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REVENUES - Revenues Disaggregated by Revenue Source and Geographical Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue
Revenues	$ 17,873.7	$ 16,222.1	$ 13,481.9
Variable consideration recognized	24.1
U.S.
Disaggregation of Revenue
Revenues	14,814.2	13,427.1	10,846.3
U.K.
Disaggregation of Revenue
Revenues	3,059.5	2,795.1	2,635.6
Total new and used vehicle sales
Disaggregation of Revenue
Revenues	14,909.5	13,490.4	11,309.3
Total new and used vehicle sales | U.S.
Disaggregation of Revenue
Revenues	12,206.6	11,008.8	8,959.9
Total new and used vehicle sales | U.K.
Disaggregation of Revenue
Revenues	2,702.9	2,481.6	2,349.4
New vehicle retail sales
Disaggregation of Revenue
Revenues	8,774.6	7,452.5	6,504.8
New vehicle retail sales | U.S.
Disaggregation of Revenue
Revenues	7,433.6	6,238.5	5,371.4
New vehicle retail sales | U.K.
Disaggregation of Revenue
Revenues	1,341.0	1,214.0	1,133.3
Used vehicle retail sales
Disaggregation of Revenue
Revenues	5,693.5	5,673.3	4,438.8
Used vehicle retail sales | U.S.
Disaggregation of Revenue
Revenues	4,458.7	4,531.5	3,356.3
Used vehicle retail sales | U.K.
Disaggregation of Revenue
Revenues	1,234.8	1,141.8	1,082.5
Used vehicle wholesale sales
Disaggregation of Revenue
Revenues	441.4	364.6	365.7
Used vehicle wholesale sales | U.S.
Disaggregation of Revenue
Revenues	314.4	238.8	232.2
Used vehicle wholesale sales | U.K.
Disaggregation of Revenue
Revenues	127.1	125.8	133.6
Parts and service sales
Disaggregation of Revenue
Revenues	2,222.3	2,009.5	1,591.2
Parts and service sales | U.S.
Disaggregation of Revenue
Revenues	1,933.3	1,761.4	1,361.4
Parts and service sales | U.K.
Disaggregation of Revenue
Revenues	289.0	248.2	229.8
Finance, insurance and other, net
Disaggregation of Revenue
Revenues	741.9	722.2	581.4
Variable consideration recognized	24.1	30.8	22.3
Finance, insurance and other, net | U.S.
Disaggregation of Revenue
Revenues	674.3	656.9	525.0
Finance, insurance and other, net | U.K.
Disaggregation of Revenue
Revenues	$ 67.6	$ 65.2	$ 56.4

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