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REVENUES - Revenues Disaggregated by Revenue Source and Geographical Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue        
Total revenues $ 4,163.4 $ 3,412.8 $ 12,153.1 $ 9,992.3
U.S.        
Disaggregation of Revenue        
Total revenues 3,484.3 2,662.4 10,012.8 7,991.6
U.K.        
Disaggregation of Revenue        
Total revenues 679.1 750.4 2,140.3 2,000.7
Total new and used vehicle sales        
Disaggregation of Revenue        
Total revenues 3,461.5 2,850.3 10,112.5 8,408.9
Total new and used vehicle sales | U.S.        
Disaggregation of Revenue        
Total revenues 2,860.3 2,178.8 8,207.0 6,620.2
Total new and used vehicle sales | U.K.        
Disaggregation of Revenue        
Total revenues 601.2 671.5 1,905.5 1,788.7
New vehicle retail sales        
Disaggregation of Revenue        
Total revenues 1,883.3 1,513.9 5,479.8 4,828.6
New vehicle retail sales | U.S.        
Disaggregation of Revenue        
Total revenues 1,586.9 1,208.5 4,581.8 3,958.9
New vehicle retail sales | U.K.        
Disaggregation of Revenue        
Total revenues 296.4 305.4 898.0 869.7
Used vehicle retail sales        
Disaggregation of Revenue        
Total revenues 1,488.6 1,230.4 4,353.9 3,302.3
Used vehicle retail sales | U.S.        
Disaggregation of Revenue        
Total revenues 1,212.1 902.3 3,447.6 2,481.7
Used vehicle retail sales | U.K.        
Disaggregation of Revenue        
Total revenues 276.5 328.0 906.3 820.5
Used vehicle wholesale sales        
Disaggregation of Revenue        
Total revenues 89.6 106.0 278.9 278.0
Used vehicle wholesale sales | U.S.        
Disaggregation of Revenue        
Total revenues 61.3 68.0 177.6 179.6
Used vehicle wholesale sales | U.K.        
Disaggregation of Revenue        
Total revenues 28.3 38.1 101.2 98.4
Parts and service sales        
Disaggregation of Revenue        
Total revenues 515.6 416.5 1,491.1 1,152.2
Parts and service sales | U.S.        
Disaggregation of Revenue        
Total revenues 453.8 353.1 1,307.7 982.0
Parts and service sales | U.K.        
Disaggregation of Revenue        
Total revenues 61.8 63.4 183.4 170.2
Finance, insurance and other, net        
Disaggregation of Revenue        
Total revenues 186.3 146.0 549.5 431.3
Variable consideration recognized relating to performance obligations satisfied in previous period 5.3 5.1 22.2 18.7
Finance, insurance and other, net | U.S.        
Disaggregation of Revenue        
Total revenues 170.2 130.5 498.1 389.4
Finance, insurance and other, net | U.K.        
Disaggregation of Revenue        
Total revenues $ 16.1 $ 15.6 $ 51.4 $ 41.9