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INVENTORIES AND FLOOR PLAN NOTES PAYABLE - Schedule of Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Inventory [Line Items] |  |
Total inventories | $ 3,855.6 | $ 3,409.4
New vehicles |  |
Inventory [Line Items] |  |
Total inventories | 2,139.7 | 1,679.8
Used vehicles |  |
Inventory [Line Items] |  |
Total inventories | 1,502.2 | 1,529.3
Parts and accessories |  |
Inventory [Line Items] |  |
Total inventories | $ 213.7 | $ 200.3

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
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