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Summary of Significant Accounting Policies - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) finance_company segment brand numberOfStore state financial_institution | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Number of stores | numberOfStore | 210 |  |
Number of new vehicle brands | brand | 33 |  |
Number of states | state | 21 |  |
Debt Instrument [Line Items] |  |  |
Threshold period for interest to bear on receivables | 60 days |  |
Interest costs capitalized | $ 1.6 | $ 2.3 | $ 1.3
Accrued warranty balance | 0.5 | 0.6 |
Contract liability | 194.1 | 171.5 |
Contract liability, revenue recognized | 31.1 | 25.9 |
Contract asset | $ 8.2 | $ 8.9 |
Number of reportable segments | segment | 3 |  |
Loans receivables | Automobile loan |  |  |
Debt Instrument [Line Items] |  |  |
Loan receivables aged less than 60 days past due, percent (more than) | 95.00% |  |
Loan receivable on non-accrual status, percent (less than) | 5.00% |  |
Allowance for credit losses | $ 12.9 |  |
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_company | 7 |  |

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