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INVENTORIES AND FLOOR PLAN NOTES PAYABLE - Schedule of Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Inventory [Line Items]
Total inventories	$ 5,749.0	$ 5,911.7
New vehicles
Inventory [Line Items]
Total inventories	3,325.2	3,555.3
Used vehicles
Inventory [Line Items]
Total inventories	2,155.4	2,085.6
Parts and accessories
Inventory [Line Items]
Total inventories	$ 268.4	$ 270.8

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

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483467/210-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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