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Inventory And Vehicle Floorplan Payable (Components Of Inventory) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Inventory [Line Items] |  |
Inventory | $ 1,698.3 | $ 1,847.9
New Vehicle [Member] |  |
Inventory [Line Items] |  |
Inventory | 469.5 | 515.1
Used Vehicle [Member] |  |
Inventory [Line Items] |  |
Inventory | 1,001.5 | 1,109.3
Parts and Service [Member] |  |
Inventory [Line Items] |  |
Inventory | $ 227.3 | $ 223.5

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