Revenues - Retail Commercial Truck Dealership (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues
Total revenues	$ 27,814.8	$ 25,554.7	$ 20,443.9
Retail commercial truck dealership
Revenues
Total revenues	3,541.3	2,465.7	2,060.9
New vehicle | Retail commercial truck dealership
Revenues
Total revenues	2,308.7	1,540.1	1,315.9
Used vehicle | Retail commercial truck dealership
Revenues
Total revenues	301.3	270.6	194.2
Finance and insurance, net | Retail commercial truck dealership
Revenues
Total revenues	20.5	16.8	14.5
Service and parts | Retail commercial truck dealership
Revenues
Total revenues	852.2	609.0	478.1
Other | Retail commercial truck dealership
Revenues
Total revenues	$ 58.6	$ 29.2	$ 58.2