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Credit Facilities and Long-term Debt - Narrative (Details) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 09, 2019 USD ($) | Jul. 24, 2017 USD ($) | Dec. 31, 2019 USD ($) financial_institution finance_companies | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |
Floor plan notes payable |  |  | $ 425,200,000 | $ 324,400,000
Total long-term debt outstanding |  |  | $ 1,480,300,000 | 1,390,100,000
Floor Plan Notes Payable | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  |  | 6.25% |
Line of Credit | Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total financing commitment | $ 2,800,000,000 |  |  |
Number of financial institutions | financial_institution |  |  | 19 |
Number of manufacturer affiliated finance companies | finance_companies |  |  | 7 |
Higher borrowing capacity option | $ 3,200,000,000 |  |  |
Other debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt outstanding |  |  | $ 33,600,000 | 34,200,000
Real Estate Mortgages |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percent of total mortgage debt that is fixed |  |  | 72.50% |
Total long-term debt outstanding |  |  | $ 597,700,000 | 592,300,000
Real Estate Mortgages | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  |  | 3.00% |
Real Estate Mortgages | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  |  | 5.30% |
Capital Lease Obligations | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  |  | 2.50% |
Capital Lease Obligations | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  |  | 8.50% |
Senior Notes | 5.250% Senior notes due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage |  | 5.25% | 5.25% |
Aggregate principal amount |  | $ 300,000,000.0 |  |
Total long-term debt outstanding |  |  | $ 300,000,000.0 | 300,000,000.0
Redemption percentage price |  | 100.00% |  |
Percentage of principal amount redeemable |  | 101.00% |  |
Senior Notes | 4.625% Senior notes due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate, stated percentage | 4.625% |  | 4.625% |
Aggregate principal amount | $ 400,000,000.0 |  |  |
Total long-term debt outstanding |  |  | $ 400,000,000.0 | 0
Percentage of principal amount redeemable | 101.00% |  |  |
Senior Notes | Option One | 4.625% Senior notes due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption percentage price | 100.00% |  |  |
Senior Notes | Option Two | 4.625% Senior notes due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption percentage price | 40.00% |  |  |
Used Vehicle Inventory Financing Facility | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Annual interest rate (in percent) |  |  | 3.18% |
Total long-term debt outstanding |  |  | $ 149,000,000.0 | 332,000,000.0
Used Vehicle Inventory Financing Facility | Line of Credit | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate (in percent) |  |  | 1.40% |
Used Vehicle Inventory Financing Facility | Line of Credit | Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Option to reallocate commitment, maximum aggregate commitment threshold percentage | 16.50% |  |  |
Revolving Lines of Credit | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Annual interest rate (in percent) |  |  | 3.28% |
Total long-term debt outstanding |  |  | $ 0 | $ 131,600,000
Revolving Lines of Credit | Line of Credit | LIBOR | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate (in percent) |  |  | 1.00% |
Revolving Lines of Credit | Line of Credit | LIBOR | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate (in percent) |  |  | 2.00% |
Revolving Lines of Credit | Line of Credit | Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Option to reallocate commitment, maximum aggregate commitment threshold percentage | 18.75% |  |  |
Service Loaner Floor Plan | Line of Credit | Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total financing commitment | $ 100,000,000 |  |  |
New Vehicle Floor Plan | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Annual interest rate (in percent) |  |  | 2.88% |
New Vehicle Floor Plan | Line of Credit | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate (in percent) |  |  | 1.10% |
New Vehicle Floor Plan | Line of Credit | Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Accordion feature, increase limit | $ 400,000,000 |  |  |
Other Lines of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total financing commitment |  |  | $ 80,000,000.0 |
Long-term line of credit |  |  | $ 0 |
Other Lines of Credit | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Annual interest rate (in percent) |  |  | 7.33% |
Ford Motor Credit Company | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total financing commitment |  |  | $ 20,000,000.0 |
Ford Motor Credit Company | Secured Debt | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate (in percent) |  |  | 1.50% |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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