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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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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://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
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-URI https://asc.fasb.org/1943274/2147481372/852-10-55-10

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
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