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REVENUES - Revenues Disaggregated by Revenue Source and Geographical Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue
Revenues	$ 19,934.3	$ 17,873.7	$ 16,222.1
Variable consideration recognized	30.6
U.S.
Disaggregation of Revenue
Revenues	15,772.9	14,814.2	13,427.1
U.K.
Disaggregation of Revenue
Revenues	4,161.5	3,059.5	2,795.1
Total new and used vehicle sales
Disaggregation of Revenue
Revenues	16,614.7	14,909.5	13,490.4
Total new and used vehicle sales | U.S.
Disaggregation of Revenue
Revenues	12,984.6	12,206.6	11,008.8
Total new and used vehicle sales | U.K.
Disaggregation of Revenue
Revenues	3,630.1	2,702.9	2,481.6
New vehicle retail sales
Disaggregation of Revenue
Revenues	9,972.4	8,774.6	7,452.5
New vehicle retail sales | U.S.
Disaggregation of Revenue
Revenues	8,110.1	7,433.6	6,238.5
New vehicle retail sales | U.K.
Disaggregation of Revenue
Revenues	1,862.3	1,341.0	1,214.0
Used vehicle retail sales
Disaggregation of Revenue
Revenues	6,179.9	5,693.5	5,673.3
Used vehicle retail sales | U.S.
Disaggregation of Revenue
Revenues	4,550.7	4,458.7	4,531.5
Used vehicle retail sales | U.K.
Disaggregation of Revenue
Revenues	1,629.2	1,234.8	1,141.8
Used vehicle wholesale sales
Disaggregation of Revenue
Revenues	462.4	441.4	364.6
Used vehicle wholesale sales | U.S.
Disaggregation of Revenue
Revenues	323.8	314.4	238.8
Used vehicle wholesale sales | U.K.
Disaggregation of Revenue
Revenues	138.6	127.1	125.8
Parts and service sales
Disaggregation of Revenue
Revenues	2,491.0	2,222.3	2,009.5
Parts and service sales | U.S.
Disaggregation of Revenue
Revenues	2,052.7	1,933.3	1,761.4
Parts and service sales | U.K.
Disaggregation of Revenue
Revenues	438.3	289.0	248.2
Finance, insurance and other, net
Disaggregation of Revenue
Revenues	828.7	741.9	722.2
Variable consideration recognized	30.6	24.1	30.8
Finance, insurance and other, net | U.S.
Disaggregation of Revenue
Revenues	735.6	674.3	656.9
Finance, insurance and other, net | U.K.
Disaggregation of Revenue
Revenues	$ 93.0	$ 67.6	$ 65.2

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