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Revenues - Retail Commercial Truck Dealership (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenues
Total revenues	$ 7,695.3	$ 7,590.8	$ 22,962.1	$ 22,735.3
Retail commercial truck dealership
Revenues
Total revenues	918.6	1,063.3	2,685.9	2,747.4
New truck | Retail commercial truck dealership
Revenues
Total revenues	620.8	755.3	1,803.6	1,864.9
Used truck | Retail commercial truck dealership
Revenues
Total revenues	60.7	60.1	177.2	171.2
Finance and insurance, net | Retail commercial truck dealership
Revenues
Total revenues	3.7	5.2	12.2	14.7
Service and parts | Retail commercial truck dealership
Revenues
Total revenues	227.0	232.8	675.7	675.6
Other | Retail commercial truck dealership
Revenues
Total revenues	$ 6.4	$ 9.9	$ 17.2	$ 21.0

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