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Inventories - Schedule of Inventory (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Inventory [Line Items] |  |
Total inventories | $ 4,822.4 | $ 4,293.1
Retail automotive dealership new vehicles |  |
Inventory [Line Items] |  |
Total inventories | 2,353.0 | 1,951.3
Retail automotive dealership used vehicles |  |
Inventory [Line Items] |  |
Total inventories | 1,154.1 | 1,186.3
Retail automotive parts, accessories, and other |  |
Inventory [Line Items] |  |
Total inventories | 169.2 | 156.2
Retail commercial truck dealership vehicles and parts |  |
Inventory [Line Items] |  |
Total inventories | 596.6 | 543.7
Commercial vehicle distribution vehicles, parts, and engines |  |
Inventory [Line Items] |  |
Total inventories | $ 549.5 | $ 455.6

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