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Inventories (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Inventory [Line Items] |  |
Total inventories | $ 3,700.2 | $ 3,509.1
Retail automotive dealership new vehicles |  |
Inventory [Line Items] |  |
Total inventories | 1,566.6 | 1,326.5
Retail automotive dealership used vehicles |  |
Inventory [Line Items] |  |
Total inventories | 1,114.7 | 1,279.6
Retail automotive parts, accessories, and other |  |
Inventory [Line Items] |  |
Total inventories | 153.3 | 145.6
Retail commercial truck dealership vehicles and parts |  |
Inventory [Line Items] |  |
Total inventories | 494.3 | 506.2
Commercial vehicle distribution vehicles, parts, and engines |  |
Inventory [Line Items] |  |
Total inventories | $ 371.3 | $ 251.2

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