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Revenues - Retail Commercial Truck Dealership (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues
Total revenues	$ 20,443.9	$ 23,179.4	$ 22,785.1
Retail Commercial Truck Dealership
Revenues
Total revenues	2,060.9	2,050.5	1,374.5
New vehicle | Retail Commercial Truck Dealership
Revenues
Total revenues	1,315.9	1,347.2	866.9
Used vehicle | Retail Commercial Truck Dealership
Revenues
Total revenues	194.2	117.0	112.0
Finance and insurance, net | Retail Commercial Truck Dealership
Revenues
Total revenues	14.5	12.4	11.9
Service and parts | Retail Commercial Truck Dealership
Revenues
Total revenues	478.1	503.3	364.5
Other | Retail Commercial Truck Dealership
Revenues
Total revenues	$ 58.2	$ 70.6	$ 19.2

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