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REVENUES - Revenues Disaggregated by Revenue Source and Geographical Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation of Revenue        
Total revenues $ 4,558.5 $ 4,145.4 $ 8,688.5 $ 7,989.7
U.S.        
Disaggregation of Revenue        
Total revenues 3,799.6 3,437.2 7,142.0 6,528.5
U.K.        
Disaggregation of Revenue        
Total revenues 758.9 708.2 1,546.5 1,461.2
Total new and used vehicle sales        
Disaggregation of Revenue        
Total revenues 3,806.2 3,452.5 7,222.8 6,651.0
Total new and used vehicle sales | U.S.        
Disaggregation of Revenue        
Total revenues 3,135.2 2,818.5 5,856.2 5,346.7
Total new and used vehicle sales | U.K.        
Disaggregation of Revenue        
Total revenues 671.0 634.0 1,366.6 1,304.3
New vehicle retail sales        
Disaggregation of Revenue        
Total revenues 2,243.2 1,851.3 4,198.9 3,596.4
New vehicle retail sales | U.S.        
Disaggregation of Revenue        
Total revenues 1,915.5 1,561.7 3,524.1 2,994.9
New vehicle retail sales | U.K.        
Disaggregation of Revenue        
Total revenues 327.6 289.5 674.8 601.6
Used vehicle retail sales        
Disaggregation of Revenue        
Total revenues 1,450.6 1,505.4 2,799.5 2,865.3
Used vehicle retail sales | U.S.        
Disaggregation of Revenue        
Total revenues 1,139.9 1,197.6 2,170.0 2,235.5
Used vehicle retail sales | U.K.        
Disaggregation of Revenue        
Total revenues 310.7 307.8 629.5 629.8
Used vehicle wholesale sales        
Disaggregation of Revenue        
Total revenues 112.5 95.8 224.4 189.3
Used vehicle wholesale sales | U.S.        
Disaggregation of Revenue        
Total revenues 79.8 59.1 162.1 116.4
Used vehicle wholesale sales | U.K.        
Disaggregation of Revenue        
Total revenues 32.7 36.7 62.3 72.9
Parts and service sales        
Disaggregation of Revenue        
Total revenues 562.0 502.6 1,110.3 975.5
Parts and service sales | U.S.        
Disaggregation of Revenue        
Total revenues 491.2 445.6 965.0 854.0
Parts and service sales | U.K.        
Disaggregation of Revenue        
Total revenues 70.8 57.1 145.3 121.5
Finance, insurance and other, net        
Disaggregation of Revenue        
Total revenues 190.3 190.2 355.4 363.2
Variable consideration recognized relating to performance obligations satisfied in previous period 7.6 6.8 12.5 16.9
Finance, insurance and other, net | U.S.        
Disaggregation of Revenue        
Total revenues 173.2 173.1 320.8 327.9
Finance, insurance and other, net | U.K.        
Disaggregation of Revenue        
Total revenues $ 17.1 $ 17.1 $ 34.6 $ 35.4