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REVENUES - Schedule of Revenues Disaggregated by Revenue Source and Geographical Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue        
Total revenues $ 5,221.4 $ 4,705.1 $ 14,388.3 $ 13,393.7
U.S.        
Disaggregation of Revenue        
Total revenues 3,971.1 3,899.7 11,538.0 11,041.7
U.K.        
Disaggregation of Revenue        
Total revenues 1,250.3 805.5 2,850.2 2,352.0
Total new and used vehicle sales        
Disaggregation of Revenue        
Total revenues 4,347.3 3,938.8 11,974.4 11,161.6
Total new and used vehicle sales | U.S.        
Disaggregation of Revenue        
Total revenues 3,258.0 3,223.8 9,477.1 9,080.0
Total new and used vehicle sales | U.K.        
Disaggregation of Revenue        
Total revenues 1,089.2 715.0 2,497.2 2,081.7
New vehicle retail sales        
Disaggregation of Revenue        
Total revenues 2,567.6 2,264.5 7,114.3 6,463.4
New vehicle retail sales | U.S.        
Disaggregation of Revenue        
Total revenues 2,016.8 1,920.2 5,826.2 5,444.3
New vehicle retail sales | U.K.        
Disaggregation of Revenue        
Total revenues 550.7 344.4 1,288.2 1,019.1
Used vehicle retail sales        
Disaggregation of Revenue        
Total revenues 1,656.5 1,559.6 4,526.5 4,359.0
Used vehicle retail sales | U.S.        
Disaggregation of Revenue        
Total revenues 1,158.4 1,223.5 3,409.7 3,393.5
Used vehicle retail sales | U.K.        
Disaggregation of Revenue        
Total revenues 498.2 336.1 1,116.7 965.6
Used vehicle wholesale sales        
Disaggregation of Revenue        
Total revenues 123.2 114.7 333.5 339.2
Used vehicle wholesale sales | U.S.        
Disaggregation of Revenue        
Total revenues 82.9 80.1 241.2 242.2
Used vehicle wholesale sales | U.K.        
Disaggregation of Revenue        
Total revenues 40.3 34.6 92.3 96.9
Parts and service sales        
Disaggregation of Revenue        
Total revenues 660.0 566.9 1,810.8 1,677.3
Parts and service sales | U.S.        
Disaggregation of Revenue        
Total revenues 528.4 494.4 1,521.0 1,459.4
Parts and service sales | U.K.        
Disaggregation of Revenue        
Total revenues 131.6 72.5 289.8 217.9
Finance, insurance and other, net        
Disaggregation of Revenue        
Total revenues 214.1 199.4 603.1 554.8
Variable consideration recognized relating to performance obligations satisfied in previous period 6.8 7.2 24.8 19.7
Finance, insurance and other, net | U.S.        
Disaggregation of Revenue        
Total revenues 184.6 181.5 539.9 502.3
Finance, insurance and other, net | U.K.        
Disaggregation of Revenue        
Total revenues $ 29.4 $ 17.9 $ 63.2 $ 52.5