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Long-Term Debt (Long-Term Debt) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Long-term debt $ 2,055.7us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities $ 2,128.4us-gaap_LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities
Less: current maturities (25.2)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent (25.0)us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Long-term debt, net of current maturities 2,030.5us-gaap_LongTermDebtAndCapitalLeaseObligations 2,103.4us-gaap_LongTermDebtAndCapitalLeaseObligations
6.75% Senior Notes Due 2018 [Member]    
Senior notes 397.3us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= an_SeniorNotesatSixPointSevenFivePercentdue2018Member
397.1us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= an_SeniorNotesatSixPointSevenFivePercentdue2018Member
5.5% Senior Notes Due 2020 [Member]    
Senior notes 350.0us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= an_SeniorNotesatFivePointFivePercentDue2020Member
350.0us-gaap_SeniorNotes
/ us-gaap_DebtInstrumentAxis
= an_SeniorNotesatFivePointFivePercentDue2020Member
Revolving Credit Facility Due 2019 [Member]    
Revolving credit facility 1,035.0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= an_RevolvingCreditFacilityDue2019Member
1,110.0us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= an_RevolvingCreditFacilityDue2019Member
Mortgage Facility [Member]    
Mortgage facility 183.1us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= an_MortgageFacilityMember
[1] 185.5us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= an_MortgageFacilityMember
[1]
Capital Leases and Other Debt [Member]    
Capital leases and other debt 90.3us-gaap_CapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= an_CapitalLeasesAndOtherDebtMember
85.8us-gaap_CapitalLeaseObligations
/ us-gaap_DebtInstrumentAxis
= an_CapitalLeasesAndOtherDebtMember
Secured Debt [Member] | Mortgage Facility [Member]    
Monthly principal and interest payments on mortgage facility 1.7us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= an_MortgageFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
 
Balloon payment for mortgage $ 155.4us-gaap_DebtInstrumentPeriodicPaymentTermsBalloonPaymentToBePaid
/ us-gaap_DebtInstrumentAxis
= an_MortgageFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
 
[1] The mortgage facility requires monthly principal and interest payments of $1.7 million based on a fixed amortization schedule with a balloon payment of $155.4 million due November 2017.