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REVENUES - Revenues Disaggregated by Revenue Source and Geographical Segments (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue
Revenues	$ 3,489.6	$ 3,412.8	$ 3,625.6	$ 2,953.9	$ 2,922.0	$ 2,985.4	$ 2,094.6	$ 2,598.2	$ 13,481.9	$ 10,600.2	$ 11,597.9
Variable consideration recognized									22.3
U.S.
Disaggregation of Revenue
Revenues									10,846.3	8,503.4	9,184.2
U.K.
Disaggregation of Revenue
Revenues									2,635.6	2,096.8	2,413.7
Total new and used vehicle sales
Disaggregation of Revenue
Revenues									11,309.3	8,779.8	9,645.3
Total new and used vehicle sales | U.S.
Disaggregation of Revenue
Revenues									8,959.9	6,924.5	7,516.6
Total new and used vehicle sales | U.K.
Disaggregation of Revenue
Revenues									2,349.4	1,855.3	2,128.7
New vehicle retail sales
Disaggregation of Revenue
Revenues									6,504.8	5,428.4	6,027.3
New vehicle retail sales | U.S.
Disaggregation of Revenue
Revenues									5,371.4	4,406.6	4,832.2
New vehicle retail sales | U.K.
Disaggregation of Revenue
Revenues									1,133.3	1,021.8	1,195.1
Used vehicle retail sales
Disaggregation of Revenue
Revenues									4,438.8	3,055.6	3,281.2
Used vehicle retail sales | U.S.
Disaggregation of Revenue
Revenues									3,356.3	2,348.5	2,509.9
Used vehicle retail sales | U.K.
Disaggregation of Revenue
Revenues									1,082.5	707.2	771.3
Used vehicle wholesale sales
Disaggregation of Revenue
Revenues									365.7	295.8	336.8
Used vehicle wholesale sales | U.S.
Disaggregation of Revenue
Revenues									232.2	169.4	174.5
Used vehicle wholesale sales | U.K.
Disaggregation of Revenue
Revenues									133.6	126.4	162.3
Parts and service sales
Disaggregation of Revenue
Revenues									1,591.2	1,357.4	1,462.4
Parts and service sales | U.S.
Disaggregation of Revenue
Revenues									1,361.4	1,162.6	1,234.4
Parts and service sales | U.K.
Disaggregation of Revenue
Revenues									229.8	194.8	227.9
Finance, insurance and other, net
Disaggregation of Revenue
Revenues									581.4	463.0	490.2
Variable consideration recognized									22.3	27.6	19.5
Finance, insurance and other, net | U.S.
Disaggregation of Revenue
Revenues									525.0	416.3	433.2
Finance, insurance and other, net | U.K.
Disaggregation of Revenue
Revenues									$ 56.4	$ 46.6	$ 57.0

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