Revenues - Retail Commercial Truck Dealership (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues
Total revenues	$ 7,590.8	$ 7,447.8	$ 22,735.3	$ 22,255.3
Retail commercial truck dealership
Revenues
Total revenues	1,063.3	964.7	2,747.4	2,779.5
New truck \| Retail commercial truck dealership
Revenues
Total revenues	755.3	644.4	1,864.9	1,861.0
Used truck \| Retail commercial truck dealership
Revenues
Total revenues	60.1	68.4	171.2	170.3
Finance and insurance, net \| Retail commercial truck dealership
Revenues
Total revenues	5.2	5.9	14.7	15.9
Service and parts \| Retail commercial truck dealership
Revenues
Total revenues	232.8	235.1	675.6	695.2
Other \| Retail commercial truck dealership
Revenues
Total revenues	$ 9.9	$ 10.9	$ 21.0	$ 37.1

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details