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ACQUISITIONS AND DIVESTITURES - Pro Forma Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Franchise rights
Business Acquisition [Line Items]
Goodwill and intangible asset impairment	$ 117.2
Jim Koons Dealerships
Business Acquisition [Line Items]
Pro forma revenue	17,540.4	$ 18,516.1
Pro forma net income	$ 660.8	$ 1,092.9

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
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-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

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-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
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-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

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