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Inventories and Floor Plan Notes Payable - Components of Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Inventory [Line Items] |  |
Total inventories | $ 5,911.7 | $ 4,753.9
New vehicles |  |
Inventory [Line Items] |  |
Total inventories | 3,555.3 | 2,886.3
Used vehicles |  |
Inventory [Line Items] |  |
Total inventories | 2,085.6 | 1,637.5
Parts and accessories |  |
Inventory [Line Items] |  |
Total inventories | $ 270.8 | $ 230.1

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