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REVENUES - Revenues Disaggregated by Revenue Source and Geographical Segments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue |  |  |
Revenues | $ 19,934.3 | $ 17,873.7 | $ 16,222.1
Variable consideration recognized | 30.6 |  |
U.S. |  |  |
Disaggregation of Revenue |  |  |
Revenues | 15,772.9 | 14,814.2 | 13,427.1
U.K. |  |  |
Disaggregation of Revenue |  |  |
Revenues | 4,161.5 | 3,059.5 | 2,795.1
Total new and used vehicle sales |  |  |
Disaggregation of Revenue |  |  |
Revenues | 16,614.7 | 14,909.5 | 13,490.4
Total new and used vehicle sales | U.S. |  |  |
Disaggregation of Revenue |  |  |
Revenues | 12,984.6 | 12,206.6 | 11,008.8
Total new and used vehicle sales | U.K. |  |  |
Disaggregation of Revenue |  |  |
Revenues | 3,630.1 | 2,702.9 | 2,481.6
New vehicle retail sales |  |  |
Disaggregation of Revenue |  |  |
Revenues | 9,972.4 | 8,774.6 | 7,452.5
New vehicle retail sales | U.S. |  |  |
Disaggregation of Revenue |  |  |
Revenues | 8,110.1 | 7,433.6 | 6,238.5
New vehicle retail sales | U.K. |  |  |
Disaggregation of Revenue |  |  |
Revenues | 1,862.3 | 1,341.0 | 1,214.0
Used vehicle retail sales |  |  |
Disaggregation of Revenue |  |  |
Revenues | 6,179.9 | 5,693.5 | 5,673.3
Used vehicle retail sales | U.S. |  |  |
Disaggregation of Revenue |  |  |
Revenues | 4,550.7 | 4,458.7 | 4,531.5
Used vehicle retail sales | U.K. |  |  |
Disaggregation of Revenue |  |  |
Revenues | 1,629.2 | 1,234.8 | 1,141.8
Used vehicle wholesale sales |  |  |
Disaggregation of Revenue |  |  |
Revenues | 462.4 | 441.4 | 364.6
Used vehicle wholesale sales | U.S. |  |  |
Disaggregation of Revenue |  |  |
Revenues | 323.8 | 314.4 | 238.8
Used vehicle wholesale sales | U.K. |  |  |
Disaggregation of Revenue |  |  |
Revenues | 138.6 | 127.1 | 125.8
Parts and service sales |  |  |
Disaggregation of Revenue |  |  |
Revenues | 2,491.0 | 2,222.3 | 2,009.5
Parts and service sales | U.S. |  |  |
Disaggregation of Revenue |  |  |
Revenues | 2,052.7 | 1,933.3 | 1,761.4
Parts and service sales | U.K. |  |  |
Disaggregation of Revenue |  |  |
Revenues | 438.3 | 289.0 | 248.2
Finance, insurance and other, net |  |  |
Disaggregation of Revenue |  |  |
Revenues | 828.7 | 741.9 | 722.2
Variable consideration recognized | 30.6 | 24.1 | 30.8
Finance, insurance and other, net | U.S. |  |  |
Disaggregation of Revenue |  |  |
Revenues | 735.6 | 674.3 | 656.9
Finance, insurance and other, net | U.K. |  |  |
Disaggregation of Revenue |  |  |
Revenues | $ 93.0 | $ 67.6 | $ 65.2

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