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Inventories and Floor Plan Notes Payable - Components of Inventories (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Inventory [Line Items]
Total inventories	$ 4,753.9	$ 3,409.4
New vehicles
Inventory [Line Items]
Total inventories	2,886.3	1,679.8
Used vehicles
Inventory [Line Items]
Total inventories	1,637.5	1,529.3
Parts and accessories
Inventory [Line Items]
Total inventories	$ 230.1	$ 200.3

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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.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
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-Topic 210
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