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Revenues - Retail Automotive 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
U.S.
Revenues
Total revenues	12,105.1	13,511.8	12,607.8
Retail Automotive Dealership
Revenues
Total revenues	17,928.8	20,615.8	20,849.2
Retail Automotive Dealership | U.S.
Revenues
Total revenues	10,270.3	11,697.6	11,504.3
Retail Automotive Dealership | UK
Revenues
Total revenues	6,344.1	7,559.4	7,961.4
Retail Automotive Dealership | Germany and Italy
Revenues
Total revenues	1,314.4	1,358.8	1,383.5
New vehicle | Retail Automotive Dealership
Revenues
Total revenues	8,080.5	9,329.5	9,666.4
Used vehicle | Retail Automotive Dealership
Revenues
Total revenues	6,414.7	7,241.2	7,252.1
Finance and insurance, net | Retail Automotive Dealership
Revenues
Total revenues	576.3	652.1	629.6
Service and parts | Retail Automotive Dealership
Revenues
Total revenues	1,883.7	2,195.9	2,151.4
Fleet and wholesale | Retail Automotive Dealership
Revenues
Total revenues	$ 973.6	$ 1,197.1	$ 1,149.7

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