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Revenues - Retail Automotive Dealership (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenues
Total revenues	$ 6,497.3	$ 5,971.6	$ 19,258.6	$ 14,631.8
Retail automotive dealership
Revenues
Total revenues	5,634.9	5,258.0	17,039.4	12,828.1	$ 17,900.0
Retail automotive dealership | U.S.
Revenues
Total revenues	3,271.2	2,780.7	9,890.5	7,288.4
Retail automotive dealership | UK
Revenues
Total revenues	2,055.2	2,105.5	6,099.2	4,608.7
Retail automotive dealership | Germany and Italy
Revenues
Total revenues	308.5	371.8	1,049.7	931.0
New vehicle | Retail automotive dealership
Revenues
Total revenues	2,275.2	2,350.6	7,507.9	5,599.8
Used vehicle | Retail automotive dealership
Revenues
Total revenues	2,302.3	1,954.1	6,437.9	4,739.8
Finance and insurance, net | Retail automotive dealership
Revenues
Total revenues	202.7	174.4	583.8	415.8
Service and parts | Retail automotive dealership
Revenues
Total revenues	555.3	521.8	1,604.7	1,380.3
Fleet and wholesale | Retail automotive dealership
Revenues
Total revenues	$ 299.4	$ 257.1	$ 905.1	$ 692.4

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