenseBenefit 28.9us-gaap_CurrentStateAndLocalTaxExpenseBenefit 25.1us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Federal and state deferred 9.5us-gaap_DeferredIncomeTaxExpenseBenefit 13.4us-gaap_DeferredIncomeTaxExpenseBenefit 27.1us-gaap_DeferredIncomeTaxExpenseBenefit
Change in valuation allowance, net 0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (3.7)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 0.1us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Adjustments and settlements (0.1)an_IncomeTaxReconciliationTaxSettlementsAndAdjustments 0.3an_IncomeTaxReconciliationTaxSettlementsAndAdjustments 0.3an_IncomeTaxReconciliationTaxSettlementsAndAdjustments
Income tax provision 262.5us-gaap_IncomeTaxExpenseBenefit 228.6us-gaap_IncomeTaxExpenseBenefit 199.5us-gaap_IncomeTaxExpenseBenefit
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Income tax provision at statutory rate 238.8us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 211.6us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 180.9us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Non-deductible expenses (income), net 1.3us-gaap_IncomeTaxReconciliationNondeductibleExpense (0.6)us-gaap_IncomeTaxReconciliationNondeductibleExpense (0.2)us-gaap_IncomeTaxReconciliationNondeductibleExpense
State income taxes, net of federal benefit 23.2us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 21.7us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 18.8us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Income tax provision, excluding other reconciling items 263.3an_IncomeTaxExpenseBenefitContinuingOperationsExcludingOtherReconcilingItems 232.7an_IncomeTaxExpenseBenefitContinuingOperationsExcludingOtherReconcilingItems 199.5an_IncomeTaxExpenseBenefitContinuingOperationsExcludingOtherReconcilingItems
Change in valuation allowance, net 0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (3.7)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 0.1us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Adjustments and settlements (0.1)an_IncomeTaxReconciliationTaxSettlementsAndAdjustments 0.3an_IncomeTaxReconciliationTaxSettlementsAndAdjustments 0.3an_IncomeTaxReconciliationTaxSettlementsAndAdjustments
Other, net (0.7)us-gaap_IncomeTaxReconciliationOtherAdjustments (0.7)us-gaap_IncomeTaxReconciliationOtherAdjustments (0.4)us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax provision 262.5us-gaap_IncomeTaxExpenseBenefit 228.6us-gaap_IncomeTaxExpenseBenefit 199.5us-gaap_IncomeTaxExpenseBenefit
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Income tax provision at statutory rate, % 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Non-deductible expenses (income), net, % 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
State income taxes, net of federal benefit, % 3.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Income tax provision, excluding other reconciling items, % 38.60%an_EffectiveIncomeTaxRateReconciliationContinuingOperationsExcludingOtherReconcilingItems 38.50%an_EffectiveIncomeTaxRateReconciliationContinuingOperationsExcludingOtherReconcilingItems 38.60%an_EffectiveIncomeTaxRateReconciliationContinuingOperationsExcludingOtherReconcilingItems
Change in valuation allowance, net, % 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (0.60%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Adjustments and settlements, % 0.00%an_EffectiveIncomeTaxRateReconciliationTaxSettlementsAndAdjustments 0.00%an_EffectiveIncomeTaxRateReconciliationTaxSettlementsAndAdjustments 0.10%an_EffectiveIncomeTaxRateReconciliationTaxSettlementsAndAdjustments
Other, net, % (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Income tax provision, % 38.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 37.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations 38.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Deferred income tax assets:      
Inventory 28.9us-gaap_DeferredTaxAssetsInventory 24.6us-gaap_DeferredTaxAssetsInventory  
Receivable reserves 3.0an_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccountsAndProvisionForLoanLosses 3.0an_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccountsAndProvisionForLoanLosses  
Warranty, chargeback and self - insurance liabilities 57.8an_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantySelfInsuranceAndChargebacks 49.2an_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantySelfInsuranceAndChargebacks  
Other accrued liabilities 25.1us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 21.6us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities  
Deferred compensation 24.0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther 19.7us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsOther  
Stock-based compensation 26.8us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 24.1us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost  
Loss carryforwards—federal and state 7.2us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 10.5us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Other, net 13.2us-gaap_DeferredTaxAssetsOther 12.7us-gaap_DeferredTaxAssetsOther  
Total deferred income tax assets 186.0us-gaap_DeferredTaxAssetsGross 165.4us-gaap_DeferredTaxAssetsGross  
Valuation allowance (2.5)us-gaap_DeferredTaxAssetsValuationAllowance (2.7)us-gaap_DeferredTaxAssetsValuationAllowance  
Deferred income tax assets, net of valuation allowance 183.5us-gaap_DeferredTaxAssetsNet 162.7us-gaap_DeferredTaxAssetsNet  
Deferred income tax liabilities:      
Long-lived assets (intangibles assets and property) (233.6)an_DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndIntangibleAssets (200.2)an_DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndIntangibleAssets  
Other, net (19.2)us-gaap_DeferredTaxLiabilitiesOther (21.3)us-gaap_DeferredTaxLiabilitiesOther  
Total deferred income tax liabilities (252.8)us-gaap_DeferredIncomeTaxLiabilities (221.5)us-gaap_DeferredIncomeTaxLiabilities  
Net deferred income tax assets (liabilities) (69.3)us-gaap_DeferredTaxAssetsLiabilitiesNet (58.8)us-gaap_DeferredTaxAssetsLiabilitiesNet  
Deferred Tax Assets, Net, Classification [Abstract]      
Deferred tax assets, net, current 68.6us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 57.7us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent  
Deferred tax liabilities, net, noncurrent 137.9us-gaap_DeferredTaxLiabilitiesNoncurrent 116.5us-gaap_DeferredTaxLiabilitiesNoncurrent  
Income taxes payable included in other current liabilities 17.5us-gaap_AccruedIncomeTaxesCurrent 8.4us-gaap_AccruedIncomeTaxesCurrent  
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]      
Gross domestic state net operating and capital loss carryforwards 129.5us-gaap_OperatingLossCarryforwards    
State tax credits 4.3us-gaap_TaxCreditCarryforwardAmount    
Valuation allowance related to loss carryforwards 2.5us-gaap_DeferredTaxAssetsValuationAllowance 2.7us-gaap_DeferredTaxAssetsValuationAllowance  
Gross domestic state net operating loss carryforwards and capital loss carryforwards 8.2an_DeferredTaxAssetsOperatingLossCarryforwardsAndCapitalLossCarryforwards    
Release of valuation allowance   $ 3.4us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount