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Inventories (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Inventory [Line Items] |  |
Total inventories | $ 4,293.1 | $ 3,509.1
Retail automotive dealership new vehicles |  |
Inventory [Line Items] |  |
Total inventories | 1,951.3 | 1,326.5
Retail automotive dealership used vehicles |  |
Inventory [Line Items] |  |
Total inventories | 1,186.3 | 1,279.6
Retail automotive parts, accessories, and other |  |
Inventory [Line Items] |  |
Total inventories | 156.2 | 145.6
Retail commercial truck dealership vehicles and parts |  |
Inventory [Line Items] |  |
Total inventories | 543.7 | 506.2
Commercial vehicle distribution vehicles, parts, and engines |  |
Inventory [Line Items] |  |
Total inventories | $ 455.6 | $ 251.2

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