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Inventories - Schedule of Inventory (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Inventory [Line Items] |  |
Total inventories | $ 4,640.2 | $ 4,293.1
Retail automotive dealership new vehicles |  |
Inventory [Line Items] |  |
Total inventories | 2,345.7 | 1,951.3
Retail automotive dealership used vehicles |  |
Inventory [Line Items] |  |
Total inventories | 1,119.2 | 1,186.3
Retail automotive parts, accessories, and other |  |
Inventory [Line Items] |  |
Total inventories | 167.8 | 156.2
Retail commercial truck dealership vehicles and parts |  |
Inventory [Line Items] |  |
Total inventories | 518.4 | 543.7
Commercial vehicle distribution vehicles, parts, and engines |  |
Inventory [Line Items] |  |
Total inventories | $ 489.1 | $ 455.6

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