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REVENUES - Schedule of Revenues Disaggregated by Revenue Source and Geographical Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disaggregation of Revenue        
Total revenues $ 4,705.1 $ 4,163.4 $ 13,393.7 $ 12,153.1
U.S.        
Disaggregation of Revenue        
Total revenues 3,899.7 3,484.3 11,041.7 10,012.8
U.K.        
Disaggregation of Revenue        
Total revenues 805.5 679.1 2,352.0 2,140.3
Total new and used vehicle sales        
Disaggregation of Revenue        
Total revenues 3,938.8 3,461.5 11,161.6 10,112.5
Total new and used vehicle sales | U.S.        
Disaggregation of Revenue        
Total revenues 3,223.8 2,860.3 9,080.0 8,207.0
Total new and used vehicle sales | U.K.        
Disaggregation of Revenue        
Total revenues 715.0 601.2 2,081.7 1,905.5
New vehicle retail sales        
Disaggregation of Revenue        
Total revenues 2,264.5 1,883.3 6,463.4 5,479.8
New vehicle retail sales | U.S.        
Disaggregation of Revenue        
Total revenues 1,920.2 1,586.9 5,444.3 4,581.8
New vehicle retail sales | U.K.        
Disaggregation of Revenue        
Total revenues 344.4 296.4 1,019.1 898.0
Used vehicle retail sales        
Disaggregation of Revenue        
Total revenues 1,559.6 1,488.6 4,359.0 4,353.9
Used vehicle retail sales | U.S.        
Disaggregation of Revenue        
Total revenues 1,223.5 1,212.1 3,393.5 3,447.6
Used vehicle retail sales | U.K.        
Disaggregation of Revenue        
Total revenues 336.1 276.5 965.6 906.3
Used vehicle wholesale sales        
Disaggregation of Revenue        
Total revenues 114.7 89.6 339.2 278.9
Used vehicle wholesale sales | U.S.        
Disaggregation of Revenue        
Total revenues 80.1 61.3 242.2 177.6
Used vehicle wholesale sales | U.K.        
Disaggregation of Revenue        
Total revenues 34.6 28.3 96.9 101.2
Parts and service sales        
Disaggregation of Revenue        
Total revenues 566.9 515.6 1,677.3 1,491.1
Parts and service sales | U.S.        
Disaggregation of Revenue        
Total revenues 494.4 453.8 1,459.4 1,307.7
Parts and service sales | U.K.        
Disaggregation of Revenue        
Total revenues 72.5 61.8 217.9 183.4
Finance, insurance and other, net        
Disaggregation of Revenue        
Total revenues 199.4 186.3 554.8 549.5
Variable consideration recognized relating to performance obligations satisfied in previous period 7.2 5.3 19.7 22.2
Finance, insurance and other, net | U.S.        
Disaggregation of Revenue        
Total revenues 181.5 170.2 502.3 498.1
Finance, insurance and other, net | U.K.        
Disaggregation of Revenue        
Total revenues $ 17.9 $ 16.1 $ 52.5 $ 51.4