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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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Publisher FASB
-Name Accounting Standards Codification
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