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Summary of Significant Accounting Policies - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) store brand | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Number of stores | store | 459 |  |
Number of new vehicle brands | brand | 52 |  |
Debt Instrument [Line Items] |  |  |
Threshold period for interest to bear on receivables (in days) | 60 days |  |
Interest costs capitalized | $ 5.4 | $ 2.6 | $ 2.6
Restricted cash | $ 43.6 | 30.6 | $ 24.8
Customer returns on sales, threshold period past due (in days) | 30 days |  |
Contract liability | $ 368.3 | 317.0 |
Contract liability, revenue recognized | 59.9 | 55.2 |
Contract asset | $ 7.3 | $ 11.8 |
Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Period that contracts in transit are outstanding (in days) | 5 days |  |
Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Period that contracts in transit are outstanding (in days) | 10 days |  |

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