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v3.19.3.a.u2

Summary of Significant Accounting Policies - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) financial_institution state segment store brand finance_companies | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Number of stores | store | 187 |  |
Number of new vehicle brands | brand | 30 |  |
Number of states | state | 19 |  |
Debt Instrument [Line Items] |  |  |
Threshold period for interest to bear on receivables | 60 days |  |
Interest costs capitalized | $ 2.3 | $ 1.3 | $ 0.5
Accrued warranty balance | 0.6 | 0.5 |
Contract liability | 171.5 | 149.6 |
Contract liability, revenue recognized | 25.9 | 21.9 |
Contract asset | $ 8.9 | $ 9.2 |
Number of reportable segments | segment | 3 |  |
Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Period that contracts in transit are outstanding | 5 days |  |
Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Period that contracts in transit are outstanding | 10 days |  |
Credit Facility | Line of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Number of financial institutions | financial_institution | 19 |  |
Number of manufacturer affiliated finance companies | finance_companies | 7 |  |

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