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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

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