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REVENUES - Schedule of Revenues Disaggregated by Revenue Source and Geographical Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue        
Total revenues $ 4,696.4 $ 4,558.5 $ 9,166.9 $ 8,688.5
U.S.        
Disaggregation of Revenue        
Total revenues 3,921.2 3,799.6 7,566.9 7,142.0
U.K.        
Disaggregation of Revenue        
Total revenues 775.2 758.9 1,600.0 1,546.5
Total new and used vehicle sales        
Disaggregation of Revenue        
Total revenues 3,921.7 3,806.2 7,627.1 7,222.8
Total new and used vehicle sales | U.S.        
Disaggregation of Revenue        
Total revenues 3,239.9 3,135.2 6,219.1 5,856.2
Total new and used vehicle sales | U.K.        
Disaggregation of Revenue        
Total revenues 681.8 671.0 1,408.0 1,366.6
New vehicle retail sales        
Disaggregation of Revenue        
Total revenues 2,364.2 2,243.2 4,546.8 4,198.9
New vehicle retail sales | U.S.        
Disaggregation of Revenue        
Total revenues 2,009.5 1,915.5 3,809.4 3,524.1
New vehicle retail sales | U.K.        
Disaggregation of Revenue        
Total revenues 354.6 327.6 737.4 674.8
Used vehicle retail sales        
Disaggregation of Revenue        
Total revenues 1,453.2 1,450.6 2,870.0 2,799.5
Used vehicle retail sales | U.S.        
Disaggregation of Revenue        
Total revenues 1,151.9 1,139.9 2,251.4 2,170.0
Used vehicle retail sales | U.K.        
Disaggregation of Revenue        
Total revenues 301.3 310.7 618.6 629.5
Used vehicle wholesale sales        
Disaggregation of Revenue        
Total revenues 104.3 112.5 210.3 224.4
Used vehicle wholesale sales | U.S.        
Disaggregation of Revenue        
Total revenues 78.4 79.8 158.3 162.1
Used vehicle wholesale sales | U.K.        
Disaggregation of Revenue        
Total revenues 25.9 32.7 52.0 62.3
Parts and service sales        
Disaggregation of Revenue        
Total revenues 574.5 562.0 1,150.8 1,110.3
Parts and service sales | U.S.        
Disaggregation of Revenue        
Total revenues 497.4 491.2 992.6 965.0
Parts and service sales | U.K.        
Disaggregation of Revenue        
Total revenues 77.1 70.8 158.2 145.3
Finance, insurance and other, net        
Disaggregation of Revenue        
Total revenues 200.1 190.3 389.0 355.4
Variable consideration recognized relating to performance obligations satisfied in previous period 5.6 7.6 18.0 12.5
Finance, insurance and other, net | U.S.        
Disaggregation of Revenue        
Total revenues 183.9 173.2 355.2 320.8
Finance, insurance and other, net | U.K.        
Disaggregation of Revenue        
Total revenues $ 16.3 $ 17.1 $ 33.8 $ 34.6