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REVENUES - Schedule of Revenues Disaggregated by Revenue Source and Geographical Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Revenue    
Total revenues $ 5,505.3 $ 4,470.5
U.S.    
Disaggregation of Revenue    
Total revenues 3,921.8 3,645.7
U.K.    
Disaggregation of Revenue    
Total revenues 1,583.5 824.8
Total new and used vehicle sales    
Disaggregation of Revenue    
Total revenues 4,587.0 3,705.4
Total new and used vehicle sales | U.S.    
Disaggregation of Revenue    
Total revenues 3,205.0 2,979.2
Total new and used vehicle sales | U.K.    
Disaggregation of Revenue    
Total revenues 1,381.9 726.2
New vehicle retail sales    
Disaggregation of Revenue    
Total revenues 2,680.0 2,182.6
New vehicle retail sales | U.S.    
Disaggregation of Revenue    
Total revenues 1,968.7 1,799.8
New vehicle retail sales | U.K.    
Disaggregation of Revenue    
Total revenues 711.2 382.8
Used vehicle retail sales    
Disaggregation of Revenue    
Total revenues 1,755.4 1,416.8
Used vehicle retail sales | U.S.    
Disaggregation of Revenue    
Total revenues 1,144.3 1,099.5
Used vehicle retail sales | U.K.    
Disaggregation of Revenue    
Total revenues 611.1 317.3
Used vehicle wholesale sales    
Disaggregation of Revenue    
Total revenues 151.6 106.0
Used vehicle wholesale sales | U.S.    
Disaggregation of Revenue    
Total revenues 92.0 79.9
Used vehicle wholesale sales | U.K.    
Disaggregation of Revenue    
Total revenues 59.6 26.2
Parts and service sales    
Disaggregation of Revenue    
Total revenues 692.1 576.2
Parts and service sales | U.S.    
Disaggregation of Revenue    
Total revenues 531.3 495.1
Parts and service sales | U.K.    
Disaggregation of Revenue    
Total revenues 160.8 81.1
Finance, insurance and other, net    
Disaggregation of Revenue    
Total revenues 226.2 188.9
Variable consideration recognized 10.4 12.4
Finance, insurance and other, net | U.S.    
Disaggregation of Revenue    
Total revenues 185.5 171.4
Finance, insurance and other, net | U.K.    
Disaggregation of Revenue    
Total revenues $ 40.8 $ 17.5