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REVENUES - Revenues Disaggregated by Revenue Source and Geographical Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disaggregation of Revenue    
Total revenues $ 4,130.0 $ 3,844.4
U.S.    
Disaggregation of Revenue    
Total revenues 3,342.4 3,091.3
U.K.    
Disaggregation of Revenue    
Total revenues 787.7 753.0
Total new and used vehicle sales    
Disaggregation of Revenue    
Total revenues 3,416.6 3,198.5
Total new and used vehicle sales | U.S.    
Disaggregation of Revenue    
Total revenues 2,721.0 2,528.2
Total new and used vehicle sales | U.K.    
Disaggregation of Revenue    
Total revenues 695.6 670.3
New vehicle retail sales    
Disaggregation of Revenue    
Total revenues 1,955.7 1,745.1
New vehicle retail sales | U.S.    
Disaggregation of Revenue    
Total revenues 1,608.6 1,433.1
New vehicle retail sales | U.K.    
Disaggregation of Revenue    
Total revenues 347.1 312.0
Used vehicle retail sales    
Disaggregation of Revenue    
Total revenues 1,348.9 1,359.9
Used vehicle retail sales | U.S.    
Disaggregation of Revenue    
Total revenues 1,030.1 1,037.9
Used vehicle retail sales | U.K.    
Disaggregation of Revenue    
Total revenues 318.8 322.0
Used vehicle wholesale sales    
Disaggregation of Revenue    
Total revenues 112.0 93.5
Used vehicle wholesale sales | U.S.    
Disaggregation of Revenue    
Total revenues 82.4 57.2
Used vehicle wholesale sales | U.K.    
Disaggregation of Revenue    
Total revenues 29.6 36.3
Parts and service sales    
Disaggregation of Revenue    
Total revenues 548.3 472.9
Parts and service sales | U.S.    
Disaggregation of Revenue    
Total revenues 473.8 408.4
Parts and service sales | U.K.    
Disaggregation of Revenue    
Total revenues 74.6 64.5
Finance, insurance and other, net    
Disaggregation of Revenue    
Total revenues 165.1 173.0
Variable consideration recognized relating to performance obligations satisfied in previous period 4.9 10.1
Finance, insurance and other, net | U.S.    
Disaggregation of Revenue    
Total revenues 147.6 154.7
Finance, insurance and other, net | U.K.    
Disaggregation of Revenue    
Total revenues $ 17.5 $ 18.3