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Revenues - Retail Commercial Truck Dealership (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues
Total revenues	$ 6,497.3	$ 5,971.6	$ 19,258.6	$ 14,631.8
Retail commercial truck dealership
Revenues
Total revenues	717.3	590.9	1,777.3	1,481.5
New vehicle | Retail commercial truck dealership
Revenues
Total revenues	464.1	376.6	1,110.8	930.4
Used vehicle | Retail commercial truck dealership
Revenues
Total revenues	81.2	63.9	191.2	135.4
Finance and insurance, net | Retail commercial truck dealership
Revenues
Total revenues	4.8	4.1	11.7	10.5
Service and parts | Retail commercial truck dealership
Revenues
Total revenues	160.9	122.1	442.8	358.1
Other | Retail commercial truck dealership
Revenues
Total revenues	$ 6.3	$ 24.2	$ 20.8	$ 47.1

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