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Inventory and Vehicle Floorplan Payable (Components of Inventory) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Inventory [Line Items] |  |
Inventory | $ 3,033.4 | $ 2,048.3
New Vehicle [Member] |  |
Inventory [Line Items] |  |
Inventory | 1,948.6 | 1,009.7
Used Vehicle [Member] |  |
Inventory [Line Items] |  |
Inventory | 815.3 | 789.1
Parts and Service [Member] |  |
Inventory [Line Items] |  |
Inventory | $ 269.5 | $ 249.5

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