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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Revenue        
Total revenues $ 4,145.4 $ 3,625.6 $ 7,989.7 $ 6,579.6
U.S.        
Disaggregation of Revenue        
Total revenues 3,437.2 2,924.9 6,528.5 5,329.3
U.K.        
Disaggregation of Revenue        
Total revenues 708.2 700.7 1,461.2 1,250.3
Total new and used vehicle sales        
Disaggregation of Revenue        
Total revenues 3,452.5 3,083.0 6,651.0 5,558.6
Total new and used vehicle sales | U.S.        
Disaggregation of Revenue        
Total revenues 2,818.5 2,448.4 5,346.7 4,441.4
Total new and used vehicle sales | U.K.        
Disaggregation of Revenue        
Total revenues 634.0 634.6 1,304.3 1,117.2
New vehicle retail sales        
Disaggregation of Revenue        
Total revenues 1,851.3 1,805.5 3,596.4 3,314.7
New vehicle retail sales | U.S.        
Disaggregation of Revenue        
Total revenues 1,561.7 1,504.4 2,994.9 2,750.4
New vehicle retail sales | U.K.        
Disaggregation of Revenue        
Total revenues 289.5 301.2 601.6 564.3
Used vehicle retail sales        
Disaggregation of Revenue        
Total revenues 1,505.4 1,183.8 2,865.3 2,071.9
Used vehicle retail sales | U.S.        
Disaggregation of Revenue        
Total revenues 1,197.6 882.9 2,235.5 1,579.4
Used vehicle retail sales | U.K.        
Disaggregation of Revenue        
Total revenues 307.8 300.9 629.8 492.5
Used vehicle wholesale sales        
Disaggregation of Revenue        
Total revenues 95.8 93.7 189.3 172.0
Used vehicle wholesale sales | U.S.        
Disaggregation of Revenue        
Total revenues 59.1 61.2 116.4 111.6
Used vehicle wholesale sales | U.K.        
Disaggregation of Revenue        
Total revenues 36.7 32.5 72.9 60.4
Parts and service sales        
Disaggregation of Revenue        
Total revenues 502.6 382.9 975.5 735.7
Parts and service sales | U.S.        
Disaggregation of Revenue        
Total revenues 445.6 332.6 854.0 628.9
Parts and service sales | U.K.        
Disaggregation of Revenue        
Total revenues 57.1 50.3 121.5 106.8
Finance, insurance and other, net        
Disaggregation of Revenue        
Total revenues 190.2 159.6 363.2 285.3
Variable consideration recognized relating to performance obligations satisfied in previous period 6.8 7.7 16.9 13.7
Finance, insurance and other, net | U.S.        
Disaggregation of Revenue        
Total revenues 173.1 143.9 327.9 259.0
Finance, insurance and other, net | U.K.        
Disaggregation of Revenue        
Total revenues $ 17.1 $ 15.7 $ 35.4 $ 26.3