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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue        
Total revenues $ 5,782.7 $ 5,221.4 $ 16,991.5 $ 14,388.3
U.S.        
Disaggregation of Revenue        
Total revenues 4,277.9 3,971.1 12,376.9 11,538.0
U.K.        
Disaggregation of Revenue        
Total revenues 1,504.8 1,250.3 4,614.6 2,850.2
Total new and used vehicle sales        
Disaggregation of Revenue        
Total revenues 4,807.9 4,347.3 14,142.3 11,974.4
Total new and used vehicle sales | U.S.        
Disaggregation of Revenue        
Total revenues 3,508.3 3,258.0 10,136.0 9,477.1
Total new and used vehicle sales | U.K.        
Disaggregation of Revenue        
Total revenues 1,299.6 1,089.2 4,006.3 2,497.2
New vehicle retail sales        
Disaggregation of Revenue        
Total revenues 2,807.4 2,567.6 8,222.8 7,114.3
New vehicle retail sales | U.S.        
Disaggregation of Revenue        
Total revenues 2,187.0 2,016.8 6,288.7 5,826.2
New vehicle retail sales | U.K.        
Disaggregation of Revenue        
Total revenues 620.4 550.7 1,934.1 1,288.2
Used vehicle retail sales        
Disaggregation of Revenue        
Total revenues 1,852.1 1,656.5 5,455.7 4,526.5
Used vehicle retail sales | U.S.        
Disaggregation of Revenue        
Total revenues 1,230.4 1,158.4 3,577.9 3,409.7
Used vehicle retail sales | U.K.        
Disaggregation of Revenue        
Total revenues 621.8 498.2 1,877.8 1,116.7
Used vehicle wholesale sales        
Disaggregation of Revenue        
Total revenues 148.4 123.2 463.8 333.5
Used vehicle wholesale sales | U.S.        
Disaggregation of Revenue        
Total revenues 90.9 82.9 269.4 241.2
Used vehicle wholesale sales | U.K.        
Disaggregation of Revenue        
Total revenues 57.5 40.3 194.4 92.3
Parts and service sales        
Disaggregation of Revenue        
Total revenues 733.9 660.0 2,144.4 1,810.8
Parts and service sales | U.S.        
Disaggregation of Revenue        
Total revenues 567.6 528.4 1,654.4 1,521.0
Parts and service sales | U.K.        
Disaggregation of Revenue        
Total revenues 166.3 131.6 490.0 289.8
Finance, insurance and other, net        
Disaggregation of Revenue        
Total revenues 240.9 214.1 704.8 603.1
Variable consideration recognized 8.5 6.8 23.9 24.8
Finance, insurance and other, net | U.S.        
Disaggregation of Revenue        
Total revenues 202.1 184.6 586.5 539.9
Finance, insurance and other, net | U.K.        
Disaggregation of Revenue        
Total revenues $ 38.8 $ 29.4 $ 118.3 $ 63.2