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SEGMENT INFORMATION - Reportable Segment Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information      
Total revenues $ 17,873.7 $ 16,222.1 $ 13,481.9
Gross profit 3,020.3 2,965.2 2,440.7
SG&A expenses 1,926.8 1,783.3 1,477.2
Depreciation and amortization expense 92.0 88.4 77.4
Floorplan interest expense 64.1 27.3 27.6
Other interest expense, net 99.8 77.5 55.8
Income before income taxes 800.2 985.3 800.9
Real estate related capital expenditures 46.3 39.6 45.9
Non-real estate related capital expenditures 139.2 115.5 96.2
Total capital expenditures 185.4 155.1 142.1
U.S.      
Segment Reporting Information      
Total revenues 14,814.2 13,427.1 10,846.3
Gross profit 2,610.1 2,582.3 2,089.5
SG&A expenses 1,622.9 1,516.9 1,234.9
Depreciation and amortization expense 76.9 73.1 60.4
Floorplan interest expense 53.5 21.4 22.2
Other interest expense, net 91.4 71.0 48.5
Income before income taxes 732.1 897.4 721.8
Real estate related capital expenditures 41.5 17.7 18.9
Non-real estate related capital expenditures 114.6 100.2 82.3
Total capital expenditures 156.2 117.8 101.2
U.K.      
Segment Reporting Information      
Total revenues 3,059.5 2,795.1 2,635.6
Gross profit 410.1 382.9 351.2
SG&A expenses 303.9 266.5 242.2
Depreciation and amortization expense 15.1 15.2 17.0
Floorplan interest expense 10.6 5.9 5.4
Other interest expense, net 8.4 6.6 7.3
Income before income taxes 68.1 87.9 79.2
Real estate related capital expenditures 4.7 22.0 27.0
Non-real estate related capital expenditures 24.5 15.3 13.9
Total capital expenditures $ 29.3 $ 37.3 $ 40.9