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Inventories - Schedule of Inventory (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Inventory [Line Items] |  |
Total inventories | $ 4,705.1 | $ 4,640.2
Retail automotive dealership new vehicles |  |
Inventory [Line Items] |  |
Total inventories | 2,204.4 | 2,345.7
Retail automotive dealership used vehicles |  |
Inventory [Line Items] |  |
Total inventories | 1,238.5 | 1,119.2
Retail automotive parts, accessories, and other |  |
Inventory [Line Items] |  |
Total inventories | 181.0 | 167.8
Retail commercial truck dealership vehicles and parts |  |
Inventory [Line Items] |  |
Total inventories | 531.5 | 518.4
Commercial vehicle distribution vehicles, parts, and engines |  |
Inventory [Line Items] |  |
Total inventories | $ 549.7 | $ 489.1

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