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Goodwill and Intangible Assets, Net (Intangible Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Indefinite-lived Intangible Assets by Segment [Line Items] |  |
Franchise rights - indefinite-lived | $ 861.2 | $ 876.2
AN Reportable Segment, Domestic [Member] |  |
Indefinite-lived Intangible Assets by Segment [Line Items] |  |
Franchise rights - indefinite-lived | 225.6 |
AN Reportable Segment, Import [Member] |  |
Indefinite-lived Intangible Assets by Segment [Line Items] |  |
Franchise rights - indefinite-lived | 189.6 |
AN Reportable Segment, Premium Luxury [Member] |  |
Indefinite-lived Intangible Assets by Segment [Line Items] |  |
Franchise rights - indefinite-lived | $ 446.0 |

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